Japan Agency for Medical Research and Development (AMED)
JP17am0101001
日本
Japan Society for the Promotion of Science (JSPS)
20J00162
日本
引用
ジャーナル: Nat Commun / 年: 2023 タイトル: Mechanism of ATP hydrolysis dependent rotation of bacterial ATP synthase. 著者: Atsuki Nakano / Jun-Ichi Kishikawa / Kaoru Mitsuoka / Ken Yokoyama / 要旨: F domain of ATP synthase is a rotary ATPase complex in which rotation of central γ-subunit proceeds in 120° steps against a surrounding αβ fueled by ATP hydrolysis. How the ATP hydrolysis ...F domain of ATP synthase is a rotary ATPase complex in which rotation of central γ-subunit proceeds in 120° steps against a surrounding αβ fueled by ATP hydrolysis. How the ATP hydrolysis reactions occurring in three catalytic αβ dimers are coupled to mechanical rotation is a key outstanding question. Here we describe catalytic intermediates of the F domain in FF synthase from Bacillus PS3 sp. during ATP mediated rotation captured using cryo-EM. The structures reveal that three catalytic events and the first 80° rotation occur simultaneously in F domain when nucleotides are bound at all the three catalytic αβ dimers. The remaining 40° rotation of the complete 120° step is driven by completion of ATP hydrolysis at αβ, and proceeds through three sub-steps (83°, 91°, 101°, and 120°) with three associated conformational intermediates. All sub-steps except for one between 91° and 101° associated with phosphate release, occur independently of the chemical cycle, suggesting that the 40° rotation is largely driven by release of intramolecular strain accumulated by the 80° rotation. Together with our previous results, these findings provide the molecular basis of ATP driven rotation of ATP synthases.