9B0X

Artemia franciscana ATP synthase state 2 (composite structure), pH 7.0

これはPDB形式変換不可エントリーです。

9B0X の概要

• エントリーDOI: 10.2210/pdb9b0x/pdb
• EMDBエントリー: 44061
• 分子名称: ATP synthase subunit c, ATP synthase subunit d, ATP synthase subunit a, ... (21 entities in total)
• 機能のキーワード: atp synthesis, complex v, mitochondria, oxidative-phosphorylation, membrane protein
• 由来する生物種: Artemia franciscana; 詳細
• タンパク質・核酸の鎖数: 28
• 化学式量合計: 685364.15

構造登録者

Mnatsakanyan, N.,Mello, J.F.R. (登録日: 2024-03-12, 公開日: 2025-03-26, 最終更新日: 2025-08-13)

主引用文献

Kumar, A.,da Fonseca Rezende E Mello, J.,Wu, Y.,Morris, D.,Mezghani, I.,Smith, E.,Rombauts, S.,Bossier, P.,Krahn, J.,Sigworth, F.J.,Mnatsakanyan, N.
Cryo-EM structure of the brine shrimp mitochondrial ATP synthase suggests an inactivation mechanism for the ATP synthase leak channel.
Cell Death Differ., 32:1518-1535, 2025

PubMed Abstract: Mammalian mitochondria undergo Ca-induced and cyclosporinA (CsA)-regulated permeability transition (mPT) by activating the mitochondrial permeability transition pore (mPTP) situated in mitochondrial inner membranes. Ca-induced prolonged openings of mPTP under certain pathological conditions result in mitochondrial swelling and rupture of the outer membrane, leading to mitochondrial dysfunction and cell death. While the exact molecular composition and structure of mPTP remain unknown, mammalian ATP synthase was reported to form voltage and Ca-activated leak channels involved in mPT. Unlike in mammals, mitochondria of the crustacean Artemia franciscana have the ability to accumulate large amounts of Ca without undergoing the mPT. Here, we performed structural and functional analysis of A. franciscana ATP synthase to study the molecular mechanism of mPTP inhibition in this organism. We found that the channel formed by the A. franciscana ATP synthase dwells predominantly in its inactive state and is insensitive to Ca, in contrast to porcine heart ATP synthase. Single-particle cryo-electron microscopy (cryo-EM) analysis revealed distinct structural features in A. franciscana ATP synthase compared with mammals. The stronger density of the e-subunit C-terminal region and its enhanced interaction with the c-ring were found in A. franciscana ATP synthase. These data suggest an inactivation mechanism of the ATP synthase leak channel and its possible contribution to the lack of mPT in this organism.

PubMed: 40108410
DOI: 10.1038/s41418-025-01476-w

実験手法

ELECTRON MICROSCOPY (2.6 Å)