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-Structure paper
タイトル | Structure and electron transfer pathways of an electron-bifurcating NiFe-hydrogenase. |
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ジャーナル・号・ページ | Sci Adv, Vol. 8, Issue 8, Page eabm7546, Year 2022 |
掲載日 | 2022年2月25日 |
著者 | Xiang Feng / Gerrit J Schut / Dominik K Haja / Michael W W Adams / Huilin Li / |
PubMed 要旨 | Electron bifurcation enables thermodynamically unfavorable biochemical reactions. Four groups of bifurcating flavoenzyme are known and three use FAD to bifurcate. FeFe-HydABC hydrogenase represents ...Electron bifurcation enables thermodynamically unfavorable biochemical reactions. Four groups of bifurcating flavoenzyme are known and three use FAD to bifurcate. FeFe-HydABC hydrogenase represents the fourth group, but its bifurcation site is unknown. We report cryo-EM structures of the related NiFe-HydABCSL hydrogenase that reversibly oxidizes H and couples endergonic reduction of ferredoxin with exergonic reduction of NAD. FMN surrounded by a unique arrangement of iron sulfur clusters forms the bifurcating center. NAD binds to FMN in HydB, and electrons from H via HydA to a HydB [4Fe-4S] cluster enable the FMN to reduce NAD. Low-potential electron transfer from FMN to the HydC [2Fe-2S] cluster and subsequent reduction of a uniquely penta-coordinated HydB [2Fe-2S] cluster require conformational changes, leading to ferredoxin binding and reduction by a [4Fe-4S] cluster in HydB. This work clarifies the electron transfer pathways for a large group of hydrogenases underlying many essential functions in anaerobic microorganisms. |
リンク | Sci Adv / PubMed:35213221 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.0 - 3.2 Å |
構造データ | EMDB-25633, PDB-7t2r: EMDB-25647, PDB-7t30: |
化合物 | ChemComp-FES: ChemComp-SF4: ChemComp-3NI: ChemComp-FCO: ChemComp-NAD: ChemComp-FMN: |
由来 |
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キーワード | OXIDOREDUCTASE / hydrogenase complex / electron bifurcation |