Method for producing glutathione

文档序号：788896 发布日期：2021-04-09 浏览：37次中文

阅读说明：本技术 谷胱甘肽的制造方法 (Method for producing glutathione ) 是由岩本裕一岩崎晃加藤祐章于 2019-09-03 设计创作，主要内容包括：本发明的目的在于提供基于酵母制造谷胱甘肽的廉价且高效的制造方法。本发明提供以将酵母在碱性氨基酸浓度为0.8g/L以上的培养基中进行培养为特征的谷胱甘肽的制造方法、以及促进基于酵母的谷胱甘肽的生产的方法。(The purpose of the present invention is to provide a method for producing glutathione using yeast at low cost and high efficiency. The present invention provides a method for producing glutathione, characterized by culturing yeast in a medium having a basic amino acid concentration of 0.8g/L or more, and a method for promoting the production of glutathione by yeast.)

1. A method for producing glutathione, comprising:

the yeast is cultured in a medium having a basic amino acid concentration of 0.8g/L or more.

2. The method according to claim 1, wherein the yeast contains reduced glutathione and oxidized glutathione, and the weight of oxidized glutathione is 20 or more, assuming that the weight of reduced glutathione is 100.

3. The method according to claim 1 or 2, wherein the yeast is a yeast having a reduced glutathione reductase activity compared to the parent strain.

4. The method according to any one of claims 1 to 3, wherein the yeast is deficient in a gene encoding glutathione reductase.

5. The method according to claim 3 or 4, wherein the glutathione reductase is selected from the following (1a) to (1 e):

(1a) a protein having an amino acid sequence represented by SEQ ID NO. 1;

(1b) a protein having glutathione reductase activity, which comprises an amino acid sequence in which 1 or more amino acids in the amino acid sequence represented by SEQ ID NO. 1 are deleted, substituted, inserted and/or added;

(1c) a protein which is composed of an amino acid sequence having a sequence identity of 60% or more to the amino acid sequence represented by SEQ ID NO. 1 and has glutathione reductase activity;

(1d) a protein having glutathione reductase activity, which comprises an amino acid sequence encoded by a DNA that hybridizes under stringent conditions to a DNA having a base sequence complementary to SEQ ID NO. 2; and

(1e) a protein having glutathione reductase activity, which comprises an amino acid sequence encoded by DNA having 1 or more nucleotides of the nucleotide sequence shown in SEQ ID NO. 2 substituted, deleted, inserted and/or added.

6. The method according to any one of claims 1 to 5, wherein the yeast has an increased activity of gamma-glutamylcysteine synthetase and/or glutathione synthetase as compared with that of the parent strain.

7. The method according to any one of claims 1 to 6, wherein the yeast is a yeast obtained by transforming a DNA comprising a base sequence encoding γ -glutamylcysteine synthetase and/or a DNA comprising a base sequence encoding glutathione synthetase.

8. The method according to claim 6 or 7, wherein the γ -glutamylcysteine synthetase is selected from the following (2a) to (2 e):

(2a) a protein having an amino acid sequence represented by SEQ ID No. 3;

(2b) a protein having γ -glutamylcysteine synthetase activity, which comprises an amino acid sequence in which 1 or more amino acids in the amino acid sequence represented by SEQ ID NO. 3 are deleted, substituted, inserted and/or added;

(2c) a protein which is composed of an amino acid sequence having a sequence identity of 60% or more to the amino acid sequence represented by SEQ ID No. 3 and has a gamma-glutamylcysteine synthetase activity;

(2d) a protein having γ -glutamylcysteine synthetase activity, which comprises an amino acid sequence encoded by a DNA that hybridizes under stringent conditions to a DNA having a nucleotide sequence complementary to SEQ ID NO. 4; and

(2e) a protein having γ -glutamylcysteine synthetase activity, which comprises an amino acid sequence encoded by DNA having a nucleotide sequence represented by SEQ ID NO. 4 in which 1 or more nucleotides are substituted, deleted, inserted and/or added.

9. The method according to claim 6 or 7, wherein the glutathione synthetase is selected from the following (3a) to (3 e):

(3a) a protein having an amino acid sequence represented by SEQ ID No. 5;

(3b) a protein having glutathione synthetase activity, which comprises an amino acid sequence in which 1 or more amino acids in the amino acid sequence represented by SEQ ID NO.5 are deleted, substituted, inserted and/or added;

(3c) a protein which is composed of an amino acid sequence having a sequence identity of 60% or more to the amino acid sequence represented by SEQ ID No.5 and has glutathione synthetase activity;

(3d) a protein having glutathione synthetase activity, which comprises an amino acid sequence encoded by a DNA that hybridizes under stringent conditions to a DNA having a base sequence complementary to SEQ ID NO. 6; and

(3e) a protein having glutathione synthetase activity, which comprises an amino acid sequence encoded by DNA having a nucleotide sequence represented by SEQ ID NO. 6 in which 1 or more nucleotides are substituted, deleted, inserted and/or added.

10. The method according to any one of claims 1 to 9, wherein the yeast is a yeast having an enhanced glutathione transporting enzyme activity as compared to the parent strain.

11. The method according to any one of claims 1 to 10, wherein the yeast is a yeast obtained by transformation with a DNA comprising a base sequence encoding a glutathione transporting enzyme.

12. The method according to claim 10 or 11, wherein the glutathione transporting enzyme is selected from the following (4a) to (4 e):

(4a) a protein having an amino acid sequence represented by SEQ ID NO. 7;

(4b) a protein having glutathione transporting enzyme activity, which comprises an amino acid sequence in which 1 or more amino acids in the amino acid sequence represented by SEQ ID NO. 7 are deleted, substituted, inserted and/or added;

(4c) a protein which is composed of an amino acid sequence having a sequence identity of 60% or more to the amino acid sequence represented by SEQ ID NO. 7 and has glutathione transferase activity;

(4d) a protein having glutathione transporting enzyme activity, which comprises an amino acid sequence encoded by a DNA that hybridizes under stringent conditions to a DNA having a base sequence complementary to SEQ ID NO. 8; and

(4e) a protein having glutathione transferase activity, which comprises an amino acid sequence encoded by DNA having 1 or more nucleotides of the nucleotide sequence shown in SEQ ID NO. 8 substituted, deleted, inserted and/or added.

13. The method according to any one of claims 1 to 12, wherein the yeast is of the genus saccharomyces, candida, or pichia.

14. The method according to any one of claims 1 to 13, wherein the yeast is a yeast that is not auxotrophic for a basic amino acid.

15. The method of any one of claims 1 to 14, wherein the culture medium comprises molasses as a carbon source.

16. The method according to any one of claims 1 to 15, wherein the concentration of the basic amino acid in the medium at the start of the culture is 0.8g/L or more.

17. The method according to any one of claims 1 to 16, wherein the concentration of the basic amino acid in the medium is 2g/L or more.

18. The method according to any one of claims 1 to 16, wherein the concentration of the basic amino acid in the medium is 4g/L or more.

19. The method of any one of claims 1 to 18, wherein the basic amino acid is lysine.

20. A method of promoting yeast-based glutathione production, comprising:

the yeast is cultured in a medium having a basic amino acid concentration of 0.8g/L or more.

21. An accelerator for yeast-based production of glutathione, comprising a basic amino acid.

22. A culture medium composition for yeast, wherein the concentration of basic amino acid is 0.8g/L or more, and molasses is used as a carbon source.

Technical Field

The present invention relates to a method for producing glutathione by yeast, a method for promoting the production of glutathione by yeast, a promoter for the production of glutathione by yeast, and a medium composition suitable for the production of glutathione by yeast.

Background

Yeasts belonging to the genus Saccharomyces (Saccharomyces) such as brewer's yeast and baker's yeast contain natural vitamin B group, amino acids, minerals, and the like in a well-balanced manner, and are effectively utilized in the production of beer and bread. For example, dry yeast has been used in japan for a long time as a pharmaceutical product, a food material, a seasoning, and the like, and is considered as a material having high nutritional value and safety. In recent years, yeast has also been widely used as a raw material for yeast extracts.

Yeast extracts are prepared from yeast cultures, contain abundant amino acids and the like, and have been used as food additives such as seasonings for imparting umami taste and richness. In particular, since there is a recent tendency to favor nature, the demand for yeast extracts as seasonings tends to increase. Since a yeast extract prepared from yeast containing a large amount of taste components is expected to be used as a more excellent seasoning, development of yeast containing a large amount of taste components has been actively conducted.

As representative sulfur-containing compounds in yeast cells, glutathione and S-adenosylmethionine are exemplified. In general, glutathione is a tripeptide widely distributed in yeast and animal livers, and is a substance that is closely related to an oxidation-reduction reaction in the living body, and is a very useful substance as a substance that exerts important functions such as a liver function restoration action, a detoxification action, and an action of preventing cell aging by scavenging active oxygen. As forms of glutathione, there are reduced glutathione (hereinafter, abbreviated as GSH) and oxidized glutathione (hereinafter, abbreviated as GSSG) in which 2 reduced glutathione residues are disulfide-bonded to each other through cysteine residues. Both of them are biosynthesized in vivo and play an important role in redox reactions. GSSG is transiently converted into GSH by glutathione reductase in the body and functions while circulating. Therefore, it is expected that GSSG will have the same effect as GSH when administered (for example, Journal of Nutritional Science and vitality, Vol. 44, p. 613, 1998, etc.).

In general, sulfur-containing compounds are synthesized by using sulfur-containing amino acids such as methionine and cysteine, and transferring and translating products of a plurality of genes represented by the MET gene (methionine synthesis gene) group. Therefore, in order to obtain a yeast with a higher sulfur compound production, attempts have been widely made to produce a yeast mutant strain containing a large amount of sulfur compounds by mutating genes related to the synthesis of sulfur compounds, which are possessed by yeast. For example, as a method for producing a yeast containing a large amount of glutathione, an attempt to improve productivity by increasing the glutathione content in cultured bacteria has been made in the following manner: performing mutation treatment on a yeast used for glutathione production (patent documents 1 to 3), and introducing an enzyme involved in glutathione synthesis by gene recombination (patent documents 4 to 8); and adding L-glutamic acid, L-cysteine, and glycine, which are 3 kinds of amino acids constituting glutathione, to the medium (patent documents 9 to 12).

Patent document 13 discloses a method for producing glutathione by a fermentation method, the method including: a methionine and L-lysine auxotrophic microorganism belonging to the genus Candida or Brettanomyces is cultured in a medium containing methionine and lysine. Patent document 13 describes a medium containing 200 to 500. mu.g/mL of methionine and 300 to 750. mu.g/mL of L-lysine as a medium containing methionine and lysine.

On the other hand, patent document 14 describes a medium for yeast, which is a medium for imparting to yeast the growth ability of the same level as or higher than that of a YPD medium, the medium containing sugars as a carbon source, amino acids as a nitrogen source, vitamins, inositol, zinc ions, potassium ions, and magnesium ions, and having an inositol concentration of 50 to 100 mg/L.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 59-151894

Patent document 2: japanese examined patent publication (examined patent publication) No. 03-18872

Patent document 3: japanese laid-open patent publication No. 10-191963

Patent document 4: japanese patent laid-open publication No. 61-52299

Patent document 5: japanese laid-open patent publication No. 62-275685

Patent document 6: japanese laid-open patent publication No. 63-129985

Patent document 7: japanese laid-open patent publication No. 64-51098

Patent document 8: japanese laid-open patent publication No. 4-179484

Patent document 9: japanese patent laid-open No. Sho 47-16990

Patent document 10: japanese laid-open patent publication No. Sho 48-92579

Patent document 11: japanese laid-open patent publication No. 51-139686

Patent document 12: japanese laid-open patent publication No. 53-94089

Patent document 13: japanese laid-open patent publication No. Sho 48-61689

Patent document 14: WO2014/030774

Disclosure of Invention

Problems to be solved by the invention

In order to industrially mass-produce glutathione itself, a glutathione-rich yeast extract, and the like at a lower cost and with high efficiency, it is important to use a yeast having a high glutathione content. Although a yeast containing a large amount of glutathione can be obtained by a method of screening a yeast having a higher glutathione content from a yeast genetically modified by mutation treatment or the like, as in the method described in patent document 1, it takes time and effort to perform mutation treatment and screening, and in many cases, a yeast containing a large amount of glutathione is not necessarily obtained.

The present invention provides an inexpensive and efficient method for improving the productivity of yeast-based glutathione.

Means for solving the problems

The present inventors have conducted extensive studies to solve the above problems, and as a result, have found that when a yeast such as a yeast belonging to the genus Saccharomyces is cultured, the glutathione content of the yeast can be increased by adding a given amount or more of a basic amino acid such as lysine to the culture medium, and glutathione can be efficiently produced, thereby completing the present invention.

That is, the present invention includes the following inventions.

[1] A method for producing glutathione, comprising:

the yeast is cultured in a medium having a basic amino acid concentration of 0.8g/L or more.

[2] The method according to [1], wherein the yeast contains reduced glutathione and oxidized glutathione, and the weight of the oxidized glutathione is 20 or more, assuming that the weight of the reduced glutathione is 100.

[3] The method according to [1] or [2], wherein the yeast is a yeast having a reduced glutathione reductase activity as compared with a parent strain.

[4] The method according to any one of [1] to [3], wherein the yeast is deficient in a gene encoding glutathione reductase.

[5] The method according to [3] or [4], wherein the glutathione reductase is selected from the following (1a) to (1 e):

(1a) a protein comprising the amino acid sequence shown in SEQ ID NO. 1,

(1b) A protein having glutathione reductase activity which comprises an amino acid sequence in which 1 or more amino acids in the amino acid sequence represented by SEQ ID NO. 1 are deleted, substituted, inserted and/or added,

(1c) A protein which comprises an amino acid sequence having 60% or more sequence identity to the amino acid sequence represented by SEQ ID NO. 1 and has glutathione reductase activity,

(1d) A protein having glutathione reductase activity, which comprises an amino acid sequence encoded by DNA that hybridizes under stringent conditions to DNA having a base sequence complementary to SEQ ID NO. 2, and,

(1e) A protein having glutathione reductase activity, which comprises an amino acid sequence encoded by DNA having 1 or more nucleotides of the nucleotide sequence shown in SEQ ID NO. 2 substituted, deleted, inserted and/or added.

