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Coupling between mitochondrial mutation and energy transduction.

H R Mahler, R N Bastos

    Proceedings of the National Academy of Sciences of the United States of America
    |June 1, 1974
    PubMed
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    Isolated yeast mitochondria perform novel reactions with ethidium bromide (Etd Br), including DNA scission and degradation. These processes are linked to energy transduction and ATPase activation.

    Area of Science:

    • Mitochondrial biology
    • Molecular genetics
    • Biochemistry

    Background:

    • Mitochondria possess unique DNA (mtDNA) with complex metabolic functions.
    • Ethidium bromide (Etd Br) is a known intercalating agent that can affect DNA structure and replication.

    Purpose of the Study:

    • To investigate novel reactions of isolated Saccharomyces cerevisiae mitochondria upon incubation with ethidium bromide (Etd Br).
    • To elucidate the relationship between Etd Br-induced mtDNA modifications, energy metabolism, and enzyme activity.

    Main Methods:

    • Incubation of isolated yeast mitochondria with ethidium bromide (Etd Br).
    • Analysis of DNA scission, Etd Br incorporation, and degradation of mtDNA.
    • Investigation of energy dependence (ATP) and enzyme activation using specific inhibitors.

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    Main Results:

    • Mitochondria performed five novel reactions: mtDNA scission, Etd Br incorporation, energy-dependent degradation of modified mtDNA, generation of a specific DNase, and activation of ATPase.
    • The degradation process required energy (ATP) and involved mtDNA'-Etd Br as an intermediate.
    • Inhibitor studies indicated the involvement of the mitochondrial adenosinetriphosphatase complex.

    Conclusions:

    • Isolated yeast mitochondria exhibit a complex, multi-step response to ethidium bromide, involving DNA modification and degradation.
    • These reactions are tightly coupled to the mitochondria's energy-transducing functions and involve the mitochondrial ATPase.
    • The findings reveal a novel interplay between intercalating agents, mitochondrial DNA, and cellular energy metabolism.