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Related Experiment Videos

Cd2+ accommodation by Saccharomyces cerevisiae.

M Joho, C Yamanaka, T Murayama

    Microbios
    |January 1, 1986
    PubMed
    Summary
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    Baker

    Area of Science:

    • Microbiology
    • Environmental Science
    • Biochemistry

    Background:

    • Cadmium (Cd2+) is a toxic heavy metal.
    • Understanding cellular mechanisms for heavy metal detoxification is crucial for environmental and health applications.
    • Saccharomyces cerevisiae (baker's yeast) is a model organism for studying cellular responses to stress.

    Purpose of the Study:

    • To investigate the mechanism by which Saccharomyces cerevisiae accommodates cadmium (Cd2+).
    • To identify cellular components involved in cadmium tolerance and detoxification.

    Main Methods:

    • Exposure of Saccharomyces cerevisiae to cadmium sulfate (CdSO4) in synthetic medium.
    • Monitoring cell proliferation, viable cell counts, and organic acid excretion.
    • Quantifying intracellular cadmium distribution using cell fractionation.

    Related Experiment Videos

  • Analyzing cadmium binding to soluble proteins via molecular weight.

    • Main Results:

    • A time lag of approximately 18 hours preceded cell proliferation in Cd2+-containing medium.
    • During the lag phase, cells did not excrete organic acids or produce CdS.
    • Cd-accommodated cells showed higher cytosolic Cd2+ distribution (approx. 30%) compared to unaccommodated cells.
    • Cd2+ in accommodated cells was found bound to low molecular weight cytosolic proteins (<30,000 Da).

    Conclusions:

    • Cadmium accommodation in Saccharomyces cerevisiae involves binding to low molecular weight cytosolic proteins.
    • This binding likely reduces cadmium toxicity, although the precise accommodation mechanism requires further elucidation.
    • The findings provide insights into yeast's heavy metal detoxification strategies.