期刊
BIORESOURCE TECHNOLOGY
卷 117, 期 -, 页码 317-324出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.03.013
关键词
Gluconobacter oxydans; Sorbitol dehydrogenase; Adaptive evolution; Dihydroxyacetone; Biotransformation
资金
- Natural Science Foundation of Shanghai [11ZR1408100]
- National Basic Research Program of China (973 Program) [2012CB721101]
- National Special Fund for State Key Laboratory of Bioreactor Engineering [2060204]
- Shanghai Leading Academic Discipline Project [B505]
Gluconobacter oxydans can rapidly and effectively transform glycerol to dihydroxyacetone (DNA) by membrane-bound quinoprotein sorbitol dehydrogenase (mSLDH). Two mutant strains of GDHE Delta adh pBBR-(tufB)sldAB and GDHE Delta adh pBBR-sldAB derived from the GDHE strain were constructed for the enhancement of DHA production. Growth performances of both strains were largely improved after adaptively growing in the medium with glucose as the sole carbon source. The resulting GAT and CAN strains exhibited better catalytic property than the GDHE strain in the presence of a high concentration of glycerol. All strains of GDHE, GAT and CAN cultivated on glucose showed enhanced catalytic capacity than those grown on sorbitol, indicating a favorable prospect of using glucose as carbon source to reduce the cost in industrial production. It was also the first time to reveal that the expression level of the sldAB gene in glucose-growing strains were higher than that of the strains cultivated on sorbitol. (C) 2012 Elsevier Ltd. All rights reserved.
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