formylmethanofuran dehydrogenase / formylmethanofuran dehydrogenase / formylmethanofuran dehydrogenase activity / Oxidoreductases; Acting on the aldehyde or oxo group of donors; With unknown physiological acceptors / CoB--CoM heterodisulfide reductase activity / formate metabolic process / oxidoreductase activity, acting on CH or CH2 groups, with an iron-sulfur protein as acceptor / methanogenesis, from carbon dioxide / 酸化還元酵素; 含硫化合物に対し酸化酵素として働く / formate dehydrogenase (NAD+) activity ...formylmethanofuran dehydrogenase / formylmethanofuran dehydrogenase / formylmethanofuran dehydrogenase activity / Oxidoreductases; Acting on the aldehyde or oxo group of donors; With unknown physiological acceptors / CoB--CoM heterodisulfide reductase activity / formate metabolic process / oxidoreductase activity, acting on CH or CH2 groups, with an iron-sulfur protein as acceptor / methanogenesis, from carbon dioxide / 酸化還元酵素; 含硫化合物に対し酸化酵素として働く / formate dehydrogenase (NAD+) activity / methanogenesis / hydrolase activity, acting on carbon-nitrogen (but not peptide) bonds / molybdopterin cofactor binding / iron-sulfur cluster binding / NADH dehydrogenase activity / transition metal ion binding / respiratory electron transport chain / 4 iron, 4 sulfur cluster binding / oxidoreductase activity / metal ion binding / membrane / plasma membrane 類似検索 - 分子機能
ジャーナル: Science / 年: 2021 タイトル: Three-megadalton complex of methanogenic electron-bifurcating and CO-fixing enzymes. 著者: Tomohiro Watanabe / Olivia Pfeil-Gardiner / Jörg Kahnt / Jürgen Koch / Seigo Shima / Bonnie J Murphy / 要旨: The first reaction of the methanogenic pathway from carbon dioxide (CO) is the reduction and condensation of CO to formyl-methanofuran, catalyzed by formyl-methanofuran dehydrogenase (Fmd). Strongly ...The first reaction of the methanogenic pathway from carbon dioxide (CO) is the reduction and condensation of CO to formyl-methanofuran, catalyzed by formyl-methanofuran dehydrogenase (Fmd). Strongly reducing electrons for this reaction are generated by heterodisulfide reductase (Hdr) in complex with hydrogenase or formate dehydrogenase (Fdh) using a flavin-based electron-bifurcation mechanism. Here, we report enzymological and structural characterizations of Fdh-Hdr-Fmd complexes from . The complexes catalyze this reaction using electrons from formate and the reduced form of the electron carrier F. Conformational changes in HdrA mediate electron bifurcation, and polyferredoxin FmdF directly transfers electrons to the CO reduction site, as evidenced by methanofuran-dependent flavin-based electron bifurcation even without free ferredoxin, a diffusible electron carrier between Hdr and Fmd. Conservation of Hdr and Fmd structures suggests that this complex is common among hydrogenotrophic methanogens.
モデルのタイプ: OTHER 詳細: ab initio model generation, stochastic gradient descent, Relion 3
最終 再構成
解像度のタイプ: BY AUTHOR / 解像度: 3.5 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: RELION (ver. 3.1) 詳細: This is a composite map. The maps that constitute this composite map have resolutions between 3.4 and 4.0 A. These have all been determined by FSC 0.143 cut-off. 使用した粒子像数: 203264
初期 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: RELION (ver. 3.1)
最終 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: RELION (ver. 3.1)