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Investigating glucose and xylose metabolism in Saccharomyces cerevisiae and Scheffersomyces stipitis via 13C metabolic flux analysis

Authors

  • Xueyang Feng,

    1. Dept. of Chemical and Biomolecular Engineering, Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL
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  • Huimin Zhao

    Corresponding author
    • Dept. of Chemistry, Biochemistry, and Bioengineering, and Dept. of Chemical and Biomolecular Engineering, Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL
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Correspondence concerning this article should be addressed to zhao5@illinois.edu.

Abstract

13C metabolic flux analysis (13C[BOND]MFA) has been extensively applied in studying the glucose metabolism of yeast strains such as Saccharomyces cerevisiae and Scheffersomyces stipitis. Here, we tried to augment the previous fluxomic studies by applying 13C[BOND]MFA to rigorously investigate the metabolic flux distributions in S. stipitis and the recombinant S. cerevisiae strains when xylose was utilized as the sole carbon substrate. It was found that less carbon fluxes were diverted into the TCA cycle in S. stipitis than the recombinant S. cerevisiae strains. Compared to single sugar utilization, the co-utilization of glucose and xylose by S. stipitis led to increased metabolic fluxes into the futile pathway and the TCA cycle, but did not improve sugar-based ethanol yield. In addition, heterologous expression of xylose pathway in engineered S. cerevisiae strains may affect the glucose utilization. © 2013 American Institute of Chemical Engineers AIChE J, 59: 3195–3202, 2013

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