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Energy conservation and uncoupling in mitochondria.

Y Hatefi

    Journal of Supramolecular Structure
    |January 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Mitochondria have a specific binding site for uncouplers, identified as part of complex V. This finding clarifies how uncouplers affect energy conservation and ATP production in mitochondria.

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    Area of Science:

    • Biochemistry
    • Mitochondrial Physiology

    Background:

    • Mitochondrial energy conservation relies on controlled proton gradients.
    • Uncouplers disrupt this gradient, affecting ATP synthesis.

    Purpose of the Study:

    • To investigate the molecular basis of mitochondrial uncoupling.
    • To identify specific binding sites for uncouplers within mitochondria.

    Main Methods:

    • Photoaffinity labeling with 2-azido-4-nitrophenol.
    • Fractionation of mitochondrial complexes.
    • Assessment of ATP-Pi exchange activity.
    • Comparison of uncoupler potency and protonophoric activity.

    Main Results:

    • A specific uncoupler binding site (approx. 30 kDa polypeptide) was identified in mitochondria.

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  • This site is located within complex V, which mediates ATP-Pi exchange.
  • Complexes I, III, and IV lack this specific binding site.
  • Trinitrophenol's membrane impermeability and poor protonophore activity were confirmed.
  • Strong correlation between uncoupler binding affinity and potency was observed.

    • Conclusions:

    • Mitochondrial uncoupling involves a specific binding site, primarily within complex V.
    • Uncoupling potency is directly related to the affinity for this binding site, not solely protonophoric activity.