Abstract
To improve production of ethanol from glycerol, the methylotrophic yeast Hansenula polymorpha was engineered to express the pdc and adhB genes encoding pyruvate decarboxylase and aldehyde dehydrogenase II from Zymomonas mobilis, respectively, under the control of the glyceraldehyde-3-phosphate dehydrogenase (GAPDH) promoter. The ethanol yield was 3.3-fold higher (2.74 g l−1) in the engineered yeast compared with the parent strain (0.83 g l−1). Further engineering to stimulate glycerol utilization in the recombinant strain via expression of dhaD and dhaKLM genes from Klebsiella pneumoniae encoding glycerol dehydrogenase and dehydroxyacetone kinase, respectively, resulted in a 3.7-fold increase (3.1 g l−1) in ethanol yield.
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This research was supported by a grant from the KRIBB Research Initiative Program.
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Hong, WK., Kim, CH., Heo, SY. et al. Enhanced production of ethanol from glycerol by engineered Hansenula polymorpha expressing pyruvate decarboxylase and aldehyde dehydrogenase genes from Zymomonas mobilis . Biotechnol Lett 32, 1077–1082 (2010). https://doi.org/10.1007/s10529-010-0259-z
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DOI: https://doi.org/10.1007/s10529-010-0259-z