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Volume 135, Issue 11

-Xylose Utilization by Free

Abstract

Summary: Although it is generally accepted that is unable to assimilate -xylose, four strains were found to utilize xylose aerobically at different efficiencies in the presence of a mixture of substrates. The degree of -xylose utilization by ATCC 26602 depended upon the presence of other substrates or yeast extract. The greatest amount of xylose (up to 69% over 7 d) was utilized when sugar substrates such as -ribose were co-metabolized. Much lower degrees of utilization occurred with co-metabolism of organic acids, polyols or ethanol. A mixture of -glucose, -ribose, -raffinose, glycerol and -xylose resulted in greater xylose utilization than the presence of a single substrate and xylose. The absence of growth on a co-substrate alone did not prevent the utilization of xylose in its presence. Xylose was co-metabolized with ribose under anaerobic conditions but at a much slower rate than under aerobic conditions. When [C]xylose was utilized in the presence of ribose under anaerobic conditions, the radioactive label was detected mainly in xylitol and not in the small amounts of ethanol produced. Under aerobic conditions the radioactive label was distributed between xylitol (91·3 α 0·8%), CO (2·6 α 2·3%) and biomass (1·7 α 0·6%). No other metabolic products were detected. Whereas most xylose was dissimilated rather than assimilated by , the organism apparently possesses a pathway which completely oxidizes xylose in the presence of another substrate.

  • Received:
  • Accepted:
  • Published Online:
© Society for General Microbiology 1989
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1989-11-01
2024-04-20
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D-Xylose Utilization by Saccharomyces cerevisiae
Microbiology 135, 2791 (1989); https://doi.org/10.1099/00221287-135-11-2791
/content/journal/micro/10.1099/00221287-135-11-2791
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