Use of catabolite repression mutants for fermentation of sugar mixtures to ethanol View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2001-07

AUTHORS

N. Nichols, B. Dien, R. Bothast

ABSTRACT

Use of agricultural biomass, other than corn-starch, to produce fuel ethanol requires a microorganism that can ferment the mixture of sugars derived from hemicellulose. Escherichia coli metabolizes a wide range of substrates and has been engineered to produce ethanol in high yield from sugar mixtures. E. coli metabolizes glucose in preference to other sugars and, as a result, utilization of the pentoses in hemicellulose-derived sugar mixtures is delayed and may be incomplete. Residual sugar lowers the ethanol yield and is problematic for downstream processing of fermentation products. Therefore, a catabolite repression mutant that simultaneously utilizes glucose and pentoses would be useful for fermentation of complex substrate mixtures. We constructed ethanologenic E. coli strains with a glucose phosphotransferase (ptsG) mutation and used the mutants to ferment glucose, arabinose, and xylose, singly and in mixtures, to ethanol. Yields were 87-94% of theoretical for both the wild type and mutants, but the mutants had an altered pattern of mixed sugar utilization. Phosphotransferase mutants metabolized the pentoses simultaneously with glucose, rather than sequentially. Based upon fermentations of sugar mixtures, a catabolite-repression mutant of ethanologenic E. coli is expected to provide more efficient fermentation of hemicellulose hydrolysates by allowing direct utilization of pentoses. More... »

PAGES

120-125

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s002530100628

DOI

http://dx.doi.org/10.1007/s002530100628

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1031253667

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/11499918


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