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Related Experiment Videos

Oligomycin-resistant mitochondrial ATPase from mouse fibroblasts.

M C Kuhns, J M Eisenstadt

    Somatic Cell Genetics
    |November 1, 1979
    PubMed
    Summary

    Researchers isolated oligomycin-resistant mutants, finding altered mitochondrial ATPase activity is responsible for resistance. These mutants show varying stability and resistance levels to oligomycin and other inhibitors.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Genetics

    Background:

    • Oligomycin is a potent inhibitor of mitochondrial ATP synthase.
    • Understanding drug resistance mechanisms is crucial for developing new therapeutics.

    Purpose of the Study:

    • To isolate and characterize oligomycin-resistant mutants.
    • To investigate the role of mitochondrial ATPase in oligomycin resistance.

    Main Methods:

    • Mutagenesis of LM(TK-) cells using minicells.
    • Isolation and growth of oligomycin-resistant clones.
    • Measurement of mitochondrial ATPase activity and resistance to inhibitors (oligomycin, DCCD, venturicidin).

    Main Results:

    • Fourteen oligomycin-resistant clones were isolated.
    • Mutants exhibited varying degrees of oligomycin resistance (1.2-2.5 days doubling time).
    • Mitochondrial ATPase from resistant mutants showed significantly increased resistance to oligomycin, DCCD, and venturicidin.

    Conclusions:

    • Oligomycin resistance in these mutants is primarily due to alterations in mitochondrial ATPase.
    • The altered ATPase exhibits stable or unstable resistance phenotypes.
    • The findings provide insights into mitochondrial energy metabolism and drug resistance.

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