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Altered sterol composition renders yeast thermotolerant
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2014 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 346, no 6205, 75-78 p.Article in journal (Refereed) Published
Abstract [en]

Ethanol production for use as a biofuel is mainly achieved through simultaneous saccharification and fermentation by yeast. Operating at >= 40 degrees C would be beneficial in terms of increasing efficiency of the process and reducing costs, but yeast does not grow efficiently at those temperatures. We used adaptive laboratory evolution to select yeast strains with improved growth and ethanol production at >= 40 degrees C. Sequencing of the whole genome, genome-wide gene expression, and metabolic-flux analyses revealed a change in sterol composition, from ergosterol to fecosterol, caused by mutations in the C-5 sterol desaturase gene, and increased expression of genes involved in sterol biosynthesis. Additionally, large chromosome III rearrangements and mutations in genes associated with DNA damage and respiration were found, but contributed less to the thermotolerant phenotype.

Place, publisher, year, edition, pages
2014. Vol. 346, no 6205, 75-78 p.
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Biological Sciences
URN: urn:nbn:se:kth:diva-154740DOI: 10.1126/science.1258137ISI: 000342446900053ScopusID: 2-s2.0-84907483760OAI: diva2:761171
Science for Life Laboratory - a national resource center for high-throughput molecular bioscienceEU, European Research Council, 247013Swedish Research Council

QC 20141105

Available from: 2014-11-05 Created: 2014-10-27 Last updated: 2014-11-05Bibliographically approved

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Hallström, Björn M.
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Proteomics and NanobiotechnologyScience for Life Laboratory, SciLifeLab
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