organic phosphonate catabolic process / coenzyme-B sulfoethylthiotransferase / coenzyme-B sulfoethylthiotransferase activity / methanogenesis / ATP hydrolysis activity / ATP binding / metal ion binding / cytoplasm 類似検索 - 分子機能
Methyl coenzyme M reductase system, component A2 / Methyl-coenzyme M reductase, protein C / Uncharacterised conserved protein UCP019164, methanogenesis / Uncharacterised protein family UPF0288, methanogenesis / Uncharacterised conserved protein UCP019464, methanogenesis / Uncharacterised conserved protein UCP037053 / Protein of unknown function DUF2098 / Methyl-coenzyme M reductase, protein C-like / Methyl-coenzyme M reductase operon protein C / Uncharacterized protein conserved in archaea (DUF2098) ...Methyl coenzyme M reductase system, component A2 / Methyl-coenzyme M reductase, protein C / Uncharacterised conserved protein UCP019164, methanogenesis / Uncharacterised protein family UPF0288, methanogenesis / Uncharacterised conserved protein UCP019464, methanogenesis / Uncharacterised conserved protein UCP037053 / Protein of unknown function DUF2098 / Methyl-coenzyme M reductase, protein C-like / Methyl-coenzyme M reductase operon protein C / Uncharacterized protein conserved in archaea (DUF2098) / Uncharacterized protein conserved in archaea (DUF2113) / Methyl-coenzyme M reductase, gamma subunit / Methyl-coenzyme M reductase, alpha subunit, N-terminal subdomain 1 / Methyl-coenzyme M reductase, gamma subunit superfamily / Methyl-coenzyme M reductase gamma subunit / Methyl-coenzyme M reductase, beta subunit / Methyl coenzyme M reductase, alpha subunit / Methyl-coenzyme M reductase, beta subunit, C-terminal / Methyl-coenzyme M reductase, beta subunit, N-terminal / Methyl-coenzyme M reductase beta subunit, C-terminal domain / Methyl-coenzyme M reductase beta subunit, N-terminal domain / Methyl-coenzyme M reductase, alpha subunit, N-terminal / Methyl-coenzyme M reductase, alpha/beta subunit, C-terminal / Methyl-coenzyme M reductase, ferredoxin-like fold / Methyl-coenzyme M reductase, alpha subunit, C-terminal / Methyl-coenzyme M reductase, alpha subunit, N-terminal subdomain 2 / Methyl-coenzyme M reductase alpha subunit, C-terminal domain / Methyl-coenzyme M reductase alpha subunit, N-terminal domain / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase 類似検索 - ドメイン・相同性
Glycine betaine/carnitine/choline transport ATP-binding protein OpuCA / DUF2098 domain-containing protein / Methyl-coenzyme M reductase subunit alpha / Methyl-coenzyme M reductase subunit beta / Methyl-coenzyme M reductase subunit gamma / UPF0288 protein MmarC6_0796 / Methyl-coenzyme M reductase operon protein C / Methanogenesis marker protein 17 / Methanogenesis marker protein 7 類似検索 - 構成要素
ジャーナル: Nature / 年: 2025 タイトル: Structure of the ATP-driven methyl-coenzyme M reductase activation complex. 著者: Fidel Ramírez-Amador / Sophia Paul / Anuj Kumar / Christian Lorent / Sebastian Keller / Stefan Bohn / Thinh Nguyen / Stefano Lometto / Dennis Vlegels / Jörg Kahnt / Darja Deobald / Frank ...著者: Fidel Ramírez-Amador / Sophia Paul / Anuj Kumar / Christian Lorent / Sebastian Keller / Stefan Bohn / Thinh Nguyen / Stefano Lometto / Dennis Vlegels / Jörg Kahnt / Darja Deobald / Frank Abendroth / Olalla Vázquez / Georg Hochberg / Silvan Scheller / Sven T Stripp / Jan Michael Schuller / 要旨: Methyl-coenzyme M reductase (MCR) is the enzyme responsible for nearly all biologically generated methane. Its active site comprises coenzyme F, a porphyrin-based cofactor with a central nickel ion ...Methyl-coenzyme M reductase (MCR) is the enzyme responsible for nearly all biologically generated methane. Its active site comprises coenzyme F, a porphyrin-based cofactor with a central nickel ion that is active exclusively in the Ni(I) state. How methanogenic archaea perform the reductive activation of F represents a major gap in our understanding of one of the most ancient bioenergetic systems in nature. Here we purified and characterized the MCR activation complex from Methanococcus maripaludis. McrC, a small subunit encoded in the mcr operon, co-purifies with the methanogenic marker proteins Mmp7, Mmp17, Mmp3 and the A2 component. We demonstrated that this complex can activate MCR in vitro in a strictly ATP-dependent manner, enabling the formation of methane. In addition, we determined the cryo-electron microscopy structure of the MCR activation complex exhibiting different functional states with local resolutions reaching 1.8-2.1 Å. Our data revealed three complex iron-sulfur clusters that formed an electron transfer pathway towards F. Topology and electron paramagnetic resonance spectroscopy analyses indicate that these clusters are similar to the [8Fe-9S-C] cluster, a maturation intermediate of the catalytic cofactor in nitrogenase. Altogether, our findings offer insights into the activation mechanism of MCR and prospects on the early evolution of nitrogenase.
凍結剤: ETHANE-PROPANE / チャンバー内湿度: 100 % / チャンバー内温度: 277 K / 装置: FEI VITROBOT MARK IV 詳細: Vitrification setup inside a Coy Lab's Vinyl anaerobic chamber to preserve the protein sample under strict anaerobic conditions (95% N2/ 5% H2).
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
撮影
フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) 実像数: 28171 / 平均電子線量: 60.0 e/Å2 詳細: Dataset obtained with 25 degree of pretilting to overcome preferred orientation issues