7LFW

Cryo-EM structure of human cGMP-bound open CNGA1 channel in K+/Ca2+

7LFW の概要

• エントリーDOI: 10.2210/pdb7lfw/pdb
• EMDBエントリー: 23307
• 分子名称: cGMP-gated cation channel alpha-1, CYCLIC GUANOSINE MONOPHOSPHATE, CALCIUM ION (3 entities in total)
• 機能のキーワード: alpha-helical, membrane protein, ion channel
• 由来する生物種: Homo sapiens (Human)
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 260062.71

構造登録者

Xue, J.,Han, Y.,Jiang, Y. (登録日: 2021-01-18, 公開日: 2021-03-10, 最終更新日: 2024-03-06)

主引用文献

Xue, J.,Han, Y.,Zeng, W.,Wang, Y.,Jiang, Y.
Structural mechanisms of gating and selectivity of human rod CNGA1 channel.
Neuron, 109:1302-1313.e4, 2021

PubMed Abstract: Mammalian cyclic nucleotide-gated (CNG) channels play an essential role in the signal transduction of the visual and olfactory sensory systems. Here we reveal the structural mechanism of ligand gating in human rod CNGA1 channel by determining its cryo-EM structures in both the apo closed and cGMP-bound open states. Distinct from most other members of voltage-gated tetrameric cation channels, CNGA1 forms a central channel gate in the middle of the membrane, occluding the central cavity. Structural analyses of ion binding profiles in the selectivity filters of the wild-type channel and the E365Q filter mutant allow us to unambiguously define the two Ca binding sites inside the selectivity filter, providing structural insights into Ca blockage and permeation in CNG channels. The structure of the E365Q mutant also reveals two alternative side-chain conformations at Q365, providing a plausible explanation for the voltage-dependent gating of CNG channel acquired upon E365 mutation.

PubMed: 33651975
DOI: 10.1016/j.neuron.2021.02.007

実験手法

ELECTRON MICROSCOPY (2.9 Å)