Chemo-mechanical coupling in F1-ATPaSe revealed by catalytic site occupancy during catalysis

Rieko Shimo-Kon, Eiro Muneyuki, Hiroshi Sakai, Kengo Adachi, Masasuke Yoshida, Kazuhiko Kinosita*

*この研究の対応する著者

    研究成果: Article査読

    44 被引用数 (Scopus)

    抄録

    F1-ATPase is a rotary molecular motor in which the central γ subunit rotates inside a cylinder made of α3β 3 subunits. To clarify how ATP hydrolysis in three catalytic sites cooperate to drive rotation, we measured the site occupancy, the number of catalytic sites occupied by a nucleotide, while assessing the hydrolysis activity under identical conditions. The results show hitherto unsettled timings of ADP and phosphate releases: starting with ATP binding to a catalytic site at an ATP-waiting γ angle defined as 0°, phosphate is released at -200°, and ADP is released during quick rotation between 240° and 320° that is initiated by binding of a third ATP. The site occupancy remains two except for a brief moment after the ATP binding, but the third vacant site can bind a medium nucleotide weakly.

    本文言語English
    ページ(範囲)1227-1236
    ページ数10
    ジャーナルBiophysical Journal
    98
    7
    DOI
    出版ステータスPublished - 2010 4月 7

    ASJC Scopus subject areas

    • 生物理学

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