[6] The method according to any one of [1] to [5], wherein the yeast has an enhanced γ -glutamylcysteine synthetase and/or glutathione synthetase activity as compared with that of the parent strain.

[7] The method according to any one of [1] to [6], wherein the yeast is a yeast obtained by transforming a DNA comprising a nucleotide sequence encoding γ -glutamylcysteine synthetase and/or a DNA comprising a nucleotide sequence encoding glutathione synthetase.

[8] The method according to [6] or [7], wherein the γ -glutamylcysteine synthetase is selected from the following (2a) to (2 e):

(2a) a protein comprising the amino acid sequence shown in SEQ ID No. 3,

(2b) A protein comprising an amino acid sequence in which 1 or more amino acids in the amino acid sequence represented by SEQ ID No. 3 are deleted, substituted, inserted and/or added, and having a gamma-glutamylcysteine synthetase activity,

(2c) A protein which comprises an amino acid sequence having 60% or more sequence identity to the amino acid sequence represented by SEQ ID No. 3 and has a gamma-glutamylcysteine synthetase activity,

(2d) A protein having a gamma-glutamylcysteine synthetase activity, which comprises an amino acid sequence encoded by a DNA that hybridizes under stringent conditions to a DNA having a nucleotide sequence complementary to SEQ ID NO. 4, and

[9] The method according to [6] or [7], wherein the glutathione synthetase is selected from the following (3a) to (3 e):

(3a) a protein comprising the amino acid sequence represented by SEQ ID No.5,

(3b) A protein having glutathione synthetase activity, which comprises an amino acid sequence in which 1 or more amino acids in the amino acid sequence represented by SEQ ID NO.5 are deleted, substituted, inserted and/or added,

(3c) A protein which comprises an amino acid sequence having 60% or more sequence identity to the amino acid sequence represented by SEQ ID No.5 and has glutathione synthetase activity,

(3d) A protein having glutathione synthetase activity, which comprises an amino acid sequence encoded by DNA that hybridizes under stringent conditions to DNA having a base sequence complementary to SEQ ID NO. 6, and

[10] The method according to any one of [1] to [9], wherein the yeast has an enhanced glutathione transferase activity as compared with a parent strain.

[11] The method according to any one of [1] to [10], wherein the yeast is a yeast obtained by transformation with a DNA comprising a nucleotide sequence encoding a glutathione transporting enzyme.

[12] The method according to [10] or [11], wherein the glutathione transporting enzyme is selected from the following (4a) to (4 e):

(4a) a protein having the amino acid sequence shown in SEQ ID NO. 7,

(4b) A protein having glutathione transferase activity, which comprises an amino acid sequence in which 1 or more amino acids in the amino acid sequence represented by SEQ ID NO. 7 are deleted, substituted, inserted and/or added,

(4c) A protein which comprises an amino acid sequence having 60% or more sequence identity to the amino acid sequence represented by SEQ ID NO. 7 and has glutathione transferase activity,

(4d) A protein having glutathione transferase activity, which comprises an amino acid sequence encoded by DNA that hybridizes under stringent conditions to DNA having a base sequence complementary to SEQ ID NO. 8, and,

(4e) A protein having glutathione transferase activity, which comprises an amino acid sequence encoded by DNA having 1 or more nucleotides of the nucleotide sequence shown in SEQ ID NO. 8 substituted, deleted, inserted and/or added.

[13] The method according to any one of [1] to [12], wherein the yeast is a yeast of Saccharomyces (Saccharomyces), Candida (Candida), or Pichia (Pichia).

[14] The method according to any one of [1] to [13], wherein the yeast is a yeast that is not auxotrophic for a basic amino acid.

[15] The method according to any one of [1] to [14], wherein the medium contains molasses as a carbon source.

[16] The method according to any one of [1] to [15], wherein the concentration of the basic amino acid in the medium at the start of the culture is 0.8g/L or more.

[17] The method according to any one of [1] to [16], wherein the concentration of the basic amino acid in the medium is 2g/L or more.

[18] The method according to any one of [1] to [16], wherein the concentration of the basic amino acid in the medium is 4g/L or more.

[19] The method according to any one of [1] to [18], wherein the basic amino acid is lysine.

[20] A method of promoting yeast-based glutathione production, comprising:

the yeast is cultured in a medium having a basic amino acid concentration of 0.8g/L or more.

[21] The method according to [20], wherein the yeast has the characteristics as defined in any one of [2] to [14 ].

[22] The method according to [20] or [21], wherein the medium contains molasses as a carbon source.

[23] The method according to any one of [20] to [22], wherein the concentration of the basic amino acid in the medium at the start of the culture is 0.8g/L or more.

[24] The method according to any one of [20] to [23], wherein the concentration of the basic amino acid in the medium is 2g/L or more.

[25] The method according to any one of [20] to [23], wherein the concentration of the basic amino acid in the medium is 4g/L or more.

[26] The method according to any one of [20] to [25], wherein the basic amino acid is lysine.

[27] An accelerator for yeast-based production of glutathione, comprising a basic amino acid.

[28] The accelerating agent according to [27], wherein the yeast has the characteristics defined in any one of [2] to [14 ].

[29] The accelerator according to [27] or [28], wherein the basic amino acid is lysine.

[30] A culture medium composition for yeast, wherein the concentration of basic amino acid is 0.8g/L or more, and molasses is used as a carbon source.

[31] The medium composition for yeast according to [30], which is used for culturing a yeast having the characteristics as defined in any one of [2] to [14 ].

[32] The yeast culture medium composition according to [30] or [31], wherein the concentration of the basic amino acid is 2g/L or more.

[33] The yeast culture medium composition according to [30] or [31], wherein the concentration of the basic amino acid is 4g/L or more.

[34] The medium composition for yeast according to any one of [30] to [33], wherein the basic amino acid is lysine.

The present specification includes the disclosure of japanese patent application No. 2018-167655, which is the basis of priority of the present application.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, glutathione can be efficiently produced by a simple process of culturing yeast in a medium containing a sufficient amount of a basic amino acid such as lysine to promote glutathione production by the yeast. The yeast to be used is preferably a yeast containing a reduced Glutathione (GSH) and a glutathione (GSSG) at an intracellular content ratio of preferably 20 or more, more preferably 40 or more, more preferably 60 or more, more preferably 100 or more, more preferably 120 or more, based on the weight of the Glutathione (GSH) in the cell, as defined above.

Detailed Description

The method of the present invention will be described in detail below.

The method of the present invention is characterized by culturing yeast in a medium having a concentration of a basic amino acid such as lysine of 0.8g/L or more. By culturing the yeast under such conditions, the production of glutathione by the yeast can be promoted, and a yeast containing a large amount of glutathione (yeast having a high glutathione content) can be obtained. The reason why the production of glutathione by yeast is promoted by the presence of a basic amino acid at a concentration of 0.8g/L or more and the effect of containing a large amount of glutathione (the effect of increasing the glutathione content in yeast) is achieved is not clear.

The yeast cultured by the method of the present invention (yeast of the present invention) is not particularly limited, and may be a wild strain (natural yeast), a mutant strain obtained by mutation treatment, and preferably a mutant strain obtained by mutation treatment. In the present invention and the present specification, the term "wild strain" refers to a yeast originally present in nature, that is, a yeast in which an artificial mutation treatment has not been performed on a gene. In contrast, the "mutant strain" refers to a yeast obtained by artificially mutating a gene.

In the present invention, the mutation treatment is not particularly limited as long as it is a treatment capable of mutating a part of a gene of an organism such as yeast, and any method generally used for preparing a mutant strain of a microorganism such as yeast can be used. For example, the yeast can be subjected to mutation treatment by treating the yeast with ultraviolet rays, ionizing radiation, nitrous acid, nitrosoguanidine, ethyl methanesulfonate (hereinafter abbreviated as EMS), or the like as a mutagen.

The yeast of the present invention is preferably a yeast containing a reduced Glutathione (GSH) and GSSG in such a manner that the weight of the oxidized glutathione (GSSG) is preferably 20 or more, more preferably 40 or more, more preferably 60 or more, more preferably 100 or more, and more preferably 120 or more, when the weight of the reduced Glutathione (GSH) is 100, that is, a yeast containing a large amount of GSSG. The yeast containing a large amount of GSSG further preferably contains GSH and GSSG so that the weight of GSSG is 300 or less, more preferably 200 or less, and still more preferably 150 or less, when the weight of GSH is 100.

In addition, the yeast of the present invention may be, in particular, a yeast having a reduced glutathione reductase activity, and/or a yeast having an enhanced activity of γ -glutamylcysteine synthetase (GSH1) and/or glutathione synthetase (GSH2) and/or glutathione transferase (YCF 1).

In the present invention, "enzymatic activity enhancement" means: the activity of the target enzyme (the enzyme whose activity is to be enhanced) is enhanced as compared with that of the parent strain such as a wild strain. The term "enhancement of enzymatic activity" includes not only the case where the target enzymatic activity is enhanced in a yeast strain originally having the target enzymatic activity, but also the case where the target enzymatic activity is imparted to a yeast strain not originally having the target enzymatic activity. Examples of the enzyme whose activity is to be enhanced in the present invention include γ -glutamylcysteine synthetase, glutathione synthetase and glutathione transferase.

The enhancement of the enzyme activity can be achieved by artificially altering the gene of the yeast, for example. Such alteration can be achieved, for example, by increasing the expression of a gene encoding the enzyme of interest.

The increase in gene expression can be achieved, for example, by replacing the promoter of the gene on the chromosome with a stronger promoter. By "more potent promoter" is meant: a promoter in which the transcription of a gene is increased as compared with a wild-type promoter which is originally present. As a more potent promoter, a high-activity promoter of the original promoter can be obtained by using various reporter genes. Further, as a more potent promoter, known high expression promoters, for example, promoters of genes such as PGK1, PDC1, TDH3, TEF1, HXT7, and ADH1, can be used. The promoter to be used instead of the strong promoter may be used in combination with an increase in the copy number of the gene described later. As an example of using a more potent promoter, a method of enhancing the activity of a gamma-glutamylcysteine synthetase by substituting a promoter of the gamma-glutamylcysteine synthetase gene on a chromosomal DNA with a strong transcription promoter has been disclosed (Dazhukang et al, bioscience and industry, Vol. 50, No. 10, pp. 989 to 994, 1992)).

Further, the increase in gene expression can be achieved by increasing the copy number of the gene, for example.

The increase in the copy number of the gene can be achieved by transforming yeast with a DNA comprising a base sequence of an amino acid sequence encoding an enzyme of interest whose activity is desired to be enhanced. Transformation of yeast based on the above DNA can be carried out using a vector comprising the above DNA. The vector containing the DNA may be a vector introduced into genomic DNA of yeast, or a vector autonomously replicable in yeast cells.

The vector may further comprise a control element such as a promoter operably linked to the nucleotide sequence of the amino acid sequence encoding the target enzyme. Here, the control factor refers to a nucleotide sequence having a functional promoter, an arbitrarily related transcription element (for example, enhancer, CCAAT box, TATA box, SPI site, etc.), and the like. The term "operably linked" means that various regulatory elements such as a promoter and an enhancer that regulate gene expression are operably linked to a nucleotide sequence of an amino acid sequence encoding a target enzyme in a host cell. It is a matter well known to those skilled in the art that the type of control factor may vary depending on the host. The vector preferably further comprises a nucleotide sequence of a selectable marker gene.

Introduction of a vector comprising a DNA comprising a nucleotide sequence encoding an amino acid sequence of a target enzyme into a yeast genomic DNA can be carried out, for example, by homologous recombination. For example, a large number of copies of a gene can be introduced into genomic DNA of yeast by homologous recombination using a sequence having a large number of copies in genomic DNA as a target. Examples of sequences having a large number of copies in genomic DNA include an Autonomously Replicating Sequence (ARS) comprising a unique short repeat sequence and an rDNA sequence having about 150 copies. Examples of yeast transformation using the ARS-containing plasmid are described in WO 95/32289. Alternatively, a gene may be introduced into a transposon, and transferred to genomic DNA to introduce a large number of copies of the gene.

As the autonomously replicable vector to be used for increasing the number of copies of a gene by introducing the autonomously replicable vector into yeast, for example, a plasmid having a replication origin of CEN4 or a multicopy type plasmid having a replication origin of 2 μm DNA can be preferably used. A vector in which a target gene (DNA having a nucleotide sequence including an amino acid sequence encoding a target enzyme) is inserted together with a suitable promoter may be introduced into a host yeast to express the target gene. In addition, when a vector including a promoter suitable for expressing a target gene is used, the target gene may be expressed by the promoter in the vector.

As an example of a method for transforming a host yeast with a vector containing a DNA comprising a nucleotide sequence encoding an amino acid sequence of a target enzyme, there can be exemplified a method. DNA-F2 having a nucleotide sequence obtained by adding a cleavage sequence of restriction enzyme A to a nucleotide sequence homologous to the upstream region of the nucleotide sequence encoding the amino acid sequence of the target enzyme was synthesized in the genomic DNA sequence of the host yeast. On the other hand, DNA-R2 having a nucleotide sequence obtained by adding a cleavage sequence of restriction enzyme B to a nucleotide sequence homologous to a nucleotide sequence complementary to a nucleotide sequence in the downstream region of the nucleotide sequence was synthesized. Next, a recombinant vector was prepared by PCR amplification using genomic DNA of the host yeast as a template and DNA-F2 and DNA-R2 as primers, and the amplified DNA was cleaved with restriction enzymes A and B and ligated to a vector having a selection marker similarly cleaved with restriction enzymes A and B, and the recombinant vector was introduced into the host yeast to obtain a transformant. In addition, primer design and experimental operation can be performed based on the instructions of In-Fusion cloning kit (manufactured by Takara Bio Inc.), Gibson assembly system, NEBuilder (manufactured by New England Biolabs Inc.), etc., a PCR fragment containing DNA encoding a nucleotide sequence of an amino acid sequence of a target enzyme is seamlessly ligated to a vector to prepare a recombinant vector, and the recombinant vector is introduced into a host yeast to obtain a transformant. The method for introducing the recombinant vector into the host yeast is not particularly limited, and for example, a method using calcium ions, electroporation, spheroplast, lithium acetate, Agrobacterium infection, particle gun, polyethylene glycol, calcium phosphate, liposome, DEAE-dextran, microinjection, cationic lipid-mediated transfection, transduction, or infection can be used. Yeast strains transformed with DNA comprising a nucleotide sequence encoding the amino acid sequence of the enzyme of interest can be selected using the selection marker in the recombinant vector as an indicator.

