7SQF

Structure of the human proton-activated chloride channel ASOR in activated conformation

これはPDB形式変換不可エントリーです。

7SQF の概要

• エントリーDOI: 10.2210/pdb7sqf/pdb
• EMDBエントリー: 25383
• 分子名称: Proton-activated chloride channel, 2-acetamido-2-deoxy-beta-D-glucopyranose (2 entities in total)
• 機能のキーワード: ion channel, chloride channel, membrane protein
• 由来する生物種: Homo sapiens (Human)
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 122930.64

構造登録者

Long, S.B.,Wang, C.,Delgado, B. (登録日: 2021-11-05, 公開日: 2022-02-23, 最終更新日: 2024-10-30)

主引用文献

Wang, C.,Polovitskaya, M.M.,Delgado, B.D.,Jentsch, T.J.,Long, S.B.
Gating choreography and mechanism of the human proton-activated chloride channel ASOR.
Sci Adv, 8:eabm3942-eabm3942, 2022

PubMed Abstract: The proton-activated chloride channel ASOR (TMEM206/PAC) permeates anions across cellular membranes in response to acidification, thereby enhancing acid-induced cell death and regulating endocytosis. The molecular mechanisms of pH-dependent control are not understood, in part because structural information for an activated conformation of ASOR is lacking. Here, we reconstitute function from purified protein and present a 3.1-Å-resolution cryo-electron microscopy structure of human ASOR at acidic pH in an activated conformation. The work contextualizes a previous acidic pH structure as a desensitized conformation. Combined with electrophysiological studies and high-resolution structures of resting and desensitized states, the work reveals mechanisms of proton sensing and ion pore gating. Clusters of extracellular acidic residues function as pH sensors and coalesce when protonated. Ensuing conformational changes induce metamorphosis of transmembrane helices to fashion an ion conduction pathway unique to the activated conformation. The studies identify a new paradigm of channel gating in this ubiquitous ion channel.

PubMed: 35108041
DOI: 10.1126/sciadv.abm3942

実験手法

ELECTRON MICROSCOPY (3.1 Å)