A constitutive catabolite repression mutant of a recombinant Saccharomyces cerevisiae strain improves xylose consumption during fermentation

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dc.contributor.authorThanvanthri Gururajan V.
dc.contributor.authorGorwa-Grauslund M.-F.
dc.contributor.authorHahn-Hagerdal B.
dc.contributor.authorPretorius I.S.
dc.contributor.authorCordero Otero R.R.
dc.date.accessioned2011-05-15T16:01:13Z
dc.date.available2011-05-15T16:01:13Z
dc.date.issued2007
dc.description.abstractEfficient xylose utilisation by microorganisms is of importance to the lignocellulose fermentation industry. The aim of this work was to develop constitutive catabolite repression mutants in a xylose-utilising recombinant Saccharomyces cerevisiae strain and evaluate the differences in xylose consumption under fermentation conditions. S. cerevisiae YUSM was constitutively catabolite repressed through specific disruptions within the MIG1 gene. The strains were grown aerobically in synthetic complete medium with xylose as the sole carbon source. Constitutive catabolite repressed strain YCR17 grew four-fold better on xylose in aerobic conditions than the control strain YUSM. Anaerobic batch fermentation in minimal medium with glucose-xylose mixtures and N-limited chemostats with varying sugar concentrations were performed. Sugar utilisation and metabolite production during fermentation were monitored. YCR17 exhibited a faster xylose consumption rate than YUSM under high glucose conditions in nitrogen-limited chemostat cultivations. This study shows that a constitutive catabolite repressed mutant could be used to enhance the xylose consumption rate even in the presence of high glucose in the fermentation medium. This could help in reducing fermentation time and cost in mixed sugar fermentation.
dc.description.versionArticle
dc.identifier.citationAnnals of Microbiology
dc.identifier.citation57
dc.identifier.citation1
dc.identifier.issn15904261
dc.identifier.urihttp://hdl.handle.net/10019.1/11872
dc.subjectSaccharomyces cerevisiae
dc.titleA constitutive catabolite repression mutant of a recombinant Saccharomyces cerevisiae strain improves xylose consumption during fermentation
dc.typeArticle
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