3UU4

The GLIC pentameric Ligand-Gated Ion Channel Loop2-21' mutant reduced in the crystal in a locally-closed conformation (LC1 subtype)

3UU4 の概要

• エントリーDOI: 10.2210/pdb3uu4/pdb
• 関連するPDBエントリー: 3TLS 3TLT 3TLU 3TLV 3TLW 3UU3 3UU5 3UU6 3UU8 3UUB
• 分子名称: Glr4197 protein, DODECYL-BETA-D-MALTOSIDE (3 entities in total)
• 機能のキーワード: cys-loop receptor family, membrane protein, transport protein
• 由来する生物種: Gloeobacter violaceus
• 細胞内の位置: Cell inner membrane; Multi-pass membrane protein (Probable): Q7NDN8
• タンパク質・核酸の鎖数: 5
• 化学式量合計: 183135.50

構造登録者

Sauguet, L.,Nury, H.,Corringer, P.J.,Delarue, M. (登録日: 2011-11-28, 公開日: 2012-05-16, 最終更新日: 2023-09-13)

主引用文献

Prevost, M.S.,Sauguet, L.,Nury, H.,Van Renterghem, C.,Huon, C.,Poitevin, F.,Baaden, M.,Delarue, M.,Corringer, P.J.
A locally closed conformation of a bacterial pentameric proton-gated ion channel.
Nat.Struct.Mol.Biol., 19:642-649, 2012

PubMed Abstract: Pentameric ligand-gated ion channels mediate signal transduction through conformational transitions between closed-pore and open-pore states. To stabilize a closed conformation of GLIC, a bacterial proton-gated homolog from Gloeobacter violaceus whose open structure is known, we separately generated either four cross-links or two single mutations. We found all six mutants to be in the same 'locally closed' conformation using X-ray crystallography, sharing most of the features of the open form but showing a locally closed pore as a result of a concerted bending of all of its M2 helices. The mutants adopt several variant conformations of the M2-M3 loop, and in all cases an interacting lipid that is observed in the open form disappears. A single cross-linked mutant is functional, according to electrophysiology, and the locally closed structure of this mutant indicates that it has an increased flexibility. Further cross-linking, accessibility and molecular dynamics data suggest that the locally closed form is a functionally relevant conformation that occurs during allosteric gating transitions.

PubMed: 22580559
DOI: 10.1038/nsmb.2307

実験手法

X-RAY DIFFRACTION (3.05 Å)