Pause and rotation of F1-ATPase during catalysis

Yoko Hirono-Hara, Hiroyuki Noji, Masaya Nishiura, Eiro Muneyuki, Kiyotaka Y. Hara, Ryohei Yasuda, Kazuhiko Kinosita, Masasuke Yoshida*

*この研究の対応する著者

研究成果査読

155 被引用数 (Scopus)

抄録

F1-ATPase is a rotary motor enzyme in which a single ATP molecule drives a 120° rotation of the central γ subunit relative to the surrounding α3β3 ring. Here, we show that the rotation of F1-ATPase spontaneously lapses into long (≅30 s) pauses during steady-state catalysis. The effects of ADP-Mg and mutation on the pauses, as well as kinetic comparison with bulk-phase catalysis, strongly indicate that the paused enzyme corresponds to the inactive state of F1-ATPase previously known as the ADP-Mg inhibited form in which F1-ATPase fails to release ADP-Mg from catalytic sites. The pausing position of the γ subunit deviates from the ATP-waiting position and is most likely the recently found intermediate 90° position.

本文言語English
ページ(範囲)13649-13654
ページ数6
ジャーナルProceedings of the National Academy of Sciences of the United States of America
98
24
DOI
出版ステータスPublished - 2001 11 20
外部発表はい

ASJC Scopus subject areas

  • 遺伝学
  • 一般

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