8GTR

CryoEM structure of human Pannexin isoform 3

8GTR の概要

• エントリーDOI: 10.2210/pdb8gtr/pdb
• EMDBエントリー: 34265
• 分子名称: Pannexin-3, 2-acetamido-2-deoxy-beta-D-glucopyranose, PHOSPHATIDYLETHANOLAMINE (3 entities in total)
• 機能のキーワード: pannexins, large pore ion-channels, membrane protein
• 由来する生物種: Homo sapiens (human)
• タンパク質・核酸の鎖数: 7
• 化学式量合計: 319826.26

構造登録者

Hussain, N.,Penmatsa, A. (登録日: 2022-09-08, 公開日: 2024-02-28, 最終更新日: 2024-10-30)

主引用文献

Hussain, N.,Apotikar, A.,Pidathala, S.,Mukherjee, S.,Burada, A.P.,Sikdar, S.K.,Vinothkumar, K.R.,Penmatsa, A.
Cryo-EM structures of pannexin 1 and 3 reveal differences among pannexin isoforms.
Nat Commun, 15:2942-2942, 2024

PubMed Abstract: Pannexins are single-membrane large-pore channels that release ions and ATP upon activation. Three isoforms of pannexins 1, 2, and 3, perform diverse cellular roles and differ in their pore lining residues. In this study, we report the cryo-EM structure of pannexin 3 at 3.9 Å and analyze its structural differences with pannexin isoforms 1 and 2. The pannexin 3 vestibule has two distinct chambers and a wider pore radius in comparison to pannexins 1 and 2. We further report two cryo-EM structures of pannexin 1, with pore substitutions W74R/R75D that mimic the pore lining residues of pannexin 2 and a germline mutant of pannexin 1, R217H at resolutions of 3.2 Å and 3.9 Å, respectively. Substitution of cationic residues in the vestibule of pannexin 1 results in reduced ATP interaction propensities to the channel. The germline mutant R217H in transmembrane helix 3 (TM3), leads to a partially constricted pore, reduced ATP interaction and weakened voltage sensitivity. The study compares the three pannexin isoform structures, the effects of substitutions of pore and vestibule-lining residues and allosteric effects of a pathological substitution on channel structure and function thereby enhancing our understanding of this vital group of ATP-release channels.

PubMed: 38580658
DOI: 10.1038/s41467-024-47142-6

実験手法

ELECTRON MICROSCOPY (3.91 Å)