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-Structure paper
| タイトル | Structural basis for the conformational protection of nitrogenase from O. |
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| ジャーナル・号・ページ | Nature, Vol. 637, Issue 8047, Page 991-997, Year 2025 |
| 掲載日 | 2025年1月8日 |
著者 | Sarah M Narehood / Brian D Cook / Suppachai Srisantitham / Vanessa H Eng / Angela A Shiau / Kelly L McGuire / R David Britt / Mark A Herzik / F Akif Tezcan / ![]() |
| PubMed 要旨 | The low reduction potentials required for the reduction of dinitrogen (N) render metal-based nitrogen-fixation catalysts vulnerable to irreversible damage by dioxygen (O). Such O sensitivity ...The low reduction potentials required for the reduction of dinitrogen (N) render metal-based nitrogen-fixation catalysts vulnerable to irreversible damage by dioxygen (O). Such O sensitivity represents a major conundrum for the enzyme nitrogenase, as a large fraction of nitrogen-fixing organisms are either obligate aerobes or closely associated with O-respiring organisms to support the high energy demand of catalytic N reduction. To counter O damage to nitrogenase, diazotrophs use O scavengers, exploit compartmentalization or maintain high respiration rates to minimize intracellular O concentrations. A last line of damage control is provided by the 'conformational protection' mechanism, in which a [2Fe:2S] ferredoxin-family protein termed FeSII (ref. ) is activated under O stress to form an O-resistant complex with the nitrogenase component proteins. Despite previous insights, the molecular basis for the conformational O protection of nitrogenase and the mechanism of FeSII activation are not understood. Here we report the structural characterization of the Azotobacter vinelandii FeSII-nitrogenase complex by cryo-electron microscopy. Our studies reveal a core complex consisting of two molybdenum-iron proteins (MoFePs), two iron proteins (FePs) and one FeSII homodimer, which polymerize into extended filaments. In this three-protein complex, FeSII mediates an extensive network of interactions with MoFeP and FeP to position their iron-sulphur clusters in catalytically inactive but O-protected states. The architecture of the FeSII-nitrogenase complex is confirmed by solution studies, which further indicate that the activation of FeSII involves an oxidation-induced conformational change. |
リンク | Nature / PubMed:39779844 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.27 - 3.94 Å |
| 構造データ | EMDB-45923, PDB-9ctz: EMDB-45924, PDB-9cu0: EMDB-45925, PDB-9cu1: EMDB-45926, PDB-9cu2: |
| 化合物 | ![]() ChemComp-HCA: ![]() ChemComp-ICS: ![]() ChemComp-FE: ![]() ChemComp-CLF: ![]() ChemComp-HOH: ![]() ChemComp-ADP: ![]() ChemComp-MG: ![]() ChemComp-SF4: ![]() ChemComp-FES: |
| 由来 |
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キーワード | METAL BINDING PROTEIN / Nitrogenase / FeMoCo / nitrogen / P-cluster |
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azotobacter vinelandii (窒素固定)
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