文献类型：期刊文献

英文题名：Effects of over-expression of glycerol dehydrogenase and 1,3-propanediol oxidoreductase on bioconversion of glycerol into 1,3-propandediol by Klebsiella pneumoniae under micro-aerobic conditions

作者：Zhao, Li[1];Zheng, Yu[1];Ma, Xingyuan[1];Wei, Dongzhi[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, New World Inst Biotechnol, Shanghai 200237, Peoples R China

年份：2009

卷号：32

期号：3

起止页码：313

外文期刊名：BIOPROCESS AND BIOSYSTEMS ENGINEERING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000264464000003)】；

语种：英文

外文关键词：1,3-Propanediol; 1,3-Propanediol oxidoreductase; Glycerol dehydrogenase; Klebsiella pneumoniae; Micro-aerobic conditions

摘要：Glycerol dehydrogenase (GDH) and 1,3-propanediol (1,3-PD) oxidoreductase had been proved two key enzymes for 1,3-PD production by Klebsiella pneumoniae. Fed-batch fermentations of the recombinant K. pneumoniae strains, over-expressing the two enzymes individually, were carried out under micro-aerobic conditions, and the behaviors of the recombinants were investigated. Results showed that over-expression of 1,3-PD oxidoreductase did not affect the concentration of 1,3-PD. However, it enhanced the molar yield from 50.6 to 64.0% and reduced the concentration of by-products. Among them, the concentrations of lactic acid, ethanol and succinic acid were decreased by 51.8, 50.6 and 47.4%, respectively. Moreover, in the recombinant the maximal concentration of 3-hydroxypropionaldehyde decreased by 73.6%. Over-expression of GDH decreased the yield of ethanol and 2,3-butanediol, meanwhile it increased the concentration of acetic acid. No significant changes were observed both in 1,3-PD yield and glycerol flux distributed to oxidative branch.