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J Biotechnol. 2013 Apr 15;164(4):454-60. doi: 10.1016/j.jbiotec.2013.01.007. Epub 2013 Feb 1.

Glutathione enhances 2-keto-l-gulonic acid production based on Ketogulonicigenium vulgare model iWZ663.

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  • 1State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China.

Abstract

Ketogulonicigenium vulgare is used widely during the industrial production of 2-keto-l-gulonic acid (2-KLG), the precursor of vitamin C, in a coculture with Bacillus megaterium. We analyzed the sulfate and coenzyme A metabolic module in the genome-scale metabolic model (GSMM) iWZ663 and found that the poor growth of K. vulgare was due to a deficiency in key reductases in the sulfate metabolic pathway. To carefully investigate the metabolism of sulfate, we developed a chemically defined medium (CDM) to produce pure cultures of K. vulgare. The addition of glutathione and l-cysteine to a flask culture of K. vulgare increased the cell growth, 2-KLG titer, and the intracellular coenzyme A level by 38.7%, 45.5%, and 85.3%, respectively, with glutathione, and by 25.6%, 35.8%, and 44.7%, respectively, with l-cysteine. The addition of glutathione to a 7-L fermenter culture of K. vulgare and B. megaterium increased the 2-KLG productivity by 20.9%. This study shows that the analysis of a specific metabolic module in GSMM can provide a potential strategy for optimizing microbial physiological functions.

Copyright © 2013 Elsevier B.V. All rights reserved.

PMID:
23376843
[PubMed - indexed for MEDLINE]
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