Evolutionary engineering of Saccharomyces cerevisiae for efficient aerobic xylose consumption.

Gionata Scalcinati, José Manuel Otero, Jennifer R. H. Van Vleet, Thomas W. Jeffries, Lisbeth Olsson, Jens Nielsen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Industrial biotechnology aims to develop robust microbial cell factories, such as Saccharomyces cerevisiae, to produce an array of added value chemicals presently dominated by petrochemical processes. Xylose is the second most abundant monosaccharide after glucose and the most prevalent pentose sugar found in lignocelluloses. Significant research efforts have focused on the metabolic engineering of S. cerevisiae for fast and efficient xylose utilization. This study aims to metabolically engineer S. cerevisiae, such that it can consume xylose as the exclusive substrate while maximizing carbon flux to biomass production. Such a platform may then be enhanced with complementary metabolic engineering strategies that couple biomass production with high value-added chemical. Saccharomyces cerevisiae, expressing xylose reductase, xylitol dehydrogenase and xylulose kinase, from the native xylose-metabolizing yeast Pichia stipitis, was constructed, followed by a directed evolution strategy to improve xylose utilization rates. The resulting S. cerevisiae strain was capable of rapid growth and fast xylose consumption producing only biomass and negligible amount of byproducts. Transcriptional profiling of this strain was employed to further elucidate the observed physiology confirms a strongly up-regulated glyoxylate pathway enabling respiratory metabolism. The resulting strain is a desirable platform for the industrial production of biomass-related products using xylose as a sole carbon source.
    Original languageEnglish
    JournalF E M S Yeast Research
    Volume12
    Issue number5
    Pages (from-to)582-597
    ISSN1567-1356
    DOIs
    Publication statusPublished - 2012

    Keywords

    • Directed evolution
    • Metabolic engineering
    • Xylose
    • Saccharomyces cerevisiae
    • Transcriptomics

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