Abstract
A stepwise control strategy for enhancing glutathione (GSH) synthesis in yeast based on oxidative stress and energy metabolism was investigated. First, molasses and corn steep liquor were selected and fed as carbon source mixture at a flow rate of 1.5 g/L/h and 0.4 g/L/h, respectively, for increasing cell density in a 10 L fermenter. When the biomass reached 90 g/L, the KMnO4 sustained-release particles, composed of 1.5% KMnO4, 3% stearic acid, 2% polyethylene glycol and 3% agar powder, were prepared and added to the fermentation broth for maintaining the oxidative stress. The results showed that the maximum GSH accumulation of the group fed KMnO4 sustained-release particles was 39.0% higher than that of KMnO4-fed group. In addition to the improved average GSH productivity and average specific production rate, the activities of GSH peroxidase, γ-glutamylcysteine synthetase and GSH reductase, enzymes taking part in GSH metabolism, were also significantly enhanced by KMnO4 sustained-release particles feeding. Finally, 6 g/L sodium citrate fed as an energy adjuvant elevated the intracellular ATP level for further enhancing GSH production. Through the above stepwise strategy, the GSH accumulation reached 5.76 g/L, which was 2.84-fold higher than that of the control group. The stepwise control strategy based on oxidative stress and energy metabolism significantly improved GSH accumulation in yeast.
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Acknowledgements
This study was sponsored by the Natural Science Foundation for Young Scientists of Jiangsu Province of China (No. BK20170592), and the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (17KJB180015), and the Open Funding Project of Jiangsu Key Laboratory of Chiral Pharmaceuticals Biosynthesis (No. SX1702), and the Research Initiation Project of Taizhou University (No. QD2016037).
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Chen, H., Cao, X., Zhu, N. et al. A stepwise control strategy for glutathione synthesis in Saccharomyces cerevisiae based on oxidative stress and energy metabolism. World J Microbiol Biotechnol 36, 117 (2020). https://doi.org/10.1007/s11274-020-02895-2
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DOI: https://doi.org/10.1007/s11274-020-02895-2