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Title: Genetic changes that increase 5-hydroxymethyl furfural resistance in ethanol-producing Escherichia coli LY180

Journal Article · · Biotechnology Letters
 [1];  [2];  [2];  [2]
  1. Univ. of Florida, Gainesville, FL (United States). Dept. of Microbiology and Cell Science; OSTI
  2. Univ. of Florida, Gainesville, FL (United States). Dept. of Microbiology and Cell Science

The ability of a biocatalyst to tolerate furan inhibitors present in hemicellulose hydrolysates is important for the production of renewable chemicals. This study shows EMFR9, a furfural-tolerant mutant of ethanologenic E. coli LY180, has also acquired tolerance to 5-hydroxymethyl furfural (5-HMF). The mechanism of action of 5-HMF and furfural appear similar. Furan tolerance results primarily from lower expression of yqhD and dkgA, two furan reductases with a low Km for NADPH. Furan tolerance was also increased by adding plasmids encoding a NADPH/ NADH transhydrogenase (pntAB). Together, these results support the hypothesis that the NADPH-dependent reduction of furans by YqhD and DkgA inhibits growth by competing with biosynthesis for this limiting cofactor.

Research Organization:
Univ. of Florida, Gainesville, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG36-08GO88142
OSTI ID:
1816629
Journal Information:
Biotechnology Letters, Journal Name: Biotechnology Letters Journal Issue: 5 Vol. 32; ISSN 0141-5492
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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