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Structure and function of H+-ATPase.

Y Kagawa, N Sone, H Hirata

    Journal of Bioenergetics and Biomembranes
    |August 1, 1979
    PubMed
    Summary
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    Proton-translocating ATPase (H+-ATPase) is a universal energy converter. Studies reveal its structure, subunit functions, and how H+-ATPase synthesizes ATP via proton flow.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Cellular Energetics

    Background:

    • Proton-translocating ATPase (H+-ATPase) is a crucial energy-converting enzyme found in cell membranes.
    • Understanding its structure and function is key to cellular energy transformation.

    Purpose of the Study:

    • To elucidate the structure and function of H+-ATPase.
    • To demonstrate the roles of its subunits in proton translocation and ATP synthesis.

    Main Methods:

    • Crystallization of the catalytic F1 portion.
    • Reconstitution of F1 from subunits using thermophilic F1.
    • Studies on purified thermostable F0, including H+-flux measurements.
    • Reconstitution of H+-ATPase-liposomes.

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    Main Results:

    • H+-ATPase is a hexagonal molecule (F1 portion) with a molecular weight of ~380,000.
    • The gamma delta epsilon-complex acts as a gate, beta subunits are catalytic, and all five subunits (alpha3 beta3 gamma delta epsilon) are involved in H+-translocation.
    • F0 functions as an H+-channel.
    • ATP synthesis is directly driven by H+ flow, and H+ translocation is driven by ATP hydrolysis.

    Conclusions:

    • H+-ATPase directly synthesizes ATP through proton flow driven by an electrochemical gradient.
    • This mechanism confirms the essential roles of H+-ATPase components and excludes other hypothetical factors in H+-driven ATP synthesis.