coenzyme-B sulfoethylthiotransferase / coenzyme-B sulfoethylthiotransferase activity / methanogenesis / metal ion binding / cytoplasm 類似検索 - 分子機能
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, 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, alpha subunit, N-terminal subdomain 1 / 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, gamma subunit superfamily / Methyl-coenzyme M reductase gamma subunit / 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 類似検索 - ドメイン・相同性
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.
分子 #6: Methyl-coenzyme M reductase operon protein C
分子
名称: Methyl-coenzyme M reductase operon protein C / タイプ: protein_or_peptide / ID: 6 詳細: N-terminally Twin-Strep-tagged Methyl-coenzyme M reductase operon protein C コピー数: 1 / 光学異性体: LEVO
モデル: Quantifoil R1.2/1.3 / 前処理 - タイプ: GLOW DISCHARGE / 前処理 - 時間: 25 sec. / 詳細: 15 mA
凍結
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% O2 / 5% H2)..
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電子顕微鏡法
顕微鏡
TFS KRIOS
撮影
フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) 実像数: 17548 / 平均電子線量: 60.0 e/Å2 詳細: 7781 micrographs with a 20 deg pretilt to overcome preferred orientation problems
選択した数: 1557902 詳細: 1023667 from non tilted and 534235 from pretilted datasets
初期モデル
モデルのタイプ: INSILICO MODEL / In silico モデル: ModelAngelo and AlphaFold
最終 再構成
解像度のタイプ: BY AUTHOR / 解像度: 2.78 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: cryoSPARC / 使用した粒子像数: 349437
初期 角度割当
タイプ: MAXIMUM LIKELIHOOD
最終 角度割当
タイプ: MAXIMUM LIKELIHOOD
最終 3次元分類
ソフトウェア - 名称: cryoSPARC 詳細: 2D classification for the global map reconstruction and 3D classification on the masking-local refinement steps for particular regions
FSC曲線 (解像度の算出)
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原子モデル構築 1
初期モデル
Chain - Source name: AlphaFold / Chain - Initial model type: in silico model
詳細
Rigid body fitting in Chimera and Coot. Further real-space refinement in Phenix.
精密化
空間: REAL / プロトコル: AB INITIO MODEL
得られたモデル
PDB-8s7x: Methyl-coenzyme M reductase activation complex without the A2 component