- EMDB-15452: Cryo-EM structure of the nitrogen-fixation associated NADH:ferred... -
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データベース: EMDB / ID: EMD-15452
タイトル
Cryo-EM structure of the nitrogen-fixation associated NADH:ferredoxin oxidoreductase RNF from Azotobacter vinelandii
マップデータ
unsharpened map
試料
複合体: Heptameric complex of NADH:ferredoxin oxidoreductase RNF
タンパク質・ペプチド: x 5種
タンパク質・ペプチド: x 2種
リガンド: x 5種
キーワード
metalloprotein / flavoprotein / electron transfer and Na+/H+ translocation / MEMBRANE PROTEIN
機能・相同性
機能・相同性情報
トランスロカーゼ / electron transport chain / transmembrane transport / FMN binding / 4 iron, 4 sulfur cluster binding / electron transfer activity / metal ion binding / plasma membrane 類似検索 - 分子機能
ジャーナル: Nat Chem Biol / 年: 2024 タイトル: Architecture of the RNF1 complex that drives biological nitrogen fixation. 著者: Lin Zhang / Oliver Einsle / 要旨: Biological nitrogen fixation requires substantial metabolic energy in form of ATP as well as low-potential electrons that must derive from central metabolism. During aerobic growth, the free-living ...Biological nitrogen fixation requires substantial metabolic energy in form of ATP as well as low-potential electrons that must derive from central metabolism. During aerobic growth, the free-living soil diazotroph Azotobacter vinelandii transfers electrons from the key metabolite NADH to the low-potential ferredoxin FdxA that serves as a direct electron donor to the dinitrogenase reductases. This process is mediated by the RNF complex that exploits the proton motive force over the cytoplasmic membrane to lower the midpoint potential of the transferred electron. Here we report the cryogenic electron microscopy structure of the nitrogenase-associated RNF complex of A. vinelandii, a seven-subunit membrane protein assembly that contains four flavin cofactors and six iron-sulfur centers. Its function requires the strict coupling of electron and proton transfer but also involves major conformational changes within the assembly that can be traced with a combination of electron microscopy and modeling.