In addition, the alteration of enhancement of the enzyme activity can be achieved, for example, by increasing the specific activity of the objective enzyme. The enzyme having an increased specific activity can be obtained by, for example, exploring various organisms. Alternatively, a high specific activity type of enzyme may be obtained by introducing a mutation into the original enzyme. The increase in specific activity may be used alone, or may be used in combination with any of the methods for increasing the expression of a gene as described above.

Confirmation of enhancement of the target enzyme activity can be carried out by measuring the activity of the enzyme. The γ -glutamylcysteine synthetase activity can be determined by the method of Jackson (Jackson, r.c., biochem.j.,111,309 (1969)). Glutathione synthetase activity can be determined by the method of Gushima et al (Gushima, T.et al, J.appl.biochem.,5,210 (1983)). Glutathione transporting enzyme activity can be measured by referring to THE Je Juuronal OF BIOLOGICAL CHEMISTRY Vol.273, No.50, 11.12.12.31, p.33449-33454, 1998.

Confirmation of an increase in the amount of transcription of a gene encoding a target enzyme can be performed by comparing the amount of mRNA transcribed from the gene with that of the parent strain. Examples of methods for evaluating the amount of mRNA include Northern hybridization and RT-PCR (Molecular cloning (Cold spring Harbor Laboratory Press, Cold spring Harbor (USA), 2001)). The amount of mRNA is preferably increased, for example, 1.5-fold or more, 2-fold or more, or 3-fold or more as compared with the parent strain.

Confirmation of the increase in the amount of the target enzyme can be carried out by Western blotting using an antibody (Molecular cloning (Cold spring Harbor Laboratory Press, Cold spring Harbor (USA), 2001)). The amount of the target enzyme is preferably increased, for example, 1.5-fold or more, 2-fold or more, or 3-fold or more as compared with the parent strain.

When the yeast of the present invention has a ploidy of 2 or more and the enzymatic activity is enhanced by the modification of the chromosome, the yeast of the present invention may have a chromosome modified so as to enhance the enzymatic activity and a wild-type chromosome, or may have a homozygote of a chromosome modified so as to enhance the enzymatic activity, as long as it can accumulate glutathione.

The term "reduced enzyme activity" as used herein means that the target enzyme activity is reduced as compared with that of a parent strain such as a wild strain, and includes the case where the activity is completely lost. The yeast having a decreased enzymatic activity is a yeast in which a gene encoding a target enzyme (an enzyme whose activity is to be decreased) is in a state of losing a function or in a state of having a decreased function, and specifically, there are mentioned: a yeast in a state in which the expression level of mRNA that is a transcription product of the gene or protein that is a translation product is reduced, or a yeast in a state in which the mRNA or the protein does not normally function as mRNA or protein. Examples of the enzyme whose activity is to be decreased in the present invention include glutathione reductase.

The reduction of the enzymatic activity can be achieved, for example, by artificially altering a gene of yeast. Such alteration can be achieved by, for example, mutation treatment, gene recombination technique, gene expression suppression treatment using RNAi, or the like.

Examples of the mutation treatment include: ultraviolet irradiation, or treatment with a mutagen used in a usual mutation treatment such as N-methyl-N' -nitro-N-nitrosoguanidine (MNNG), Ethyl Methanesulfonate (EMS), and Methyl Methanesulfonate (MMS).

As the gene recombination technique, for example, known techniques (FEMS Microbiology Letters 165(1998) 335-.

The alteration of the decrease in the enzymatic activity can be achieved, for example, by decreasing the expression of a gene encoding the enzyme of interest. Here, the gene encoding the target enzyme is typically contained in the genomic DNA of the host yeast. The gene encoding the target enzyme is a gene comprising a nucleotide sequence encoding an amino acid sequence of the target enzyme, and unless otherwise specified, it does not only indicate a coding region of the amino acid sequence, but also does not distinguish an expression regulatory sequence (such as a promoter sequence), an exon sequence, an intron sequence, and the like. When the expression regulatory sequence is changed, the expression regulatory sequence is preferably changed by 1 base or more, more preferably 2 bases or more, and particularly preferably 3 bases or more.

The modification to decrease the enzymatic activity preferably comprises a deletion of a gene encoding the enzyme of interest in the genomic DNA of the host yeast. The deletion of the gene may be a deletion of a part or all of the expression regulatory sequence, or a deletion of a part or all of the coding region of the amino acid sequence of the target enzyme. Here, "defect" means deletion or injury, and preferably deletion.

All the genes may be deleted including the sequences around the above-mentioned genes in the genomic DNA of the host yeast. When a part or all of the coding region of the amino acid sequence of the target enzyme is deleted, any region such as the N-terminal region, the internal region, and the C-terminal region may be deleted as long as the enzymatic activity can be reduced. In general, the gene can be reliably inactivated by growing the deleted region. In addition, the sequences before and after the deleted region are preferably not in reading frame. In a preferred embodiment, a yeast is used in which at least a part of the coding region and/or the expression regulatory sequence of the amino acid sequence in the gene encoding the target enzyme is deleted from the genomic DNA, and the deleted part is, for example, a region consisting of preferably 50% or more, more preferably 60% or more, more preferably 70% or more, more preferably 80% or more, more preferably 90% or more, and more preferably 100% of the total number of bases in the coding region and/or the expression regulatory sequence.

Further, as another example of the deletion of a gene encoding an amino acid sequence of a target enzyme with reduced enzymatic activity, there can be mentioned: the gene may be damaged by introducing an amino acid substitution (missense mutation), a stop codon (nonsense mutation), or a frame shift mutation by adding or deleting 1 to 2 nucleotides to or from the coding region of the gene encoding the target enzyme on the genomic DNA.

The deletion of a gene encoding an amino acid sequence of a target enzyme with reduced enzymatic activity can be achieved, for example, by inserting another sequence into an expression regulatory sequence or a coding region of the gene encoding the target enzyme on the genomic DNA. The insertion site may be any region of the gene, and the gene can be reliably inactivated by the long insertion sequence. In addition, the sequences before and after the insertion site are preferably not in reading frame. The other sequences are not particularly limited as long as the function of the encoded protein is reduced or eliminated, and examples thereof include a marker gene and a gene useful for production of a γ -glutamyl compound such as glutathione.

The gene deletion on the genomic DNA as described above can be achieved by: for example, an inactive gene is prepared by changing a gene encoding the amino acid sequence of the target enzyme to one that does not produce a normally functioning protein, and the gene on the genomic DNA is replaced with the inactive gene by transforming yeast with a recombinant DNA containing the inactive gene to cause homologous recombination between the inactive gene and the gene on the genomic DNA. In this case, the recombinant DNA can be easily manipulated when it contains a marker gene in advance according to the phenotype such as auxotrophy of the host. In addition, when the recombinant DNA is previously made linear by cleavage with a restriction enzyme, etc., a strain in which the recombinant DNA is introduced into genomic DNA can be obtained efficiently. Even when produced, a protein encoded by an inactive gene has a different steric structure from a wild-type protein, and the function thereof is reduced or eliminated.

Depending on the structure of the recombinant DNA used, as a result of homologous recombination, the wild-type gene and the inactive gene may be inserted into the genomic DNA in a state in which other parts of the recombinant DNA (for example, a vector part and a marker gene) are sandwiched. Since the wild-type gene functions in this state, homologous recombination is caused again among the 2 genes as needed, and 1 copy of the wild-type gene is detached from the genomic DNA together with the vector portion and the marker gene, and the sequence in which the inactive gene remains is selected.

For example, a linear DNA comprising an arbitrary sequence and having, at both ends of the arbitrary sequence, sequences upstream and downstream of a site to be substituted (typically, a part or all of a gene encoding a target enzyme) on a genomic DNA is transformed into a yeast, and homologous recombination is caused upstream and downstream of the site to be substituted, respectively, whereby the site to be substituted can be substituted with the arbitrary sequence in 1 step. As the arbitrary sequence, for example, a sequence containing a marker gene can be used. The marker gene may also be subsequently removed as desired. When the marker gene is removed, sequences for homologous recombination may be added to both ends of the marker gene so that the marker gene can be efficiently removed.

The decrease in the target enzyme activity can be confirmed by measuring the activity of the enzyme. For example, the activity of glutathione reductase can be measured by a known method (product number 7510-100-K of glutathione reductase assay kit manufactured by Cosmo Bio Inc.).

The confirmation of the decrease in the amount of transcription of the gene encoding the target enzyme can be performed by comparing the amount of mRNA transcribed from the homologous gene with that of the parent strain. Examples of methods for evaluating the amount of mRNA include Northern hybridization and RT-PCR (Molecular cloning (Cold spring Harbor Laboratory Press, Cold spring Harbor (USA), 2001)). The amount of mRNA is preferably reduced to, for example, 50% or less, 20% or less, 10% or less, 5% or less, or 0% as compared to the parent strain.

Confirmation of the decrease in the amount of the target enzyme can be carried out by Western blotting using an antibody (Molecular cloning (Cold spring Harbor Laboratory Press, Cold spring Harbor (USA), 2001)). The amount of the target enzyme is preferably reduced to, for example, 50% or less, 20% or less, 10% or less, 5% or less, or 0% as compared with the parent strain.

As the transformation method of yeast, there can be used a method generally used for transformation of yeast, such as protoplast method, KU method (H.Ito et al., J.Bateriol.,153-163(1983)), KUR method (Fermentation and Industry, vol.43, p.630-637(1985)), electroporation method (Luis et al., FEMS microbiology Letters 165 (1998)) 335-340), method using vector DNA (Gietz R.D.and Schiestl R.H., Methods mol.cell.biol.5:255-269(1995)), and the like. Operations such as cell formation of yeast and isolation of haploid yeast are described in "experimental technique for yeast of chemical and biological experiment line 31", first edition, guang Chuan bookshop; "Biomanual 10 Gene experiment method Using Yeast" first edition, Yangtze society, and the like.

When the yeast of the present invention has a ploidy of 2 or more, it is possible to hybridize a gene modified to decrease the enzymatic activity with a wild-type gene, and it is generally preferable to homozygote the gene modified to decrease the enzymatic activity, as long as the yeast of the present invention can accumulate a γ -glutamyl compound such as glutathione.

(1) Glutathione reductase

The glutathione reductase is an enzyme having an activity of reducing oxidized glutathione represented by the following formula (2) with NADPH (reduced nicotinamide dinucleotide phosphate).

Since the activity of converting GSSG into GSH is low in the yeast in which the glutathione reductase activity is inhibited, GSSG tends to accumulate. The yeast in which the glutathione reductase activity is inhibited is particularly preferably a yeast containing a large amount of GSSG which contains GSH and GSSG so that the weight of GSSG is preferably 20 or more, more preferably 40 or more, more preferably 60 or more, more preferably 100 or more, and more preferably 120 or more, when the weight of GSH is 100. The yeast in which glutathione reductase activity is inhibited further preferably contains GSH and GSSG so that the weight of GSSG is preferably 300 or less, more preferably 200 or less, and still more preferably 150 or less, when the weight of GSH is 100.

[ chemical formula 1]

The glutathione reductase in the present invention is not particularly limited as long as it has an activity of reducing a disulfide bond with NADPH or NADH (i.e., glutathione reductase activity), and is preferably any of the following (1a) to (1 e):

(1a) a protein comprising the amino acid sequence shown in SEQ ID NO. 1,

(1c) A protein which comprises an amino acid sequence having 60% or more sequence identity to the amino acid sequence represented by SEQ ID NO. 1 and has glutathione reductase activity,

Here, the arbitrary proteins in the above (1a) to (1e) are not limited to the form composed of polypeptide chains composed only of the amino acid sequences defined in the above (1a) to (1e), and may be a form in which the polypeptide chains are chemically modified with sugar chains or the like, or a form in which the polypeptide chains are fused with other polypeptide chains.

The protein comprising the amino acid sequence in which 1 or more amino acids are substituted, inserted, deleted and/or added in the amino acid sequence represented by SEQ ID NO. 1 described in (1b) above can be prepared according to a known method described in "Current Protocols in Molecular Biology (John Wiley and Sons, Inc., 1989)" and the like, and is included in the protein as long as it has glutathione reductase activity.

The amino acid sequence modified by substitution, insertion, deletion and/or addition may contain only 1 type of modification (e.g., substitution), or 2 or more types of modification (e.g., substitution and insertion). In the case of substitution, the substituted amino acid is preferably an amino acid having properties similar to those of the amino acid before substitution (homologous amino acid). Here, amino acids in the same group of each group listed below are referred to as homologous amino acids.

(group 1: neutral nonpolar amino acid) Gly, Ala, Val, Leu, Ile, Met, Cys, Pro, Phe

(group 2: neutral polar amino acids) Ser, Thr, Gln, Asn, Trp, Tyr

(group 3: acidic amino acids) Glu, Asp

(group 4: basic amino acids) His, Lys, Arg

In the above (1b), "1 or more" amino acids mean, for example, 1 to 60, preferably 1 to 20, more preferably 1 to 15, further preferably 1 to 10, further preferably 1 to 5, 1 to 4, 1 to 3 or 1 to 2 amino acids.

In the above (1c), the sequence identity with the amino acid sequence represented by SEQ ID NO. 1 is preferably 60% or more, more preferably 70% or more, further preferably 80% or more, further preferably 85% or more, further preferably 90% or more, further preferably 95% or more, further preferably 97% or more, further preferably 98% or more, and most preferably 99% or more. For the sequence identity of amino acid sequences, the amino acid sequence shown in SEQ ID NO. 1 or 2 is compared with the amino acid sequence to be evaluated, and the number of positions at which the amino acids in the two sequences are identical is divided by the number of total amino acids to be compared and multiplied by 100, and the obtained value is used to represent the value.

In the above (1d), the DNA that hybridizes with the DNA having the base sequence complementary to the base sequence represented by SEQ ID NO. 2 under stringent conditions refers to a DNA obtained by using a DNA having a base sequence complementary to the base sequence represented by SEQ ID NO. 2 as a probe under stringent conditions using a colony hybridization method, a plaque hybridization method, a Southern hybridization method, or the like.

Hybridization can be carried out according to the method described in "Molecular Cloning, A Laboratory manual, second edition (Cold Spring Harbor Laboratory Press, 1989)" and the like. Here, the DNA hybridized under stringent conditions includes, for example, DNA obtained by hybridizing at 65 ℃ in the presence of 0.7 to 1.0M NaCl using a filter to which DNA derived from a colony or a plaque is immobilized, and then washing the filter at 65 ℃ using a 2-fold concentration SSC solution (the composition of the 1-fold concentration SSC solution includes 150mM sodium chloride and 15mM sodium citrate). Preferred is a DNA obtainable by washing with a 1-fold concentration of SSC solution at 65 ℃, more preferred is a DNA obtainable by washing with a 0.5-fold concentration of SSC solution at 65 ℃, still more preferred is a DNA obtainable by washing with a 0.2-fold concentration of SSC solution at 65 ℃, and most preferred is a DNA obtainable by washing with a 0.1-fold concentration of SSC solution at 65 ℃.

As described above, the hybridization conditions are described, but the hybridization conditions are not particularly limited to these conditions. As the factors affecting the stringency of hybridization, a plurality of factors such as temperature and salt concentration may be considered, and those skilled in the art can appropriately select these factors to achieve optimum stringency.

The DNA that can be hybridized under the above conditions includes DNA having a sequence identity of 70% or more, preferably 74% or more, more preferably 79% or more, further preferably 85% or more, further more preferably 90% or more, further more preferably 95% or more, further more preferably 97% or more, further more preferably 98% or more, and most preferably 99% or more with the DNA represented by sequence No. 2.

For the sequence identity (%) of DNA, the 2 DNAs to be compared are optimally aligned, and the number of positions where the nucleobases (e.g., A, T, C, G, U or I) are identical in the sequences of the two is divided by the total number of bases to be compared, and the result is multiplied by 100 and expressed as a numerical value.

The sequence identity of DNA can be calculated, for example, using the following tools for sequence analysis: GCG Wisconsin Package (Program Manual for The Wisconsin Package, version8, 9.1994, Genetics Computer Group,575Science Drive Medison, Wisconsin, USA 53711; Rice, P. (1996) Program Manual for EGCG Package, Peter Rice, The Sanger Centre, Hinxton Hall, Cambridge, CB 101 RQ, England), and The. e.xPASy World Wide Web servers (Geneva University Hospital and University of Geneva, Switzerland).

In the above (1e), the DNA having substitution, deletion, insertion and/or addition of 1 or more bases in the base sequence represented by SEQ ID NO. 2 can be prepared by a known method described in "Current Protocols in Molecular Biology (John Wiley and Sons, Inc., 1989)" or the like.

The base sequence changed by substitution, insertion, deletion and/or addition may include only 1 type of change (e.g., substitution), or may include 2 or more types of changes (e.g., substitution and insertion).

In the above (1e), "1 or more" bases are not particularly limited as long as the protein encoded by the DNA has glutathione reductase activity, and mean, for example, 1 to 150 bases, preferably 1 to 100 bases, more preferably 1 to 50 bases, further preferably 1 to 20 bases, further more preferably 1 to 10 bases, 1 to 5 bases, 1 to 4 bases, 1 to 3 bases or 1 to 2 bases.

Examples of a method for confirming that the proteins (1a) to (1e) have glutathione reductase activity include the following methods: a transformant expressing a protein whose activity is to be confirmed is prepared by a DNA recombination method, and after the protein is produced using the transformant, the protein, oxidized glutathione and NADPH are allowed to exist in an aqueous medium, and whether or not reduced glutathione or NADP is produced or accumulated in the aqueous medium is analyzed by HPLC or the like.

In the present invention, the glutathione reductase activity is preferably reduced to 50% or less, more preferably reduced to 20% or less, further preferably reduced to 10% or less, and particularly preferably reduced to 5% or less, as compared with the parent strain. In addition, it is particularly preferable that the glutathione reductase activity is substantially lost.

The glutathione reductase of the present invention is preferably GLR1 having the amino acid sequence shown in sequence No. 1 among the above proteins. SEQ ID NO. 2 shows the nucleotide sequence of the GLR1 gene encoding the amino acid sequence of GLR1 shown in SEQ ID NO. 1.

The glutathione reductase activity of the protein (1b), (1c), (1d) or (1e) is preferably the same as or higher than the glutathione reductase activity of the protein (1a), more preferably 50% or more, 80% or more, 90% or more or 100% or more, and still more preferably 200% or less or 150% or less of the glutathione reductase activity of the protein (1 a).

(2) Gamma-glutamylcysteine synthetase

The γ -glutamylcysteine synthetase in the present invention is not particularly limited as long as it has an activity of condensing glutamic acid with cysteine to synthesize γ -glutamylcysteine (i.e., γ -glutamylcysteine synthetase activity), and is preferably any of the following (2a) to (2 e):

(2a) a protein comprising the amino acid sequence shown in SEQ ID No. 3,

(2c) A protein which comprises an amino acid sequence having 60% or more sequence identity to the amino acid sequence represented by SEQ ID No. 3 and has a gamma-glutamylcysteine synthetase activity,

Here, the protein of any one of the above (2a) to (2e) is not limited to the form composed of a polypeptide chain composed only of the amino acid sequence defined in the above (2a) to (2e), and may be a form in which the polypeptide chain is chemically modified with a sugar chain or the like, or a form in which the polypeptide chain is fused with another polypeptide chain.

The protein comprising the amino acid sequence of (2b) wherein 1 or more amino acids in the amino acid sequence represented by SEQ ID NO. 3 are substituted, inserted, deleted and/or added can be prepared by the method described in (1) above, and is included in the protein as long as it has γ -glutamylcysteine synthetase activity.

In the above (2b), "1 or more" amino acids mean, for example, 1 to 60, preferably 1 to 20, more preferably 1 to 15, further preferably 1 to 10, further preferably 1 to 5, 1 to 4, 1 to 3 or 1 to 2 amino acids.

In the above (2c), the sequence identity with the amino acid sequence represented by SEQ ID NO. 3 is preferably 60% or more, more preferably 70% or more, further preferably 80% or more, further preferably 85% or more, further preferably 90% or more, further preferably 95% or more, further preferably 97% or more, further preferably 98% or more, and most preferably 99% or more. The sequence identity of amino acid sequences can be calculated by the method described above in (1).

In the above (2d), the DNA that hybridizes with the DNA having the base sequence complementary to the base sequence represented by SEQ ID NO. 4 under stringent conditions refers to a DNA obtained by using a DNA having a base sequence complementary to the base sequence represented by SEQ ID NO. 4 as a probe under stringent conditions using a colony hybridization method, a plaque hybridization method, a Southern hybridization method, or the like. The conditions for hybridization and the like are as described in (1).

The DNA capable of hybridizing under the above conditions includes DNA having a sequence identity of 70% or more, preferably 74% or more, more preferably 79% or more, further preferably 85% or more, further more preferably 90% or more, further more preferably 95% or more, further more preferably 97% or more, further more preferably 98% or more, and most preferably 99% or more with the DNA represented by SEQ ID NO. 4. The sequence identity (%) of the DNA was as described in (1).

In the above (2e), the DNA having substitution, deletion, insertion and/or addition of 1 or more bases in the base sequence represented by SEQ ID NO. 4 can be prepared by the method described in (1).

In the above (2e), "1 or more" bases are not particularly limited as long as the protein encoding the DNA has γ -glutamylcysteine synthetase activity, and are, for example, 1 to 150 bases, preferably 1 to 100 bases, more preferably 1 to 50 bases, further preferably 1 to 20 bases, further more preferably 1 to 10 bases, 1 to 5 bases, 1 to 4 bases, 1 to 3 bases or 1 to 2 bases.

Examples of the method for confirming that the proteins (2a) to (2e) have γ -glutamylcysteine synthetase activity include the following methods: for example, a transformant expressing a protein whose activity is to be confirmed is prepared by a DNA recombination method, and after the protein is produced using the transformant, the protein, L-glutamic acid and L-cysteine are allowed to exist in an aqueous medium, and whether or not γ -glutamylcysteine is produced or accumulated in the aqueous medium is analyzed by HPLC or the like. ATP is preferably further present in the aqueous medium as required.

The γ -glutamylcysteine synthetase of the present invention is preferably GSH1 having the amino acid sequence shown in sequence No. 3 among the above proteins. The nucleotide sequence of GSH1 gene encoding the amino acid sequence of GSH1 shown in SEQ ID NO. 3 is shown in SEQ ID NO. 4.

The γ -glutamylcysteine synthetase activity of the protein of the above (2b), (2c), (2d) or (2e) is preferably about the same as or higher than that of the protein of the above (2a), more preferably 50% or more, 80% or more, 90% or more or 100% or more, and still more preferably 200% or less or 150% or less of that of the protein of the above (2 a).

(3) Glutathione synthetase

The glutathione synthetase in the present invention is not particularly limited as long as it has an activity of synthesizing glutathione by condensing γ -glutamylcysteine and glycine (i.e., glutathione synthetase activity), and is preferably any of the following (3a) to (3 e):

(3a) a protein comprising the amino acid sequence represented by SEQ ID No.5,

(3c) A protein which comprises an amino acid sequence having 60% or more sequence identity to the amino acid sequence represented by SEQ ID No.5 and has glutathione synthetase activity,

Here, the protein of any one of the above (3a) to (3e) is not limited to the form composed of a polypeptide chain composed only of the amino acid sequence of the above (3a) to (3e), and may be a form in which the polypeptide chain is chemically modified with a sugar chain or the like, or a form in which the polypeptide chain is fused with another polypeptide chain.

The protein comprising the amino acid sequence of SEQ ID NO.5 in which 1 or more amino acids are substituted, inserted, deleted and/or added as described in (3b) above can be prepared by the method described in (1) above, and is included in the protein as long as it has glutathione synthetase activity.

The amino acid sequence modified by substitution, insertion, deletion and/or addition may contain only 1 type of modification (e.g., substitution), or 2 or more types of modification (e.g., substitution and insertion). In the case of substitution, the substituted amino acid is preferably an amino acid having properties similar to those of the amino acid before substitution (homologous amino acid). For the homologous amino acids, as described in (1).

In the above (3b), "1 or more" amino acids mean, for example, 1 to 60, preferably 1 to 20, more preferably 1 to 15, further preferably 1 to 10, further preferably 1 to 5, 1 to 4, 1 to 3 or 1 to 2 amino acids.

In the above (3c), the sequence identity with the amino acid sequence represented by SEQ ID NO.5 is preferably 60% or more, more preferably 70% or more, further preferably 80% or more, further preferably 85% or more, further preferably 90% or more, further preferably 95% or more, further preferably 97% or more, further preferably 98% or more, and most preferably 99% or more. The sequence identity of amino acid sequences can be calculated by the method described above in (1).

In the above (3d), the DNA that hybridizes with the DNA having the base sequence complementary to the base sequence represented by SEQ ID NO. 6 under stringent conditions refers to a DNA obtained by using a DNA having a base sequence complementary to the base sequence represented by SEQ ID NO. 6 as a probe under stringent conditions using a colony hybridization method, a plaque hybridization method, a Southern hybridization method, or the like. The conditions for hybridization and the like are as described in (1).

In the above (3e), the DNA having substitution, deletion, insertion and/or addition of 1 or more bases in the base sequence represented by SEQ ID NO. 6 can be prepared by the method described in (1).

In the above (3e), "1 or more" bases are not particularly limited as long as the protein encoded by the DNA has glutathione synthetase activity, and are, for example, 1 to 150 bases, preferably 1 to 100 bases, more preferably 1 to 50 bases, further preferably 1 to 20 bases, further more preferably 1 to 10 bases, 1 to 5 bases, 1 to 4 bases, 1 to 3 bases or 1 to 2 bases.

Examples of a method for confirming that the proteins (3a) to (3e) have glutathione synthetase activity include the following methods: for example, a transformant expressing a protein whose activity is to be confirmed is prepared by a DNA recombination method, and after the protein is produced using the transformant, the protein, γ -glutamylcysteine and glycine are allowed to exist in an aqueous medium, and whether or not glutathione is produced and accumulated in the aqueous medium is analyzed by HPLC or the like. ATP is preferably further present in the aqueous medium as required.

The glutathione synthetase in the present invention is preferably GSH2 having the amino acid sequence shown in SEQ ID NO. 5. The nucleotide sequence of GSH2 gene encoding the amino acid sequence of GSH2 shown in SEQ ID NO.5 is shown in SEQ ID NO. 6.

The glutathione synthetase activity of the protein of the above (3b), (3c), (3d) or (3e) is preferably about the same as or higher than the glutathione synthetase activity of the protein of the above (3a), more preferably 50% or more, 80% or more, 90% or more or 100% or more, and still more preferably 200% or less or 150% or less of the glutathione synthetase activity of the protein of the above (3 a).

(4) Glutathione transporters

In the present invention, the glutathione transporting enzyme is an enzyme having a function of transporting cytoplasmic glutathione to vacuoles (i.e., glutathione transporting enzyme activity), and is not particularly limited as long as it has the function.

The glutathione transporting enzyme is preferably any one of the following (4a) to (4 e):

(4a) a protein having the amino acid sequence shown in SEQ ID NO. 7,

(4c) A protein which comprises an amino acid sequence having 60% or more sequence identity to the amino acid sequence represented by SEQ ID NO. 7 and has glutathione transferase activity,

Here, the protein of any one of the above (4a) to (4e) is not limited to the form composed of a polypeptide chain composed only of the amino acid sequence defined in the above (4a) to (4e), and may be a form in which the polypeptide chain is chemically modified with a sugar chain or the like, or a form in which the polypeptide chain is fused with another polypeptide chain.

The protein comprising the amino acid sequence of SEQ ID NO. 7 in which 1 or more amino acids are substituted, inserted, deleted and/or added as described in (4b) above can be produced by the method described in (1) above, and is included in the protein as long as it has glutathione transporting enzyme activity.

The amino acid sequence modified by substitution, insertion, deletion and/or addition may contain only 1 type of modification (e.g., substitution), or 2 or more types of modification (e.g., substitution and insertion). In the case of substitution, the substituted amino acid is preferably an amino acid having properties similar to those of the amino acid before substitution (homologous amino acid). For the homologous amino acids, as described in (1).

In the above (4b), "1 or more" amino acids mean, for example, 1 to 60, preferably 1 to 20, more preferably 1 to 15, further preferably 1 to 10, further preferably 1 to 5, 1 to 4, 1 to 3 or 1 to 2 amino acids.

In the above (4c), the sequence identity with the amino acid sequence represented by SEQ ID NO. 7 is preferably 60% or more, more preferably 70% or more, further preferably 80% or more, further preferably 85% or more, further preferably 90% or more, further preferably 95% or more, further preferably 97% or more, further preferably 98% or more, and most preferably 99% or more. The sequence identity of amino acid sequences can be calculated by the method described above in (1).

In the above (4d), the DNA that hybridizes with the DNA having the base sequence complementary to the base sequence represented by SEQ ID NO. 8 under stringent conditions refers to a DNA obtained by using a DNA having a base sequence complementary to the base sequence represented by SEQ ID NO. 8 as a probe under stringent conditions using a colony hybridization method, a plaque hybridization method, a Southern hybridization method, or the like. The conditions for hybridization and the like are as described in (1).

In the above (4e), the DNA having substitution, deletion, insertion and/or addition of 1 or more bases in the base sequence represented by SEQ ID NO. 8 can be prepared by the method described in (1).

In the above (4e), "1 or more" bases are not particularly limited as long as the protein encoded by the DNA has glutathione transferase activity, and include, for example, 1 to 150 bases, preferably 1 to 100 bases, more preferably 1 to 50 bases, further preferably 1 to 20 bases, further more preferably 1 to 10 bases, 1 to 5 bases, 1 to 4 bases, 1 to 3 bases, or 1 to 2 bases.

The glutathione transferase of the present invention is preferably YCF1 having the amino acid sequence shown in SEQ ID NO. 7. The nucleotide sequence of YCF1 gene encoding the amino acid sequence of YCF1 shown in SEQ ID NO. 7 is shown in SEQ ID NO. 8.

The glutathione transporting enzyme activity of the protein (4b), (4c), (4d) or (4e) is preferably about the same as or higher than the glutathione transporting enzyme activity of the protein (4a), more preferably 50% or more, 80% or more, 90% or more or 100% or more, and still more preferably 200% or less or 150% or less of the glutathione transporting enzyme activity of the protein (4 a).

(5) Yeast of the present invention

The yeast of the present invention is not particularly limited as long as it has glutathione producing ability, and examples thereof include: saccharomyces cerevisiae (Saccharomyces cerevisiae), Saccharomyces carlsbergensis (Saccharomyces carlsbergensis), Saccharomyces fragilis (Saccharomyces fragilis), Saccharomyces rouxii (Saccharomyces rouxii), Candida utilis (Candida utilis), Candida tropicalis (Candida tropicalis), Schizosaccharomyces pombe (Schizosaccharomyces pombe), Torulopsis variabilis (Toluropsis versatilis), Torulopsis variabilis (Toluropsis petriilis), Torulopsis sp.sp.petrosella (Toluropsis petri), Pichia pastoris (Pichia pastoris), Saccharomyces carvatus (Brettanomyces), Saccharomyces buddlejae (Mycotorula), Rhodotorula rubra, Saccharomyces cerevisiae (Hansenula, Saccharomyces cerevisiae), and Saccharomyces cerevisiae (Saccharomyces cerevisiae). Among them, preferred are yeasts belonging to the genus Saccharomyces, Candida or Pichia, and more preferred are Saccharomyces cerevisiae belonging to the genus Saccharomyces and Candida utilis belonging to the genus Candida. For example, Saccharomyces cerevisiae 24-51-78 (accession number: FERM BP-19072) can be preferably used as the parent strain. Saccharomyces cerevisiae 24-51-78 was internationally deposited at 18.10.2002 in patent organism depositary center for basic patent organization for evaluation of independent administrative human products (Fusarium 2-5-8120, manufactured by Otsu かずさ, Kyowa prefecture, Japan) (accession No.: Saccharomyces cerevisiae 24-51-78, accession No.: FERM BP-19072, attached to depositor).

(6) Culture medium containing basic amino acid

In the present invention, the "basic amino acid" is typically 1 or more selected from lysine, arginine and histidine, more preferably 1 or more selected from lysine and arginine, and most preferably lysine. The basic amino acid is preferably the L form.

The concentration of the basic amino acid in the medium used in the present invention is 0.8g/L or more, preferably 1g/L or more, more preferably 2g/L or more, and particularly preferably 4g/L or more. When 2 or more basic amino acids are contained, the total concentration of the basic amino acids may be in the above range, and the concentration of each basic amino acid is preferably 0.8g/L or more, preferably 1g/L or more, more preferably 2g/L or more, and particularly preferably 4g/L or more.

The upper limit of the concentration of the basic amino acid in the medium used in the present invention is not particularly limited, but is usually 100g/L or less, preferably 50g/L or less, and more preferably 20g/L or less. When 2 or more basic amino acids are contained, the concentration of each basic amino acid is usually 100g/L or less, preferably 50g/L or less, and more preferably 20g/L or less.

The basic amino acid may be present in the form of a salt.

The medium used in the present invention preferably contains the basic amino acid in the above-mentioned concentration range at the start of yeast culture. The present inventors have unexpectedly found that the effect of containing a large amount of glutathione is particularly high in the case of culturing yeast in a medium containing a basic amino acid in the above-mentioned concentration range at the start of the culture. In this case, the concentration of the basic amino acid in the culture medium is less than 0.8g/L in the yeast culture, which is also within the scope of the present embodiment.

The medium used in the present invention is not particularly limited as long as it contains a basic amino acid. That is, a synthetic medium, a semi-synthetic medium, or a natural (complex) medium may be used as long as it contains a carbon source, a nitrogen source, an inorganic substance, other nutrients, and the like as appropriate.

The medium used in the present invention may be a liquid medium or a solid medium, and a liquid medium is particularly preferable.

As the carbon source contained in the medium containing a basic amino acid, various carbohydrate raw materials such as molasses, glucose, glycerol, fructose, sucrose, maltose, mannose, mannitol, xylose, galactose, starch, and a starch hydrolysate can be used. In addition, various organic acids such as pyruvic acid, acetic acid, and lactic acid, and various amino acids such as aspartic acid and alanine can also be used.

A particularly preferred embodiment of the medium containing basic amino acids comprises molasses as carbon source. Molasses is a viscous, dark brown liquid by-product mainly composed of sugar, which is produced when sugar is purified from a raw material such as sugarcane or beet. The medium containing the basic amino acid is more preferably a liquid medium containing molasses in an amount of 1% by weight or more, more preferably 2% by weight or more, and still more preferably 3% by weight or more, based on the sugar contained in the molasses, and the upper limit of the content of the molasses is not particularly limited, and for example, a liquid medium containing molasses in an amount of 10% by weight or less, 5% by weight or less, and 4% by weight or less, based on the sugar contained in the molasses. The medium containing the basic amino acid may further contain a carbon source other than molasses, and more preferably a medium (molasses medium) in which molasses is contained in an amount of at least 10% by weight of the total carbon source. The sugars contained in the molasses can be determined by the Bertrand method after acid hydrolysis.

As the nitrogen source contained in the medium containing a basic amino acid, various inorganic or organic ammonium salts such as ammonia, ammonium chloride, ammonium phosphate, ammonium sulfate, ammonium nitrate, ammonium carbonate and ammonium acetate, urea and other nitrogen-containing compounds, nitrogen-containing organic substances such as peptone, NZ amine, meat extract, yeast extract, corn steep liquor, casein hydrolysate, fish meal or digest thereof, defatted soybean or digest thereof and hydrolysate thereof, and various amino acids such as aspartic acid, glutamic acid and threonine can be used.

Examples of the inorganic substance contained in the medium containing a basic amino acid include potassium monohydrogen phosphate, potassium dihydrogen phosphate, magnesium sulfate, sodium chloride, ferrous sulfate, manganese sulfate, and calcium carbonate.

(7) Yeast-based production of glutathione

The method of the present invention comprises culturing yeast in a medium containing a basic amino acid at a given concentration.

The culture is carried out under aerobic culture conditions such as shaking culture and aeration-agitation submerged culture. The pH during the culture is preferably controlled to 3.0 to 8.0, more preferably 4.0 to 6.0, and most preferably 5.0. As the neutralizing agent for pH control, ammonia, sodium hydroxide, ammonium carbonate, or the like can be used. The amount of air supplied to the culture medium during aerobic culture is preferably 0.2L/min or more, more preferably 0.5L/min or more, and still more preferably 1L/min or more, relative to 1L of the culture medium. In the case of culturing using a fermentor (Jar regulator), the number of stirring is preferably 200rpm or more, more preferably 300rpm or more, and still more preferably 400rpm or more. The capacity of the fermentation tank is not particularly limited, and for example, a fermentation tank having a total capacity of 2L can be exemplified. The temperature during the culture is usually 20 to 45 ℃, preferably 25 to 35 ℃, and most preferably 28 to 32 ℃. The culture period is usually 16 to 72 hours, preferably 24 to 48 hours. The initial cell concentration (feed concentration) to be added to the medium varies depending on the kind of yeast, the composition of the medium, and the like, but the initial turbidity (OD600) is preferably 0.01 to 2.0, more preferably 0.02 to 1.0, and still more preferably 0.1 to 0.4. As for the carbon source such as glucose, any of a batch system in which the carbon source is collectively charged at the initial stage of culture and cultured and a fed-batch system in which the carbon source is added little by little with the culture period can be used, but according to the results of the study by the present inventors, the growth rate is increased and the final bacterial concentration is also higher depending on the microorganism used, and therefore, the activity of the enzyme involved in glutathione synthesis in the bacterial cells is also increased, which is more preferable. As an index for determining the feeding rate of a carbon source such as glucose in the fed-batch method, the turbidity of the culture solution, the oxygen consumption rate, the carbon dioxide generation rate, the consumption amount of a neutralizing agent for pH adjustment, and the like can be used, and by selecting an appropriate index according to the yeast to be used and changing the feeding rate of the carbon source in accordance with the change, the yeast culture can be optimized, and the final cell concentration and the activity of the enzyme involved in glutathione synthesis can be improved, and as a result, the productivity of glutathione can be improved. Among them, as described above, it is preferable to add the basic amino acid to the medium together in a batch system at the initial stage of the culture.

By culturing the yeast of the present invention in a culture medium, a culture mixture comprising a yeast containing glutathione mainly in a high concentration in the cell bodies and the culture medium can be obtained. The method for producing glutathione of the present invention preferably further comprises recovering glutathione from the obtained culture mixture.

To recover glutathione from the culture mixture, for example, glutathione can be extracted from the yeast cells obtained by separating the yeast cells in the culture mixture from the culture medium by filtration or centrifugation, and optionally combining the yeast cells with a suitable combination of hot water extraction, alkaline extraction, enzymatic degradation, self-digestion, physical disruption, and the like. The culture mixture after the culture may be subjected to the above-mentioned extraction procedure as it is, or may be subjected to an enzymatic decomposition method, a self-digestion method, or a physical disruption procedure to elute glutathione in the yeast cells into the culture medium, and then subjected to the above-mentioned extraction procedure to extract glutathione. Glutathione is purified from the glutathione thus obtained by a general method, whereby a fraction highly containing glutathione or glutathione powder can be obtained.

Further, by reducing oxidized glutathione contained in glutathione obtained in the above-described step, glutathione having an increased reduced form ratio can be obtained. The method for reduction is not particularly limited, and reduction using glutathione reductase is preferably exemplified.

Examples

The present invention will be described in more detail below with reference to examples and the like, but the present invention is not limited to the examples and the like below. In the following examples, "reduced glutathione content (% (w/w)) per dry cell weight" is sometimes referred to as "GSH content (%)", and "oxidized glutathione content (% (w/w)) per dry cell weight" is sometimes referred to as "GSSG content (%)". If not otherwise specified, "%" means "% (w/w)".

Production example 1 preparation of GLR1 Gene-disrupted Yeast (GLR 1-disrupted Strain)

A disrupted strain GLR1, which is obtained by disrupting a glutathione reductase (GLR1) gene encoding the amino acid sequence shown by SEQ ID NO. 1, was obtained by preparing a plasmid having a gRNA portion of vector pD1511 (ATUM) for S.cereviciae of sequence No. 5'-GATTACCTCGTCATCGGGGG-3' (SEQ ID NO. 9), preparing a double-stranded DNA fragment comprising a DNA sequence 5'-ACACTTCTGGTTTTTCTCATGCGCTTCTCACTCTCAGTATATTTTGCTGCTTTCCTTCATATGTATATATATCTATTTACATATTAGTTTACAGAACTTTAGCAACGAAACTAGACGTCCAATCTGCTGTTGCTATACTGGACTTTTGTACTCTTGTAAACAATCTTATATAGCATCCTGAAATACGTAGTAATTTTGTC-3' (SEQ ID NO. 10) and a complementary DNA thereof, and transforming the plasmid with both of them using S accharomyces cerevisiae 24-51-78 (accession No.: FERM BP-19072) as a host. In this GLR1 disrupted strain, a part or all of the coding region of the GLR1 gene encoding the amino acid sequence represented by SEQ ID NO. 1 in the genomic DNA of the host yeast was disrupted.

Production example 2 preparation of Yeast in which GLR1 Gene was disrupted and the expression of YCF1, GSH1 and GSH2 were enhanced (disruption of GLR1 + YCF1 enhancement + GSH1 enhancement + GSH2 enhancement Strain)

Using the GLR1 disrupted strain prepared in production example 1 as a host, a GLR1 disrupted + GSH1 enhanced + GSH2 enhanced strain was obtained by enhancing the expression of γ -glutamylcysteine synthetase (GSH1) consisting of the amino acid sequence shown in SEQ ID NO. 3 and glutathione synthetase (GSH2) consisting of the amino acid sequence shown in SEQ ID NO.5 by the method described in non-patent literature (Hara KY, Kiriyama K, Inagaki A, Nakayama H, Kondo A. (2012) Improvement of glutathione production by metabolic engineering of the surfactant enzyme. The enhancement of the expression of GSH1 and GSH2 described in the above non-patent documents is achieved by introducing multiple copies of each of the GSH1 gene controllably linked to a strong expression promoter and the GSH2 gene controllably linked to a strong expression promoter into the genomic DNA of a host yeast. Further, PCR amplification was carried out using genomic DNA of Saccharomyces cerevisiae strain Y PH499 as a template and 5'-AAAAGGATCCATGGCTGGTA ATCTTGTTTCATGGGCC-3' (SEQ ID NO: 11) and 5'-AAAACTCGAGTTAATTTTCA TTGACCAAACCAGCCTCC-3' (SEQ ID NO: 12) as primers, and the amplification product was digested with Ba mHI and XhoI to obtain a BamHI-XhoI fragment of a glutathione transferase (YCF1) gene encoding the amino acid sequence shown in SEQ ID NO. 7 and including the base sequence shown in SEQ ID NO. 8. This fragment was ligated to the BamHI-XhoI digestion site of p427TEF (manufactured by Cosmo Bio Inc.) to obtain YCF1 expression plasmid p427-YCF 1. The GLR 1-disrupted + GSH 1-enhanced + GSH 2-enhanced strain obtained above was further transformed using this plasmid (GLR 1-disrupted + YCF 1-enhanced + GSH 1-enhanced + GSH 2-enhanced strain).

[ example 1]

As a yeast, the strain GLR1 disrupted + YCF1 enhanced + GSH1 enhanced + GSH2 enhanced as described in production example 2 was cultured in YPD medium (10g/L yeast extract (manufactured by Difco laboratories Inc.), 20g/L polypeptone (manufactured by Wako pure chemical industries, Ltd.), and 20g/L glucose (manufactured by Nacalai tesque Inc.)) 7ml at 30 ℃ for 16 to 24 hours with shaking.

Then, 50ml of molasses lysine medium (molasses 4% (based on glucose in molasses), urea 0.3%, ammonium sulfate 0.08%, phosphoric acid 2%, ammonium 0.04%, lysine 0.1%, 0.2% or 0.4%) was inoculated into a sakaguchi flask so that the volume of the seed culture was 3ml, and the seed culture was cultured at 30 ℃ and 130rpm with stirring for 40 hours, whereby 1ml of the culture was recovered. In addition, 50ml of molasses culture medium (4% molasses (based on the amount of glucose in molasses), 0.3% urea, 0.08% ammonium sulfate, 2% phosphoric acid, 0.04% ammonium) was used as a comparative control for culturing.

The cells collected by centrifugation of 1ml of the culture solution were washed 2 times with sterile water and heat-treated at 80 ℃ for 5 minutes to elute glutathione from the cells. The eluate was centrifuged at 25 ℃ and 20000Xg for 5 minutes, and the glutathione concentration of the obtained supernatant was analyzed by HPLC to determine the amount of reduced Glutathione (GSH) and the amount of oxidized glutathione (GSSG) per 1ml of the culture medium. Similarly, 1ml of the culture solution was washed 2 times with sterile water and left to stand overnight in a desiccator at 80 ℃ to obtain a dry cell weight per 1ml of the culture solution. The GSH content (%) and the GSSG content (%) were calculated by dividing the GSH content and the GSSG content by the weight of the dry microbial cells, respectively. The GSH content (%) in the comparative control test using the molasses medium without added lysine was set to 100%, and the relative values of the GSSG content (%) in the comparative control test using the molasses medium and the GSH content (%) and GSSG content (%) in the test of example 1 using the molasses lysine medium were determined. The results are shown in the following table.

TABLE 1

As can be seen from the table, the GSH content and the GSSG content can be significantly increased by increasing the lysine concentration in the medium.

[ example 2]

Then, 50ml of a molasses arginine medium (molasses 4% (based on glucose in molasses), urea 0.3%, ammonium sulfate 0.08%, phosphoric acid 2%, ammonium 0.04%, and arginine 0.1%) was inoculated into a sakaguchi flask so that the volume of the seed culture medium was 3ml, and the seed culture medium was cultured at 30 ℃ under stirring at 130rpm for 40 hours, whereby 1ml of the culture medium was recovered. In addition, 50ml of molasses culture medium (molasses (based on glucose in molasses)) 4%, urea 0.3%, ammonium sulfate 0.08%, phosphoric acid 2%, and ammonium 0.04% were used as comparative controls, and the culture was performed.

The cells collected by centrifugation of 1ml of the culture solution were washed 2 times with sterile water and heat-treated at 80 ℃ for 5 minutes to elute glutathione from the cells. The eluate was centrifuged at 25 ℃ and 20000Xg for 5 minutes, and the glutathione concentration of the obtained supernatant was analyzed by HPLC to determine the amount of glutathione per 1ml of the culture medium (total amount of GSH and GSSG). Similarly, 1ml of the culture solution was washed 2 times with sterile water and left to stand overnight in a desiccator at 80 ℃ to obtain a dry cell weight per 1ml of the culture solution. The glutathione content (%) was calculated by dividing the amount of glutathione by the weight of the dried cells. The glutathione content (%) in the comparative control test using the molasses medium without arginine was set to 100%, and the relative value of the glutathione content (%) in the test of example 2 using the molasses arginine medium was determined. The results are shown in the following table.

TABLE 2

	Culture medium	Relative value of glutathione content
			Comparative control	Molasses culture medium	100％
Example 2	Molasses arginine culture medium	111％

As is clear from the table, the glutathione content of yeast can be significantly increased by adding arginine to the molasses medium.

[ example 3]

In example 2, the glutathione content (%) was measured by culturing the GLR1 disrupted + YCF 1-enhanced + GSH 1-enhanced + GSH 2-enhanced strain prepared in production example 2 in a molasses histidine medium and a molasses histidine-free molasses medium under the same conditions and in the same procedure as in example 2 except that 50ml of a molasses histidine medium (4% of molasses, based on the amount of glucose in molasses), 0.3% of urea, 0.08% of ammonium sulfate, 2% of phosphoric acid, 0.04% of ammonium, and 0.1% of histidine) was used instead of the molasses arginine medium. The glutathione content (%) in the comparative control test using a molasses culture medium without histidine addition was set to 100% as in example 2, and the relative value of the glutathione content (%) in the test of example 3 using a molasses histidine culture medium was determined.

TABLE 3

	Culture medium	Relative value of glutathione content
			Comparative control	Molasses culture medium	100％
Example 3	Molasses histidine culture medium	105％

The glutathione content of yeast can be significantly increased by culturing in molasses medium supplemented with histidine, as with arginine and lysine.

[ example 4]

Saccharomyces cerevisiae 24-51-78 (accession number: FERM BP-19072) was cultured as a yeast by shaking 7ml of YPD medium (10g/L yeast extract (manufactured by Difco laboratories), 20g/L polypeptone (manufactured by Wako pure chemical industries, Ltd.), and 20g/L glucose (manufactured by Nacalai tesque)) at 30 ℃ for 16 to 24 hours.

Next, 50ml of a molasses lysine medium (molasses 4% (based on glucose in molasses), urea 0.3%, ammonium sulfate 0.08%, phosphoric acid 2%, ammonium 0.04%, lysine 0.1%), a molasses arginine medium (having the same composition as the molasses lysine medium except that it contains 0.1% arginine instead of 0.1% lysine), or a molasses histidine medium (having the same composition as the molasses lysine medium except that it contains 0.1% histidine instead of 0.1% lysine) was inoculated into a sakaguchi flask so that the seed culture broth became 3ml, and the culture was carried out at 30 ℃ under stirring at 130rpm for 40 hours, whereby 1ml of the culture broth was recovered. In addition, 50ml of molasses culture medium (molasses (based on glucose in molasses)) 4%, urea 0.3%, ammonium sulfate 0.08%, phosphoric acid 2%, and ammonium 0.04% were used as comparative controls, and the culture was performed.

The glutathione content (%) of the culture in each medium was measured according to the procedure described in example 2. The glutathione content (%) in the comparative control test using the molasses medium without addition of lysine, arginine and histidine was set to 100% as in example 2, and the relative value of the glutathione content (%) in the test of example 4 using the molasses lysine medium, the molasses arginine medium or the molasses histidine medium was determined.

TABLE 4

	Culture medium	Relative value of glutathione content
			Comparative control	Molasses culture medium	100％
Example 4	Molasses lysine culture medium	106％
			Example 4	Molasses arginine culture medium	105％
Example 4	Molasses histidine culture medium	105％

When Saccharomyces cerevisiae 24-51-78 (accession number: FERM BP-19072) as a yeast was cultured in a medium to which a basic amino acid was added, the glutathione content of the yeast was also significantly increased.

All publications, patents and patent applications cited in this specification are herein incorporated by reference as if fully set forth.

Sequence listing

<110> Kaneka Corporation

<120> method for producing glutathione

<130> B180414

<150> JP 2018-167655

<151> 2018-09-07

<160> 12

<170> PatentIn version 3.5

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agtaaaaata acttgcatgt gggctccagg tctgtccctt tgacgctgac tgtcttcccg 480

aggatgggat gccccgactt tattaacatt aaggatccgt ggaatcataa aaatgccgct 540

tccaggtctc tgtttttacc cgatgaagtc attaacagac atgtcaggtt tcctaacttg 600

acagcatcca tcaggaccag gcgtggtgaa aaagtttgca tgaatgttcc catgtataaa 660

gatatagcta ctccagaaac ggatgactcc atctacgatc gagattggtt tttaccagaa 720

gacaaagagg cgaaactggc ttccaaaccg ggtttcattt atatggattc catgggtttt 780

ggcatgggct gttcgtgctt acaagtgacc tttcaggcac ccaatatcaa caaggcacgt 840

tacctgtacg atgcattagt gaattttgca cctataatgc tagccttctc tgccgctgcg 900

cctgctttta aaggttggct agccgaccaa gatgttcgtt ggaatgtgat atctggtgcg 960

gtggacgacc gtactccgaa ggaaagaggt gttgcgccat tactacccaa atacaacaag 1020

aacggatttg gaggcattgc caaagacgta caagataaag tccttgaaat accaaagtca 1080

agatatagtt cggttgatct tttcttgggt gggtcgaaat ttttcaatag gacttataac 1140

gacacaaatg tacctattaa tgaaaaagta ttaggacgac tactagagaa tgataaggcg 1200

ccactggact atgatcttgc taaacatttt gcgcatctct acataagaga tccagtatct 1260

acattcgaag aactgttgaa tcaggacaac aaaacgtctt caaatcactt tgaaaacatc 1320

caaagtacaa attggcagac attacgtttt aaacccccca cacaacaagc aaccccggac 1380

aaaaaggatt ctcctggttg gagagtggaa ttcagaccat ttgaagtgca actattagat 1440

tttgagaacg ctgcgtattc cgtgctcata tacttgattg tcgatagcat tttgaccttt 1500

tccgataata ttaacgcata tattcatatg tccaaagtat gggaaaatat gaagatagcc 1560

catcacagag atgctatcct atttgaaaaa tttcattgga aaaaatcatt tcgcaacgac 1620

accgatgtgg aaactgaaga ttattctata agcgagattt tccataatcc agagaatggt 1680

atatttcctc aatttgttac gccaatccta tgccaaaaag ggtttgtaac caaagattgg 1740

aaagaattaa agcattcttc caaacacgag agactatact attatttaaa gctaatttct 1800

gatagagcaa gcggtgaatt gccaacaaca gcaaaattct ttagaaattt tgtactacaa 1860

catccagatt acaaacatga ttcaaaaatt tcaaagtcga tcaattatga tttgctttct 1920

acgtgtgata gacttaccca tttagacgat tcaaaaggtg aattgacatc ctttttagga 1980

gctgaaattg cagaatatgt aaaaaaaaat aagccttcaa tagaaagcaa atgttaa 2037

<210> 5

<211> 491

<212> PRT

<213> Saccharomyces cerevisiae

<400> 5

Met Ala His Tyr Pro Pro Ser Lys Asp Gln Leu Asn Glu Leu Ile Gln

1 5 10 15

Glu Val Asn Gln Trp Ala Ile Thr Asn Gly Leu Ser Met Tyr Pro Pro

20 25 30

Lys Phe Glu Glu Asn Pro Ser Asn Ala Ser Val Ser Pro Val Thr Ile

35 40 45

Tyr Pro Thr Pro Ile Pro Arg Lys Cys Phe Asp Glu Ala Val Gln Ile

50 55 60

Gln Pro Val Phe Asn Glu Leu Tyr Ala Arg Ile Thr Gln Asp Met Ala

65 70 75 80

Gln Pro Asp Ser Tyr Leu His Lys Thr Thr Glu Ala Leu Ala Leu Ser

85 90 95

Asp Ser Glu Phe Thr Gly Lys Leu Trp Ser Leu Tyr Leu Ala Thr Leu

100 105 110

Lys Ser Ala Gln Tyr Lys Lys Gln Asn Phe Arg Leu Gly Ile Phe Arg

115 120 125

Ser Asp Tyr Leu Ile Asp Lys Lys Lys Gly Thr Glu Gln Ile Lys Gln

130 135 140

Val Glu Phe Asn Thr Val Ser Val Ser Phe Ala Gly Leu Ser Glu Lys

145 150 155 160

Val Asp Arg Leu His Ser Tyr Leu Asn Arg Ala Asn Lys Tyr Asp Pro

165 170 175

Lys Gly Pro Ile Tyr Asn Asp Gln Asn Met Val Ile Ser Asp Ser Gly

180 185 190

Tyr Leu Leu Ser Lys Ala Leu Ala Lys Ala Val Glu Ser Tyr Lys Ser

195 200 205

Gln Gln Ser Ser Ser Thr Thr Ser Asp Pro Ile Val Ala Phe Ile Val

210 215 220

Gln Arg Asn Glu Arg Asn Val Phe Asp Gln Lys Val Leu Glu Leu Asn

225 230 235 240

Leu Leu Glu Lys Phe Gly Thr Lys Ser Val Arg Leu Thr Phe Asp Asp

245 250 255

Val Asn Asp Lys Leu Phe Ile Asp Asp Lys Thr Gly Lys Leu Phe Ile

260 265 270

Arg Asp Thr Glu Gln Glu Ile Ala Val Val Tyr Tyr Arg Thr Gly Tyr

275 280 285

Thr Thr Thr Asp Tyr Thr Ser Glu Lys Asp Trp Glu Ala Arg Leu Phe

290 295 300

Leu Glu Lys Ser Phe Ala Ile Lys Ala Pro Asp Leu Leu Thr Gln Leu

305 310 315 320

Ser Gly Ser Lys Lys Ile Gln Gln Leu Leu Thr Asp Glu Gly Val Leu

325 330 335

Gly Lys Tyr Ile Ser Asp Ala Glu Lys Lys Ser Ser Leu Leu Lys Thr

340 345 350

Phe Val Lys Ile Tyr Pro Leu Asp Asp Thr Lys Leu Gly Arg Glu Gly

355 360 365

Lys Arg Leu Ala Leu Ser Glu Pro Ser Lys Tyr Val Leu Lys Pro Gln

370 375 380

Arg Glu Gly Gly Gly Asn Asn Val Tyr Lys Glu Asn Ile Pro Asn Phe

385 390 395 400

Leu Lys Gly Ile Glu Glu Arg His Trp Asp Ala Tyr Ile Leu Met Glu

405 410 415

Leu Ile Glu Pro Glu Leu Asn Glu Asn Asn Ile Ile Leu Arg Asp Asn

420 425 430

Lys Ser Tyr Asn Glu Pro Ile Ile Ser Glu Leu Gly Ile Tyr Gly Cys

435 440 445

Val Leu Phe Asn Asp Glu Gln Val Leu Ser Asn Glu Phe Ser Gly Ser

450 455 460

Leu Leu Arg Ser Lys Phe Asn Thr Ser Asn Glu Gly Gly Val Ala Ala

465 470 475 480

Gly Phe Gly Cys Leu Asp Ser Ile Ile Leu Tyr

485 490

<210> 6

<211> 1476

<212> DNA

<213> Saccharomyces cerevisiae

<400> 6

atggcacact atccaccttc caaggatcaa ttgaatgaat tgatccagga agttaaccaa 60

tgggctatca ctaatggatt atccatgtat cctcctaaat tcgaggagaa cccatcaaat 120

gcatcggtgt caccagtaac tatctatcca accccaattc ctaggaaatg ttttgatgag 180

gccgttcaaa tacaaccggt attcaatgaa ttatacgccc gtattaccca agatatggcc 240

caacctgatt cttatttaca taaaacaact gaagcgttag ctctatcaga ttccgagttt 300

actggaaaac tgtggtctct ataccttgct accttaaaat ctgcacagta caaaaagcag 360

aattttaggc taggtatatt tagatcagat tatttgattg ataagaaaaa gggtactgaa 420

cagattaagc aagtcgagtt taatacagtg tcagtgtcat ttgcaggcct tagcgagaaa 480

gttgatagat tgcactctta tttaaatagg gcaaacaagt acgatcctaa aggaccaatt 540

tataatgatc aaaatatggt catttctgat tcaggatacc ttttgtctaa ggcattggcc 600

aaagctgtgg aatcgtataa gtcacaacaa agttcttcta caactagtga tcctattgtc 660

gcattcattg tgcaaagaaa cgagagaaat gtgtttgatc aaaaggtctt ggaattgaat 720

ctgttggaaa aattcggtac caaatctgtt aggttgacgt ttgatgatgt taacgataaa 780

ttgttcattg atgataaaac gggaaagctt ttcattaggg acacagagca ggaaatagcg 840

gtggtttatt acagaacggg ttacacaacc actgattaca cgtccgaaaa ggactgggag 900

gcaagactat tcctcgaaaa aagtttcgca ataaaggccc cagatttact cactcaatta 960

tctggctcca agaaaattca gcaattgttg acagatgagg gcgtattagg taaatacatc 1020

tccgatgctg agaaaaagag tagtttgtta aaaacttttg tcaaaatata tcccttggat 1080

gatacgaagc ttggcaggga aggcaagagg ctggcattaa gtgagccctc taaatacgtg 1140

ttaaaaccac agcgggaagg tggcggaaac aatgtttata aagaaaatat tcctaatttt 1200

ttgaaaggta tcgaagaacg tcactgggat gcatatattc tcatggagtt gattgaacca 1260

gagttgaatg aaaataatat tatattacgt gataacaaat cttacaacga accaatcatc 1320

agtgaactag gaatttatgg ttgcgttcta tttaacgacg agcaagtttt atcgaacgaa 1380

tttagtggct cattactaag atccaaattt aatacttcaa atgaaggtgg agtggcggca 1440

ggattcggat gtttggacag tattattctt tactag 1476

<210> 7

<211> 1515

<212> PRT

<213> Saccharomyces cerevisiae

<400> 7

Met Ala Gly Asn Leu Val Ser Trp Ala Cys Lys Leu Cys Arg Ser Pro

1 5 10 15

Glu Gly Phe Gly Pro Ile Ser Phe Tyr Gly Asp Phe Thr Gln Cys Phe

20 25 30

Ile Asp Gly Val Ile Leu Asn Leu Ser Ala Ile Phe Met Ile Thr Phe

35 40 45

Gly Ile Arg Asp Leu Val Asn Leu Cys Lys Lys Lys His Ser Gly Ile

50 55 60

Lys Tyr Arg Arg Asn Trp Ile Ile Val Ser Arg Met Ala Leu Val Leu

65 70 75 80

Leu Glu Ile Ala Phe Val Ser Leu Ala Ser Leu Asn Ile Ser Lys Glu

85 90 95

Glu Ala Glu Asn Phe Thr Ile Val Ser Gln Tyr Ala Ser Thr Met Leu

100 105 110

Ser Leu Phe Val Ala Leu Ala Leu His Trp Ile Glu Tyr Asp Arg Ser

115 120 125

Val Val Ala Asn Thr Val Leu Leu Phe Tyr Trp Leu Phe Glu Thr Phe

130 135 140

Gly Asn Phe Ala Lys Leu Ile Asn Ile Leu Ile Arg His Thr Tyr Glu

145 150 155 160

Gly Ile Trp Tyr Ser Gly Gln Thr Gly Phe Ile Leu Thr Leu Phe Gln

165 170 175

Val Ile Thr Cys Ala Ser Ile Leu Leu Leu Glu Ala Leu Pro Lys Lys

180 185 190

Pro Leu Met Pro His Gln His Ile His Gln Thr Leu Thr Arg Arg Lys

195 200 205

Pro Asn Pro Tyr Asp Ser Ala Asn Ile Phe Ser Arg Ile Thr Phe Ser

210 215 220

Trp Met Ser Gly Leu Met Lys Thr Gly Tyr Glu Lys Tyr Leu Val Glu

225 230 235 240

Ala Asp Leu Tyr Lys Leu Pro Arg Asn Phe Ser Ser Glu Glu Leu Ser

245 250 255

Gln Lys Leu Glu Lys Asn Trp Glu Asn Glu Leu Lys Gln Lys Ser Asn

260 265 270

Pro Ser Leu Ser Trp Ala Ile Cys Arg Thr Phe Gly Ser Lys Met Leu

275 280 285

Leu Ala Ala Phe Phe Lys Ala Ile His Asp Val Leu Ala Phe Thr Gln

290 295 300

Pro Gln Leu Leu Arg Ile Leu Ile Lys Phe Val Thr Asp Tyr Asn Ser

305 310 315 320

Glu Arg Gln Asp Asp His Ser Ser Leu Gln Gly Phe Glu Asn Asn His

325 330 335

Pro Gln Lys Leu Pro Ile Val Arg Gly Phe Leu Ile Ala Phe Ala Met

340 345 350

Phe Leu Val Gly Phe Thr Gln Thr Ser Val Leu His Gln Tyr Phe Leu

355 360 365

Asn Val Phe Asn Thr Gly Met Tyr Ile Lys Ser Ala Leu Thr Ala Leu

370 375 380

Ile Tyr Gln Lys Ser Leu Val Leu Ser Asn Glu Ala Ser Gly Leu Ser

385 390 395 400

Ser Thr Gly Asp Ile Val Asn Leu Met Ser Val Asp Val Gln Lys Leu

405 410 415

Gln Asp Leu Thr Gln Trp Leu Asn Leu Ile Trp Ser Gly Pro Phe Gln

420 425 430

Ile Ile Ile Cys Leu Tyr Ser Leu Tyr Lys Leu Leu Gly Asn Ser Met

435 440 445

Trp Val Gly Val Ile Ile Leu Val Ile Met Met Pro Leu Asn Ser Phe

450 455 460

Leu Met Arg Ile Gln Lys Lys Leu Gln Lys Ser Gln Met Lys Tyr Lys

465 470 475 480

Asp Glu Arg Thr Arg Val Ile Ser Glu Ile Leu Asn Asn Ile Lys Ser

485 490 495

Leu Lys Leu Tyr Ala Trp Glu Lys Pro Tyr Arg Glu Lys Leu Glu Glu

500 505 510

Val Arg Asn Asn Lys Glu Leu Lys Asn Leu Thr Lys Leu Gly Cys Tyr

515 520 525

Met Ala Val Thr Ser Phe Gln Phe Asn Ile Val Pro Phe Leu Val Ser

530 535 540

Cys Cys Thr Phe Ala Val Phe Val Tyr Thr Glu Asp Arg Ala Leu Thr

545 550 555 560

Thr Asp Leu Val Phe Pro Ala Leu Thr Leu Phe Asn Leu Leu Ser Phe

565 570 575

Pro Leu Met Ile Ile Pro Met Val Leu Asn Ser Phe Ile Glu Ala Ser

580 585 590

Val Ser Ile Gly Arg Leu Phe Thr Phe Phe Thr Asn Glu Glu Leu Gln

595 600 605

Pro Asp Ser Val Gln Arg Leu Pro Lys Val Lys Asn Ile Gly Asp Val

610 615 620

Ala Ile Asn Ile Gly Asp Asp Ala Thr Phe Leu Trp Gln Arg Lys Pro

625 630 635 640

Glu Tyr Lys Val Ala Leu Lys Asn Ile Asn Phe Gln Ala Lys Lys Gly

645 650 655

Asn Leu Thr Cys Ile Val Gly Lys Val Gly Ser Gly Lys Thr Ala Leu

660 665 670

Leu Ser Cys Met Leu Gly Asp Leu Phe Arg Val Lys Gly Phe Ala Thr

675 680 685

Val His Gly Ser Val Ala Tyr Val Ser Gln Val Pro Trp Ile Met Asn

690 695 700

Gly Thr Val Lys Glu Asn Ile Leu Phe Gly His Arg Tyr Asp Ala Glu

705 710 715 720

Phe Tyr Glu Lys Thr Ile Lys Ala Cys Ala Leu Thr Ile Asp Leu Ala

725 730 735

Ile Leu Met Asp Gly Asp Lys Thr Leu Val Gly Glu Lys Gly Ile Ser

740 745 750

Leu Ser Gly Gly Gln Lys Ala Arg Leu Ser Leu Ala Arg Ala Val Tyr

755 760 765

Ala Arg Ala Asp Thr Tyr Leu Leu Asp Asp Pro Leu Ala Ala Val Asp

