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Related Experiment Videos

Yeast killer mutants with altered double-stranded ribonucleic acid.

M Vodkin, F Katterman, G R Fink

    Journal of Bacteriology
    |February 1, 1974
    PubMed
    Summary
    This summary is machine-generated.

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    Killer yeast strains possess specific double-stranded RNA (dsRNA) molecules. The M dsRNA component is crucial for toxin production and immunity functions in Saccharomyces cerevisiae.

    Area of Science:

    • Molecular biology
    • Yeast genetics
    • Virology

    Background:

    • Killer strains of Saccharomyces cerevisiae harbor two distinct double-stranded RNA (dsRNA) species, L (2.5 x 10^6) and M (1.4 x 10^6).
    • The M dsRNA component is characterized by high adenine content and is implicated in killer phenotypes.

    Purpose of the Study:

    • To investigate the role of dsRNA components in killer yeast, specifically the M dsRNA, in toxin production and immunity.
    • To characterize dsRNA profiles in various killer mutants, including those defective in toxin and/or immunity functions.

    Main Methods:

    • Analysis of dsRNA profiles in wild-type and mutant killer yeast strains using molecular weight estimations.
    • Comparison of dsRNA content and composition across different mutant classes (e.g., toxin-deficient, immunity-deficient, temperature-sensitive, superkiller).

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    Main Results:

    • Mutants lacking both toxin and immunity functions are devoid of M dsRNA, with one mutant exhibiting a novel 5 x 10^5 molecular weight dsRNA.
    • Superkiller strains possess 2.5 times more M dsRNA than standard killer strains.
    • Immunity-minus mutants contain an additional 2.5 x 10^5 molecular weight dsRNA alongside the standard L and M dsRNAs.

    Conclusions:

    • The M dsRNA is strongly correlated with and likely controls toxin production in killer yeast.
    • The L and M dsRNA species appear to be co-regulated, as M dsRNA absence leads to significant alterations in L dsRNA levels.