Improvement of glutathione production by metabolic engineering the sulfate assimilation pathway of Saccharomyces cerevisiae
- 953 Downloads
Glutathione (GSH) is a valuable tri-peptide that is widely used in the pharmaceutical, food, and cosmetic industries. Glutathione is produced industrially by fermentation using Saccharomyces cerevisiae. In this study, we demonstrated that engineering in sulfate assimilation metabolism can significantly improve GSH production. The intracellular GSH content of MET14 and MET16 over-expressing strains increased up to 1.2 and 1.4-fold higher than that of the parental strain, respectively, whereas those of APA1 and MET3 over-expressing strains decreased. Especially, in the MET16 over-expressing strain, the volumetric GSH concentration was up to 1.7-fold higher than that of the parental strain as a result of the synergetic effect of the increases in the cell concentration and the intracellular GSH content. Additionally, combinatorial mutant strains that had been engineered to contain both the sulfur and the GSH synthetic metabolism synergistically increased the GSH production. External addition of cysteine to S. cerevisiae is well known as a way to increase the intracellular GSH content; however, it results a decrease in cell growth. This study showed that the engineering of sulfur metabolism in S. cerevisiae proves more valuable than addition of cysteine as a way to boost GSH production due to the increases in both the intracellular GSH content and the cell growth.
KeywordsGlutathione Yeast Saccharomyces cerevisiae Cysteine Sulfate
We are grateful to Dr. J. Ishii (Organization of Advanced Science and Technology, Kobe University) for providing us with pGK402, pRS405, and pRS406 plasmids. We thank Dr. R. Yamada (Organization of Advanced Science and Technology, Kobe University) for providing us with the δ-integration plasmid. This study was supported by the Special Coordination Funds for Promoting Science and Technology, Creation of Innovation Centers for Advanced Interdisciplinary Research Areas (Innovative Bioproduction Kobe, iBioK), MEXT, Japan. Hara KY was supported by a Grant-in-Aid for Young Scientists (B) (22760608).
- Flohé L (1985) The glutathione peroxidase reaction: molecular basis of the antioxidant function of selenium in mammals. Curr Top Cell Regul 27:473–478Google Scholar
- Hara KY, Kim S, Yoshida H, Kiriyama K, Kondo T, Okai N, Ogino C, Fukuda H and Kondo A (2011) Development of a glutathione production process from proteinaceous biomass resources using protease-displaying Saccharomyces cerevisiae. Appl Microbiol Biotechnol. in pressGoogle Scholar
- Thomas D, Surdin-Kerjan Y (1997) Metabolism of sulfur amino acids in Saccharomyces cerevisiae. Microbiol Mol Biol Rev 61:503–532Google Scholar
- Vartanyan LS, Gurevich S, Kozachenko AI, Nagler LG, Lozovskaya EL, Burlakova EB (2000) Changes in superoxide production rate and in superoxide dismutase and glutathione peroxidase activities in subcellular organelles in mouse liver under exposure to low doses of low-intensity radiation. Biochem Mosc 65:442–446Google Scholar
- Yoshida K, Hariki T, Inoue H, Nakamura T (2002) External skin preparation for whitening. JP Patent 2, 002, 284, 664Google Scholar