770 775 780

Glu His Val Ala Arg His Leu Ile Glu His Val Leu Gly Pro Asn Gly

785 790 795 800

Leu Leu His Thr Lys Thr Lys Val Leu Ala Thr Asn Lys Val Ser Ala

805 810 815

Leu Ser Ile Ala Asp Ser Ile Ala Leu Leu Asp Asn Gly Glu Ile Thr

820 825 830

Gln Gln Gly Thr Tyr Asp Glu Ile Thr Lys Asp Ala Asp Ser Pro Leu

835 840 845

Trp Lys Leu Leu Asn Asn Tyr Gly Lys Lys Asn Asn Gly Lys Ser Asn

850 855 860

Glu Phe Gly Asp Ser Ser Glu Ser Ser Val Arg Glu Ser Ser Ile Pro

865 870 875 880

Val Glu Gly Glu Leu Glu Gln Leu Gln Lys Leu Asn Asp Leu Asp Phe

885 890 895

Gly Asn Ser Asp Ala Ile Ser Leu Arg Arg Ala Ser Asp Ala Thr Leu

900 905 910

Gly Ser Ile Asp Phe Gly Asp Asp Glu Asn Ile Ala Lys Arg Glu His

915 920 925

Arg Glu Gln Gly Lys Val Lys Trp Asn Ile Tyr Leu Glu Tyr Ala Lys

930 935 940

Ala Cys Asn Pro Lys Ser Val Cys Val Phe Ile Leu Phe Ile Val Ile

945 950 955 960

Ser Met Phe Leu Ser Val Met Gly Asn Val Trp Leu Lys His Trp Ser

965 970 975

Glu Val Asn Ser Arg Tyr Gly Ser Asn Pro Asn Ala Ala Arg Tyr Leu

980 985 990

Ala Ile Tyr Phe Ala Leu Gly Ile Gly Ser Ala Leu Ala Thr Leu Ile

995 1000 1005

Gln Thr Ile Val Leu Trp Val Phe Cys Thr Ile His Ala Ser Lys

1010 1015 1020

Tyr Leu His Asn Leu Met Thr Asn Ser Val Leu Arg Ala Pro Met

1025 1030 1035

Thr Phe Phe Glu Thr Thr Pro Ile Gly Arg Ile Leu Asn Arg Phe

1040 1045 1050

Ser Asn Asp Ile Tyr Lys Val Asp Ala Leu Leu Gly Arg Thr Phe

1055 1060 1065

Ser Gln Phe Phe Val Asn Ala Val Lys Val Thr Phe Thr Ile Thr

1070 1075 1080

Val Ile Cys Ala Thr Thr Trp Gln Phe Ile Phe Ile Ile Ile Pro

1085 1090 1095

Leu Ser Val Phe Tyr Ile Tyr Tyr Gln Gln Tyr Tyr Leu Arg Thr

1100 1105 1110

Ser Arg Glu Leu Arg Arg Leu Asp Ser Ile Thr Arg Ser Pro Ile

1115 1120 1125

Tyr Ser His Phe Gln Glu Thr Leu Gly Gly Leu Ala Thr Val Arg

1130 1135 1140

Gly Tyr Ser Gln Gln Lys Arg Phe Ser His Ile Asn Gln Cys Arg

1145 1150 1155

Ile Asp Asn Asn Met Ser Ala Phe Tyr Pro Ser Ile Asn Ala Asn

1160 1165 1170

Arg Trp Leu Ala Tyr Arg Leu Glu Leu Ile Gly Ser Ile Ile Ile

1175 1180 1185

Leu Gly Ala Ala Thr Leu Ser Val Phe Arg Leu Lys Gln Gly Thr

1190 1195 1200

Leu Thr Ala Gly Met Val Gly Leu Ser Leu Ser Tyr Ala Leu Gln

1205 1210 1215

Ile Thr Gln Thr Leu Asn Trp Ile Val Arg Met Thr Val Glu Val

1220 1225 1230

Glu Thr Asn Ile Val Ser Val Glu Arg Ile Lys Glu Tyr Ala Asp

1235 1240 1245

Leu Lys Ser Glu Ala Pro Leu Ile Val Glu Gly His Arg Pro Pro

1250 1255 1260

Lys Glu Trp Pro Ser Gln Gly Asp Ile Lys Phe Asn Asn Tyr Ser

1265 1270 1275

Thr Arg Tyr Arg Pro Glu Leu Asp Leu Val Leu Lys His Ile Asn

1280 1285 1290

Ile His Ile Lys Pro Asn Glu Lys Val Gly Ile Val Gly Arg Thr

1295 1300 1305

Gly Ala Gly Lys Ser Ser Leu Thr Leu Ala Leu Phe Arg Met Ile

1310 1315 1320

Glu Ala Ser Glu Gly Asn Ile Val Ile Asp Asn Ile Ala Ile Asn

1325 1330 1335

Glu Ile Gly Leu Tyr Asp Leu Arg His Lys Leu Ser Ile Ile Pro

1340 1345 1350

Gln Asp Ser Gln Val Phe Glu Gly Thr Val Arg Glu Asn Ile Asp

1355 1360 1365

Pro Ile Asn Gln Tyr Thr Asp Glu Ala Ile Trp Arg Ala Leu Glu

1370 1375 1380

Leu Ser His Leu Lys Glu His Val Leu Ser Met Ser Asn Asp Gly

1385 1390 1395

Leu Asp Ala Gln Leu Thr Glu Gly Gly Gly Asn Leu Ser Val Gly

1400 1405 1410

Gln Arg Gln Leu Leu Cys Leu Ala Arg Ala Met Leu Val Pro Ser

1415 1420 1425

Lys Ile Leu Val Leu Asp Glu Ala Thr Ala Ala Val Asp Val Glu

1430 1435 1440

Thr Asp Lys Val Val Gln Glu Thr Ile Arg Thr Ala Phe Lys Asp

1445 1450 1455

Arg Thr Ile Leu Thr Ile Ala His Arg Leu Asn Thr Ile Met Asp

1460 1465 1470

Ser Asp Arg Ile Ile Val Leu Asp Asn Gly Lys Val Ala Glu Phe

1475 1480 1485

Asp Ser Pro Gly Gln Leu Leu Ser Asp Asn Lys Ser Leu Phe Tyr

1490 1495 1500

Ser Leu Cys Met Glu Ala Gly Leu Val Asn Glu Asn

1505 1510 1515

<210> 8

<211> 4548

<212> DNA

<213> Saccharomyces cerevisiae

<400> 8

atggctggta atcttgtttc atgggcctgc aagctctgta gatctcctga agggtttgga 60

cctatatcct tttacggtga ctttactcaa tgcttcatcg acggtgtgat cctaaatcta 120

tcagcaattt tcatgataac cttcggtatc agagatttag ttaacctttg caagaaaaaa 180

cactctggca tcaaatatag gcggaattgg attattgtct ctaggatggc actagttctg 240

ttggagatag cgtttgtttc acttgcgtct ttaaatattt ctaaagaaga agcggaaaac 300

tttaccattg taagtcaata tgcttctaca atgttatctt tatttgttgc tttagcctta 360

cactggatag aatacgatag atcagttgta gccaatacgg tacttttatt ctattggctt 420

tttgaaacat tcggtaattt tgctaaacta ataaatattc taattagaca cacctacgaa 480

ggcatttggt attccggaca aacgggtttc atactaacgt tattccaagt aataacatgt 540

gccagtatcc tgttacttga agctcttcca aagaagccgc taatgccaca tcaacacata 600

catcaaactt taacaagaag aaaaccaaat ccatacgata gcgcaaacat attttccagg 660

attaccttct cttggatgtc aggtttgatg aaaactggct atgaaaaata cttagtggaa 720

gcagatttat ataaattacc gaggaacttt agtagtgaag aactctctca aaaattggag 780

aaaaactggg aaaatgagtt gaagcaaaaa tcaaatcctt cattatcatg ggctatatgc 840

agaacttttg gatctaaaat gcttttagcc gcattcttta aagcaattca tgatgttcta 900

gcatttactc aaccacaact actaaggatt ttaatcaagt tcgtcacaga ctataacagt 960

gagagacagg atgaccattc ttctcttcaa gggtttgaaa ataaccaccc acaaaaatta 1020

cccattgtaa gagggttttt gattgcgttt gctatgtttc tggtgggctt tactcagaca 1080

tctgtcctgc atcaatattt cctgaatgtc ttcaacacag gcatgtatat taagagcgcc 1140

ctaacggctt taatatatca aaaatcctta gtgctatcta atgaggcttc tggactttcc 1200

tctaccggtg acattgtcaa tctcatgagt gtggatgttc aaaaattaca agatttaaca 1260

caatggctaa atttaatatg gtcagggcct tttcaaatca ttatttgctt atattctctg 1320

tataagttgt tgggaaattc catgtgggtt ggcgtgatta tactagttat tatgatgcca 1380

ttgaactcat ttttgatgag gatacaaaag aagttgcaaa aatcccagat gaagtacaaa 1440

gatgaaagga cccgtgttat aagtgaaata ctaaacaata ttaaatcttt gaagttatat 1500

gcatgggaga agccttatag ggaaaagcta gaagaagtaa gaaataacaa agagttaaaa 1560

aatcttacaa aactaggatg ttatatggct gtgacaagtt ttcagttcaa tatagtacca 1620

ttccttgttt catgttgtac ctttgctgta tttgtttata ctgaggatag agcattgact 1680

actgacttag ttttccctgc tttgactctg ttcaacctgc tctcattccc actaatgatt 1740

attcctatgg ttttaaattc ttttatcgaa gcttctgttt ctattggtag attatttaca 1800

ttctttacca atgaagagct acaaccagat tcggttcagc gtttaccaaa agtaaaaaat 1860

attggcgatg tagccattaa cattggagat gatgctacct ttttatggca acggaaaccg 1920

gaatacaaag tagccttaaa gaatattaat ttccaagcta aaaaaggaaa tttgacctgt 1980

attgttggta aagttggcag tggtaaaaca gctctattgt catgcatgtt aggtgatcta 2040

ttcagggtta aaggtttcgc caccgttcat ggttctgttg cttatgtttc acaagttcca 2100

tggataatga atggtactgt aaaggaaaac attttatttg ggcatagata cgacgcggaa 2160

ttttacgaaa aaacgatcaa ggcctgtgcg ttaactattg atcttgcaat tttgatggat 2220

ggagataaga cattagttgg cgagaaaggg atctccttat ctggaggaca aaaagctcgt 2280

ttgtctttag caagagcagt ttatgcgaga gctgacactt atttacttga tgatcctttg 2340

gcagctgttg atgaacacgt tgccaggcac ttgatcgaac atgtgttggg tccaaatggt 2400

ttattacata caaaaacgaa ggtattagcc actaataagg tgagcgcgtt atccatcgca 2460

gattctattg cattattaga taatggagaa atcacacagc agggtacata tgatgagatt 2520

acgaaggacg ctgattcgcc attatggaaa ttgctcaaca actatggtaa aaaaaataac 2580

ggtaagtcga atgaattcgg tgactcctct gaaagctcag ttcgagaaag tagtatacct 2640

gtagaaggag agctggaaca actgcagaaa ttaaatgatt tggattttgg caactctgac 2700

gccataagtt taaggagggc cagtgatgca actttgggaa gcatcgattt tggtgacgat 2760

gaaaatattg ctaaaagaga gcatcgtgaa cagggaaaag taaagtggaa catttaccta 2820

gagtacgcta aagcttgcaa cccgaaaagc gtttgtgtat tcatattgtt tattgttata 2880

tcgatgttcc tctctgttat gggtaacgtt tggttgaaac attggtctga agttaatagc 2940

cgctatggat ctaatccaaa tgccgcgcgt tacttggcca tttattttgc acttggtatt 3000

ggttcagcac tggcaacatt aatccagaca atcgttctct gggttttttg taccattcat 3060

gcctccaaat atttacacaa cttgatgaca aactctgtgt tgagagcccc aatgacgttt 3120

tttgaaacaa caccaatcgg tagaattcta aacagattct caaatgacat atacaaagtg 3180

gatgctttat taggaagaac attttctcag tttttcgtca atgcagtgaa agtcacattc 3240

actattacgg ttatctgtgc gacgacatgg caatttatct tcattatcat tccactaagt 3300

gtgttttaca tctactacca gcagtattac ctgagaacat caagggagtt gcgtcgttta 3360

gactctatta ctaggtctcc aatctactct catttccaag agactttggg tggccttgca 3420

acggttagag gttattctca acagaaaagg ttttcccaca ttaatcaatg ccgcattgat 3480

aataacatga gtgcgttcta tccctctatc aatgctaacc gttggctagc atataggttg 3540

gaacttattg gttcaattat cattctaggt gctgcaactt tatccgtttt tagactaaaa 3600

caaggcacat taacggcagg tatggtgggt ttatcattaa gctatgcttt acaaatcact 3660

caaacgttaa attggattgt tagaatgact gtggaagttg aaacgaatat tgtttcagtg 3720

gaaagaataa aggaatatgc tgatttgaag agcgaggcac ctttaatagt tgaaggccac 3780

agaccaccca aagaatggcc gagccagggt gatataaagt ttaataatta ttccactcgt 3840

tataggccgg agcttgatct tgttctgaag cacattaata tacacattaa accaaatgaa 3900

aaagttggta tcgtgggtag aacgggtgcg ggaaaatcct cattaacgct agcattattc 3960

aggatgattg aggctagcga gggaaacatc gtaatcgaca acattgccat caacgagatt 4020

gggttatatg atttgagaca taaattgtca atcatacctc aggattctca agtttttgag 4080

ggcactgttc gtgagaacat tgatcccatt aaccaataca ctgatgaagc tatttggagg 4140

gcattggaac tttctcattt gaaagaacac gtgctatcaa tgagcaatga cggattagat 4200

gcccaactaa ccgaaggtgg tggcaactta agtgttggac aaagacaatt attatgtctt 4260

gcaagagcaa tgttggttcc atcaaagatt ttggtgcttg atgaagccac ggccgcagtc 4320

gacgtggaga cagataaagt cgtccaagag acgattcgta ctgctttcaa ggacagaact 4380

atcttgacca tcgcgcatag actgaacacg ataatggaca gtgatagaat catagtgttg 4440

gacaatggta aagtagccga gtttgactct ccgggccagt tattaagtga taacaaatca 4500

ttgttctatt cactgtgcat ggaggctggt ttggtcaatg aaaattaa 4548

<210> 9

<211> 20

<212> DNA

<213> Artificial

<220>

<223> GLR1 gRNA

<400> 9

gattacctcg tcatcggggg 20

<210> 10

<211> 200

<212> DNA

<213> Artificial

<220>

<223> GLR1 rescue DNA

<400> 10

acacttctgg tttttctcat gcgcttctca ctctcagtat attttgctgc tttccttcat 60

atgtatatat atctatttac atattagttt acagaacttt agcaacgaaa ctagacgtcc 120

aatctgctgt tgctatactg gacttttgta ctcttgtaaa caatcttata tagcatcctg 180

aaatacgtag taattttgtc 200

<210> 11

<211> 37

<212> DNA

<213> Artificial

<220>

<223> PCR primer

<400> 11

aaaaggatcc atggctggta atcttgtttc atgggcc 37

<210> 12

<211> 38

<212> DNA

<213> Artificial

<220>

<223> PCR reverse primer

<400> 12

aaaactcgag ttaattttca ttgaccaaac cagcctcc 38

PCT/RO/134 Table

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