Crystal structure of voltage-gated sodium channel NavAb G94C/Q150C mutant in the activated state
要素
Ion transport protein
キーワード
membrane protein / metal transport / Ion channel / ion transport protein
機能・相同性
機能・相同性情報
membrane depolarization during action potential / voltage-gated sodium channel complex / voltage-gated sodium channel activity / identical protein binding / metal ion binding 類似検索 - 分子機能
Voltage-gated cation channel calcium and sodium / Voltage-dependent channel domain superfamily / Ion transport domain / Ion transport protein 類似検索 - ドメイン・相同性
1,2-DIMYRISTOYL-SN-GLYCERO-3-PHOSPHOCHOLINE / Ion transport protein 類似検索 - 構成要素
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)
R01 NS015751
米国
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)
R01 HL112808
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
T32 GM007750
米国
Howard Hughes Medical Institute (HHMI)
米国
引用
ジャーナル: Cell / 年: 2019 タイトル: Resting-State Structure and Gating Mechanism of a Voltage-Gated Sodium Channel. 著者: Goragot Wisedchaisri / Lige Tonggu / Eedann McCord / Tamer M Gamal El-Din / Liguo Wang / Ning Zheng / William A Catterall / 要旨: Voltage-gated sodium (Na) channels initiate action potentials in nerve, muscle, and other electrically excitable cells. The structural basis of voltage gating is uncertain because the resting state ...Voltage-gated sodium (Na) channels initiate action potentials in nerve, muscle, and other electrically excitable cells. The structural basis of voltage gating is uncertain because the resting state exists only at deeply negative membrane potentials. To stabilize the resting conformation, we inserted voltage-shifting mutations and introduced a disulfide crosslink in the VS of the ancestral bacterial sodium channel NaAb. Here, we present a cryo-EM structure of the resting state and a complete voltage-dependent gating mechanism. The S4 segment of the VS is drawn intracellularly, with three gating charges passing through the transmembrane electric field. This movement forms an elbow connecting S4 to the S4-S5 linker, tightens the collar around the S6 activation gate, and prevents its opening. Our structure supports the classical "sliding helix" mechanism of voltage sensing and provides a complete gating mechanism for voltage sensor function, pore opening, and activation-gate closure based on high-resolution structures of a single sodium channel protein.
解像度: 2.75→44.04 Å / Cor.coef. Fo:Fc: 0.908 / Cor.coef. Fo:Fc free: 0.861 / SU B: 8.8 / SU ML: 0.18 / 交差検証法: THROUGHOUT / ESU R: 0.347 / ESU R Free: 0.292 / 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS