Bioprocess and Biosystems Engineering

, Volume 32, Issue 3, pp 313–320 | Cite as

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

  • Li Zhao
  • Yu Zheng
  • Xingyuan MaEmail author
  • Dongzhi WeiEmail author
Original Paper


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.


1,3-Propanediol 1,3-Propanediol oxidoreductase Glycerol dehydrogenase Klebsiella pneumoniae Micro-aerobic conditions 


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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.State Key Laboratory of Bioreactor Engineering, New World Institute of BiotechnologyEast China University of Science and TechnologyShanghaiPeople’s Republic of China

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