7VY8

Matrix arm of active state CI from Q10-NADH dataset

7VY8 の概要

• エントリーDOI: 10.2210/pdb7vy8/pdb
• EMDBエントリー: 32196
• 分子名称: NADH dehydrogenase [ubiquinone] flavoprotein 1, mitochondrial, NADH-ubiquinone oxidoreductase 9 kDa subunit, NADH dehydrogenase [ubiquinone] iron-sulfur protein 4, mitochondrial, ... (30 entities in total)
• 機能のキーワード: mammalian, mitochondrial, respiratory, complex i, electron transport
• 由来する生物種: Sus scrofa (pig); 詳細
• タンパク質・核酸の鎖数: 18
• 化学式量合計: 411209.14

構造登録者

Gu, J.K.,Yang, M.J. (登録日: 2021-11-13, 公開日: 2022-12-14)

主引用文献

Gu, J.,Liu, T.,Guo, R.,Zhang, L.,Yang, M.
The coupling mechanism of mammalian mitochondrial complex I.
Nat.Struct.Mol.Biol., 29:172-182, 2022

PubMed Abstract: Mammalian respiratory complex I (CI) is a 45-subunit, redox-driven proton pump that generates an electrochemical gradient across the mitochondrial inner membrane to power ATP synthesis in mitochondria. In the present study, we report cryo-electron microscopy structures of CI from Sus scrofa in six treatment conditions at a resolution of 2.4-3.5 Å, in which CI structures of each condition can be classified into two biochemical classes (active or deactive), with a notably higher proportion of active CI particles. These structures illuminate how hydrophobic ubiquinone-10 (Q10) with its long isoprenoid tail is bound and reduced in a narrow Q chamber comprising four different Q10-binding sites. Structural comparisons of active CI structures from our decylubiquinone-NADH and rotenone-NADH datasets reveal that Q10 reduction at site 1 is not coupled to proton pumping in the membrane arm, which might instead be coupled to Q10 oxidation at site 2. Our data overturn the widely accepted previous proposal about the coupling mechanism of CI.

PubMed: 35145322
DOI: 10.1038/s41594-022-00722-w

実験手法

ELECTRON MICROSCOPY (2.6 Å)