ジャーナル: Structure / 年: 2026 タイトル: Structural changes shifting the redox potential of the outlying cluster N1a in respiratory complex I. 著者: Daniel Wohlwend / Thilo Seifermann / Emmanuel Gnandt / Marta Vranas / Stefan Gerhardt / Thorsten Friedrich / 要旨: Energy-converting NADH:ubiquinone oxidoreductase, respiratory complex I, is central to energy metabolism by coupling NADH oxidation and quinone reduction with proton translocation across the membrane. ...Energy-converting NADH:ubiquinone oxidoreductase, respiratory complex I, is central to energy metabolism by coupling NADH oxidation and quinone reduction with proton translocation across the membrane. Electrons are transferred from the primary acceptor flavin mononucleotide via a chain of iron-sulfur clusters to quinone. The enigmatic cluster N1a is conserved, but not part of this electron transfer chain. We reported on variants of the complex in which N1a is not detectable by EPR spectroscopy. This was tentatively attributed to the lower redox potential of the variant N1a. However, it remained an open question, whether the variants contain this cluster at all. Here, we determined the structures of these variants by X-ray crystallography and cryogenic-electron microscopy. Cluster N1a is present in all variants and the shift of its redox potential is explained by nearby structural changes. A role of the cluster for the mechanism of the complex is discussed.
A: NADH-quinone oxidoreductase subunit E B: NADH-quinone oxidoreductase subunit F ヘテロ分子
登録者・ソフトウェアが定義した集合体
根拠: light scattering, In solution, NuoEF forms an (AB)2 heterotetramer, composed of two copies of NuoEF. In native complex I, NuoEF is found as dimeric subcomplex.
分子量: 48523.301 Da / 分子数: 2 / 由来タイプ: 組換発現 詳細: The sequence AGHHHHHH is a C-terminal affinity tag not found in the wild-type protein 由来: (組換発現) Aquifex aeolicus VF5 (バクテリア) 遺伝子: nuoF / プラスミド: pET-Blue1::nuoEFhis / 発現宿主: Escherichia coli B (大腸菌) / 株 (発現宿主): BL21(DE3) / Variant (発現宿主): Rosetta2 / 参照: UniProt: O66841