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Biotechnol Lett. 2008 Apr;30(4):657-63. Epub 2007 Nov 22.

An ethanol-tolerant recombinant Escherichia coli expressing Zymomonas mobilis pdc and adhB genes for enhanced ethanol production from xylose.

Author information

1
College of Biological Sciences, China Agricultural University, Beijing 100094, P.R. China.

Abstract

An ethanol-tolerant mutant, ET1, was isolated by an enrichment method from Escherichia coli JM109. Strains JM109 and ET1 were transformed with expression vector pZY507bc containing Zymomonas mobilis alcohol dehydrogenase II (adhB) and pyruvate decarboxylase (pdc) genes, resulting in an ethanol-sensitive recombinant strain JMbc and an ethanol-tolerant recombinant strain, ET1bc. Alcohol dehydrogenase and pyruvate decarboxylase activities were 24 and 32% lower, respectively, in JMbc than in ET1bc. ET1bc fermented 10% (w/v) xylose to give 39.4 g ethanol/l (77%, theoretical yield), a 1.3-fold increase compared with the ethanol-sensitive strain JMbc.

PMID:
18034308
DOI:
10.1007/s10529-007-9597-x
[Indexed for MEDLINE]

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