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-Structure paper
タイトル | Cryo-EM structures of mitochondrial respiratory complex I from . |
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ジャーナル・号・ページ | Elife, Vol. 12, Year 2023 |
掲載日 | 2023年1月9日 |
著者 | Ahmed-Noor A Agip / Injae Chung / Alvaro Sanchez-Martinez / Alexander J Whitworth / Judy Hirst / |
PubMed 要旨 | Respiratory complex I powers ATP synthesis by oxidative phosphorylation, exploiting the energy from NADH oxidation by ubiquinone to drive protons across an energy-transducing membrane. is a ...Respiratory complex I powers ATP synthesis by oxidative phosphorylation, exploiting the energy from NADH oxidation by ubiquinone to drive protons across an energy-transducing membrane. is a candidate model organism for complex I due to its high evolutionary conservation with the mammalian enzyme, well-developed genetic toolkit, and complex physiology for studies in specific cell types and tissues. Here, we isolate complex I from and determine its structure, revealing a 43-subunit assembly with high structural homology to its 45-subunit mammalian counterpart, including a hitherto unknown homologue to subunit NDUFA3. The major conformational state of the enzyme is the mammalian-type 'ready-to-go' active resting state, with a fully ordered and enclosed ubiquinone-binding site, but a subtly altered global conformation related to changes in subunit ND6. The mammalian-type 'deactive' pronounced resting state is not observed: in two minor states, the ubiquinone-binding site is unchanged, but a deactive-type π-bulge is present in ND6-TMH3. Our detailed structural knowledge of complex I provides a foundation for new approaches to disentangle mechanisms of complex I catalysis and regulation in bioenergetics and physiology. |
リンク | Elife / PubMed:36622099 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.28 - 3.96 Å |
構造データ | EMDB-15936, PDB-8b9z: EMDB-15937, PDB-8ba0: EMDB-15938: Drosophila melanogaster complex I in the Cracked state (Dm3) |
化合物 | ChemComp-PC1: ChemComp-3PE: ChemComp-SF4: ChemComp-CDL: ChemComp-FES: ChemComp-FMN: ChemComp-NA: ChemComp-UQ9: ChemComp-DGT: ChemComp-NDP: ChemComp-ZN: ChemComp-EHZ: |
由来 |
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キーワード | OXIDOREDUCTASE / Mitochondrial complex I / Respiratory complex I / NADH:ubiquinone oxidoreductase / Ubiquinone |