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Related Experiment Videos

Sequential utilization of mixed monosaccharides by yeasts.

H Y Hsiao, L C Chiang, P P Ueng

    Applied and Environmental Microbiology
    |April 1, 1982
    PubMed
    Summary

    Four yeasts were studied for their carbon source consumption. Glucose inhibited the use of other sugars like xylose, suggesting catabolite repression in yeast metabolism.

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    Patents and literature.

    Applied biochemistry and biotechnology·2013

    Area of Science:

    • Microbiology
    • Biochemistry
    • Yeast Metabolism

    Background:

    • Yeasts are crucial in biotechnology for utilizing various carbon sources.
    • Understanding substrate utilization pathways is key to optimizing fermentation processes.
    • Different yeast species exhibit unique metabolic capabilities.

    Purpose of the Study:

    • To investigate the substrate utilization patterns of four yeast species: Saccharomyces cerevisiae, Schizosaccharomyces pombe, Candida utilus, and Rhodotorula toruloides.
    • To determine the effects of glucose on the consumption of D-xylose, D-xylulose, and D-xylitol.
    • To explore the regulatory mechanisms governing carbon source metabolism in these yeasts.

    Main Methods:

    • Culturing four yeast species on media containing individual or mixed carbon sources (D-glucose, D-xylose, D-xylulose, D-xylitol).
    • Monitoring yeast growth and substrate consumption over time.
    • Analyzing substrate utilization sequences and identifying potential inhibitory effects.

    Main Results:

    • Sequential utilization of D-glucose followed by D-xylulose was observed when provided as a mixed carbon source.
    • D-glucose significantly inhibited the utilization of D-xylose and D-xylitol in Candida utilus and Rhodotorula toruloides.
    • Rhodotorula toruloides and Candida utilus consumed D-xylose, D-xylitol, and D-xylulose simultaneously under certain conditions.

    Conclusions:

    • Catabolite inhibition is a likely mechanism regulating substrate preference in yeast metabolism.
    • The findings highlight differential substrate utilization capabilities among yeast species.
    • This research provides insights into optimizing yeast-based bioprocesses by understanding carbon source interactions.

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