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-Structure paper
| タイトル | Molecular principles of redox-coupled sodium pumping of the ancient Rnf machinery. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 2302, Year 2025 |
| 掲載日 | 2025年3月7日 |
著者 | Anuj Kumar / Jennifer Roth / Hyunho Kim / Patricia Saura / Stefan Bohn / Tristan Reif-Trauttmansdorff / Anja Schubert / Ville R I Kaila / Jan M Schuller / Volker Müller / ![]() |
| PubMed 要旨 | The Rnf complex is the primary respiratory enzyme of several anaerobic prokaryotes that transfers electrons from ferredoxin to NAD and pumps ions (Na or H) across a membrane, powering ATP synthesis. ...The Rnf complex is the primary respiratory enzyme of several anaerobic prokaryotes that transfers electrons from ferredoxin to NAD and pumps ions (Na or H) across a membrane, powering ATP synthesis. Rnf is widespread in primordial organisms and the evolutionary predecessor of the Na-pumping NADH-quinone oxidoreductase (Nqr). By running in reverse, Rnf uses the electrochemical ion gradient to drive ferredoxin reduction with NADH, providing low potential electrons for nitrogenases and CO reductases. Yet, the molecular principles that couple the long-range electron transfer to Na translocation remain elusive. Here, we resolve key functional states along the electron transfer pathway in the Na-pumping Rnf complex from Acetobacterium woodii using redox-controlled cryo-electron microscopy that, in combination with biochemical functional assays and atomistic molecular simulations, provide key insight into the redox-driven Na pumping mechanism. We show that the reduction of the unique membrane-embedded [2Fe2S] cluster electrostatically attracts Na, and in turn, triggers an inward/outward transition with alternating membrane access driving the Na pump and the reduction of NAD. Our study unveils an ancient mechanism for redox-driven ion pumping, and provides key understanding of the fundamental principles governing energy conversion in biological systems. |
リンク | Nat Commun / PubMed:40055346 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.8 - 3.3 Å |
| 構造データ | EMDB-19915, PDB-9eri: EMDB-19916, PDB-9erj: EMDB-19919, PDB-9erk: EMDB-19920, PDB-9erl: |
| 化合物 | ![]() ChemComp-FES: ![]() ChemComp-SF4: ![]() ChemComp-FMN: ![]() ChemComp-NAD: ![]() ChemComp-RBF: ![]() ChemComp-NA: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / Bioenergetics / anaerobic cryoEM / electron transport / redox-driven sodium pumping / Anaerobic metabolism / electron transfer / sodium pumping |
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acetobacterium woodii dsm 1030 (バクテリア)
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