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-Structure paper
タイトル | Rotary mechanism of the prokaryotic V motor driven by proton motive force. |
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ジャーナル・号・ページ | Nat Commun, Vol. 15, Issue 1, Page 9883, Year 2024 |
掲載日 | 2024年11月20日 |
![]() | Jun-Ichi Kishikawa / Yui Nishida / Atsuki Nakano / Takayuki Kato / Kaoru Mitsuoka / Kei-Ichi Okazaki / Ken Yokoyama / ![]() |
PubMed 要旨 | ATP synthases play a crucial role in energy production by utilizing the proton motive force (pmf) across the membrane to rotate their membrane-embedded rotor c-ring, and thus driving ATP synthesis in ...ATP synthases play a crucial role in energy production by utilizing the proton motive force (pmf) across the membrane to rotate their membrane-embedded rotor c-ring, and thus driving ATP synthesis in the hydrophilic catalytic hexamer. However, the mechanism of how pmf converts into c-ring rotation remains unclear. This study presents a 2.8 Å cryo-EM structure of the V domain of V/A-ATPase from Thermus thermophilus, revealing precise orientations of glutamate (Glu) residues in the c-ring. Three Glu residues face a water channel, with one forming a salt bridge with the Arginine in the stator (a/Arg). Molecular dynamics (MD) simulations show that protonation of specific Glu residues triggers unidirectional Brownian motion of the c-ring towards ATP synthesis. When the key Glu remains unprotonated, the salt bridge persists, blocking rotation. These findings suggest that asymmetry in the protonation of c/Glu residues biases c-ring movement, facilitating rotation and ATP synthesis. |
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手法 | EM (単粒子) |
解像度 | 2.8 - 3.6 Å |
構造データ | EMDB-39644, PDB-8ywt: EMDB-39661, PDB-8yxz: EMDB-39662, PDB-8yy0: EMDB-39663, PDB-8yy1: |
化合物 | ![]() ChemComp-HOH: |
由来 |
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![]() | MOTOR PROTEIN / ROTARY ATPASE / V/A-ATPASE / MOLECULAR MOTOR / ATP synthase |