Applied Microbiology and Biotechnology

, Volume 94, Issue 5, pp 1313–1319 | Cite as

Improvement of glutathione production by metabolic engineering the sulfate assimilation pathway of Saccharomyces cerevisiae

  • Kiyotaka Y. Hara
  • Kentaro Kiriyama
  • Akiko Inagaki
  • Hideki Nakayama
  • Akihiko Kondo
Applied microbial and cell physiology

Abstract

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.

Keywords

Glutathione Yeast Saccharomyces cerevisiae Cysteine Sulfate 

Notes

Acknowledgments

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).

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Kiyotaka Y. Hara
    • 1
  • Kentaro Kiriyama
    • 2
  • Akiko Inagaki
    • 1
  • Hideki Nakayama
    • 3
  • Akihiko Kondo
    • 2
  1. 1.Organization of Advanced Science and TechnologyKobe UniversityKobeJapan
  2. 2.Department of Chemical Science and Engineering, Graduate School of EngineeringKobe UniversityKobeJapan
  3. 3.Graduate School of Fisheries Science and Environmental StudiesNagasaki UniversityNagasakiJapan

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