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Structural snapshots of V/A-ATPase reveal the rotary catalytic mechanism of rotary ATPases

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  • J. Kishikawa

    (Kyoto Sangyo University, Kamigamo-Motoyama
    Osaka University)

  • A. Nakanishi

    (Kyoto Sangyo University, Kamigamo-Motoyama
    Osaka University)

  • A. Nakano

    (Kyoto Sangyo University, Kamigamo-Motoyama)

  • S. Saeki

    (Kyoto Sangyo University, Kamigamo-Motoyama)

  • A. Furuta

    (Kyoto Sangyo University, Kamigamo-Motoyama)

  • T. Kato

    (Osaka University)

  • K. Mistuoka

    (Osaka University)

  • K. Yokoyama

    (Kyoto Sangyo University, Kamigamo-Motoyama)

Abstract

V/A-ATPase is a motor protein that shares a common rotary catalytic mechanism with FoF1 ATP synthase. When powered by ATP hydrolysis, the V1 domain rotates the central rotor against the A3B3 hexamer, composed of three catalytic AB dimers adopting different conformations (ABopen, ABsemi, and ABclosed). Here, we report the atomic models of 18 catalytic intermediates of the V1 domain of V/A-ATPase under different reaction conditions, determined by single particle cryo-EM. The models reveal that the rotor does not rotate immediately after binding of ATP to the V1. Instead, three events proceed simultaneously with the 120˚ rotation of the shaft: hydrolysis of ATP in ABsemi, zipper movement in ABopen by the binding ATP, and unzipper movement in ABclosed with release of both ADP and Pi. This indicates the unidirectional rotation of V/A-ATPase by a ratchet-like mechanism owing to ATP hydrolysis in ABsemi, rather than the power stroke model proposed previously for F1-ATPase.

Suggested Citation

  • J. Kishikawa & A. Nakanishi & A. Nakano & S. Saeki & A. Furuta & T. Kato & K. Mistuoka & K. Yokoyama, 2022. "Structural snapshots of V/A-ATPase reveal the rotary catalytic mechanism of rotary ATPases," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28832-5
    DOI: 10.1038/s41467-022-28832-5
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    References listed on IDEAS

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