Knockout of the ptsG gene in engineered Escherichia coli for homoethanol fermentation from sugar mixture / 生物工程学报
Chinese Journal of Biotechnology
;
(12): 937-945, 2013.
Article
in Chinese
| WPRIM
| ID: wpr-233186
ABSTRACT
To realize the simultaneous fermentation of xylose and glucose, ptsG (one of the glucose-PTS genes) was deleted from the engineered ethanologenic Escherichia coli SZ470 (deltapflB, deltafrdABCD, deltaackA, deltaldhA), resulting in loss of glucose effect in the mutant SZ470P (deltaptsG). When tested in 5% mixture of glucose (2.5%) and xylose (2.5%), SZ470P simultaneously used glucose (13 g/L) and xylose (20 g/L) whereas the parent strain SZ470 sequentially used glucose (25 g/L) then xylose (5 g/L). Upon completion of the fermentation, both strains achieved similar product yield of 89%. SZ470P produced 15.01 g/L of ethanol, which was 14.32% higher than that produced by SZ470 (12.86 g/L). Deleting ptsG gene enabled the mutant strain SZ470P to simultaneously use both glucose and xylose and achieve better ethanol production.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Xylose
/
Phosphoenolpyruvate Sugar Phosphotransferase System
/
Chemistry
/
Ethanol
/
Escherichia coli
/
Fermentation
/
Genetics
/
Glucose
Language:
Chinese
Journal:
Chinese Journal of Biotechnology
Year:
2013
Type:
Article
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