5MUO

X-ray structure of the 2-22' locally-closed mutant of GLIC in complex with propofol

5MUO の概要

• エントリーDOI: 10.2210/pdb5muo/pdb
• 関連するPDBエントリー: 3TLS 3TLT 3TLU 3TLW
• 分子名称: Proton-gated ion channel, DODECYL-BETA-D-MALTOSIDE, CHLORIDE ION, ... (6 entities in total)
• 機能のキーワード: membrane protein, transport protein
• 由来する生物種: Gloeobacter violaceus
• タンパク質・核酸の鎖数: 5
• 化学式量合計: 183731.94

構造登録者

Fourati, Z.,Ruza, R.R.,Delarue, M. (登録日: 2017-01-13, 公開日: 2018-02-14, 最終更新日: 2024-11-06)

主引用文献

Fourati, Z.,Howard, R.J.,Heusser, S.A.,Hu, H.,Ruza, R.R.,Sauguet, L.,Lindahl, E.,Delarue, M.
Structural Basis for a Bimodal Allosteric Mechanism of General Anesthetic Modulation in Pentameric Ligand-Gated Ion Channels.
Cell Rep, 23:993-1004, 2018

PubMed Abstract: Ion channel modulation by general anesthetics is a vital pharmacological process with implications for receptor biophysics and drug development. Functional studies have implicated conserved sites of both potentiation and inhibition in pentameric ligand-gated ion channels, but a detailed structural mechanism for these bimodal effects is lacking. The prokaryotic model protein GLIC recapitulates anesthetic modulation of human ion channels, and it is accessible to structure determination in both apparent open and closed states. Here, we report ten X-ray structures and electrophysiological characterization of GLIC variants in the presence and absence of general anesthetics, including the surgical agent propofol. We show that general anesthetics can allosterically favor closed channels by binding in the pore or favor open channels via various subsites in the transmembrane domain. Our results support an integrated, multi-site mechanism for allosteric modulation, and they provide atomic details of both potentiation and inhibition by one of the most common general anesthetics.

PubMed: 29694907
DOI: 10.1016/j.celrep.2018.03.108

実験手法

X-RAY DIFFRACTION (3.19 Å)