6WEJ

Structure of cGMP-unbound WT TAX-4 reconstituted in lipid nanodiscs

6WEJ の概要

• エントリーDOI: 10.2210/pdb6wej/pdb
• EMDBエントリー: 21649
• 分子名称: Cyclic nucleotide-gated cation channel, 1-PALMITOYL-2-LINOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE, 1,2-DILAUROYL-SN-GLYCERO-3-PHOSPHATE, ... (4 entities in total)
• 機能のキーワード: ion channel, vision, olfaction, phototransduction, blindness, lipid nanodiscs, membrane protein
• 由来する生物種: Caenorhabditis elegans
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 358464.27

構造登録者

Zheng, X.,Fu, Z.,Su, D.,Zhang, Y.,Li, M.,Pan, Y.,Li, H.,Li, S.,Grassucci, R.A.,Ren, Z.,Hu, Z.,Li, X.,Zhou, M.,Li, G.,Frank, J.,Yang, J. (登録日: 2020-04-02, 公開日: 2020-06-03, 最終更新日: 2024-11-20)

主引用文献

Zheng, X.,Fu, Z.,Su, D.,Zhang, Y.,Li, M.,Pan, Y.,Li, H.,Li, S.,Grassucci, R.A.,Ren, Z.,Hu, Z.,Li, X.,Zhou, M.,Li, G.,Frank, J.,Yang, J.
Mechanism of ligand activation of a eukaryotic cyclic nucleotide-gated channel.
Nat.Struct.Mol.Biol., 27:625-634, 2020

PubMed Abstract: Cyclic nucleotide-gated (CNG) channels convert cyclic nucleotide (CN) binding and unbinding into electrical signals in sensory receptors and neurons. The molecular conformational changes underpinning ligand activation are largely undefined. We report both closed- and open-state atomic cryo-EM structures of a full-length Caenorhabditis elegans cyclic GMP-activated channel TAX-4, reconstituted in lipid nanodiscs. These structures, together with computational and functional analyses and a mutant channel structure, reveal a double-barrier hydrophobic gate formed by two S6 amino acids in the central cavity. cGMP binding produces global conformational changes that open the cavity gate located ~52 Å away but do not alter the structure of the selectivity filter-the commonly presumed activation gate. Our work provides mechanistic insights into the allosteric gating and regulation of CN-gated and nucleotide-modulated channels and CNG channel-related channelopathies.

PubMed: 32483338
DOI: 10.1038/s41594-020-0433-5

実験手法

ELECTRON MICROSCOPY (2.6 Å)