- PDB-9nvm: ATPase Hybrid F1 with the ancestral core domains Catalytic Dwell -
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基本情報
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データベース: PDB / ID: 9nvm
タイトル
ATPase Hybrid F1 with the ancestral core domains Catalytic Dwell
要素
(ATPase hybrid F1 with the ancestral core domains ...) x 2
ATP synthase gamma chain
キーワード
ELECTRON TRANSPORT / Enerygy / Ancestral ATPase
機能・相同性
機能・相同性情報
proton motive force-driven plasma membrane ATP synthesis / proton-transporting ATP synthase complex / proton-transporting ATP synthase activity, rotational mechanism / ATP binding / plasma membrane 類似検索 - 分子機能
ATP synthase, F1 complex, gamma subunit conserved site / ATP synthase gamma subunit signature. / ATP synthase, F1 complex, gamma subunit / ATP synthase, F1 complex, gamma subunit superfamily / ATP synthase 類似検索 - ドメイン・相同性
National Health and Medical Research Council (NHMRC, Australia)
オーストラリア
引用
ジャーナル: Protein Sci / 年: 2025 タイトル: Functional and structural characterization of F-ATPase with common ancestral core domains in stator ring. 著者: Aya K Suzuki / Ryutaro Furukawa / Meghna Sobti / Simon H J Brown / Alastair G Stewart / Satoshi Akanuma / Hiroshi Ueno / Hiroyuki Noji / 要旨: Extant F-ATPases exhibit diverse rotational stepping behaviors-3-, 6-, or 9-step cycles-yet the evolutionary origin of these patterns remains unclear. Here, we used ancestral sequence reconstruction ...Extant F-ATPases exhibit diverse rotational stepping behaviors-3-, 6-, or 9-step cycles-yet the evolutionary origin of these patterns remains unclear. Here, we used ancestral sequence reconstruction to infer the catalytic β and non-catalytic α subunits of a putative ancestral F-ATPase. We then fused their functionally critical domains into the thermostable F from Bacillus PS3, yielding a stable chimeric enzyme. Cryo-EM revealed two distinct conformational states-binding and catalytic dwell states-separated by a ~34° rotation of the γ subunit, suggesting a fundamental six-step mechanism akin to that of extant six-stepping F-ATPases. Single-molecule rotation assays with ATP and the slowly hydrolyzed ATP analog ATPγS demonstrated that the chimeric motor is intrinsically a six-stepper, pausing at binding and catalytic dwell positions separated by 32.1°, although the binding dwell is significantly prolonged by an unknown mechanism. These findings indicate that F-ATPase was originally a six-stepper and diversified into 3-, 6- and 9-step forms in evolutionary adaptation. Based on these results, we discuss plausible features of the entire FF complex, along with potential physiological contexts in the last universal common ancestor and related lineages.
A: ATPase hybrid F1 with the ancestral core domains alpha chains B: ATPase hybrid F1 with the ancestral core domains alpha chains C: ATPase hybrid F1 with the ancestral core domains alpha chains D: ATPase hybrid F1 with the ancestral core domains beta chains E: ATPase hybrid F1 with the ancestral core domains beta chains F: ATPase hybrid F1 with the ancestral core domains beta chains G: ATP synthase gamma chain ヘテロ分子