Effect of different carbon sources on pyruvic acid production by using lpdA gene knockout Escherichia coli.
- Author:
Dongqian SHEN
1
;
Xiaoyu FENG
;
Dongqiang LIN
;
Shanjing YAO
Author Information
1. Department of Chemical and Biochemical Engineering, Zhejiang University, Hangzhou 310027, China.
- Publication Type:Journal Article
- MeSH:
Carbon;
metabolism;
Dihydrolipoamide Dehydrogenase;
genetics;
Escherichia coli;
genetics;
metabolism;
Escherichia coli Proteins;
genetics;
Fermentation;
Fructose;
metabolism;
Gene Knockout Techniques;
Glucose;
metabolism;
Mannose;
metabolism;
Pyruvic Acid;
metabolism;
Xylose;
metabolism
- From:
Chinese Journal of Biotechnology
2009;25(9):1345-1351
- CountryChina
- Language:Chinese
-
Abstract:
We studied the ability of lpdA gene knockout Escherichia coli to ferment different sugars in mineral salts medium for the production of pyruvate. The sugars studied were glucose, fructose, xylose and mannose at a concentration of 10 g/L. At the same time, effect of inoculum size on lpdA fermentation with glucose was studied. The strain was able to use all sugars for biomass generation and pyruvate production. The lpdA knockout mutant converted glucose, fructose, xylose and mannose to pyruvate with yields of 0.884 g/g, 0.802 g/g, 0.817 g/g and 0.808 g/L, respectively. The pyruvate accumulation curve coupled with cell growth except for mannose as carbon source. When the inoculation size increased, the rate of glucose consumption, pyruvate accumulation and cell growth increased but lower pyruvate concentration. This study demonstrates that E. coli lpdA mutant has the potential to produce pyruvic acid from xylose and mannose.
