- EMDB-51158: Structure of the human two pore domain potassium ion channel TASK... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-51158
タイトル
Structure of the human two pore domain potassium ion channel TASK-3 (K2P9.1)
マップデータ
B factor sharpened map
試料
複合体: K2P9.1 homodimer
タンパク質・ペプチド: Potassium channel subfamily K member 9
リガンド: CHOLESTEROL HEMISUCCINATE
リガンド: POTASSIUM ION
キーワード
K2P / membrane protein / potassium channel / ion channel
機能・相同性
機能・相同性情報
negative regulation of aldosterone secretion / regulation of action potential firing rate / TWIK-releated acid-sensitive K+ channel (TASK) / Phase 4 - resting membrane potential / potassium ion leak channel activity / regulation of resting membrane potential / cellular response to acidic pH / outward rectifier potassium channel activity / sodium channel activity / potassium ion import across plasma membrane ...negative regulation of aldosterone secretion / regulation of action potential firing rate / TWIK-releated acid-sensitive K+ channel (TASK) / Phase 4 - resting membrane potential / potassium ion leak channel activity / regulation of resting membrane potential / cellular response to acidic pH / outward rectifier potassium channel activity / sodium channel activity / potassium ion import across plasma membrane / potassium channel activity / visual perception / potassium ion transport / synaptic vesicle / mitochondrial inner membrane / protein heterodimerization activity / dendrite / metal ion binding / identical protein binding / plasma membrane 類似検索 - 分子機能
Potassium channel subfamily K member 9 / Two pore domain potassium channel, TASK family / Two pore domain potassium channel / Potassium channel domain / Ion channel 類似検索 - ドメイン・相同性
Potassium channel subfamily K member 9 類似検索 - 構成要素
Biotechnology and Biological Sciences Research Council (BBSRC)
BB/T002018/1
英国
Biotechnology and Biological Sciences Research Council (BBSRC)
BB/S008608/1
英国
Medical Research Council (MRC, United Kingdom)
MR/W017741/1
英国
引用
ジャーナル: Structure / 年: 2025 タイトル: Structures of TASK-1 and TASK-3 K2P channels provide insight into their gating and dysfunction in disease. 著者: Peter Rory Hall / Thibault Jouen-Tachoire / Marcus Schewe / Peter Proks / Thomas Baukrowitz / Elisabeth P Carpenter / Simon Newstead / Karin E J Rödström / Stephen J Tucker / 要旨: TASK-1 and TASK-3 are pH-sensitive two-pore domain (K2P/KCNK) K channels. Their functional roles make them promising targets for treatment of multiple disorders including sleep apnea, pain, and ...TASK-1 and TASK-3 are pH-sensitive two-pore domain (K2P/KCNK) K channels. Their functional roles make them promising targets for treatment of multiple disorders including sleep apnea, pain, and atrial fibrillation. Mutations in these channels are also associated with neurodevelopmental and hypertensive disorders. A previous crystal structure of TASK-1 revealed a lower "X-gate" as a hotspot for missense gain-of-function (GoF) mutations associated with DDSA (developmental delay with sleep apnea). However, the mechanisms of gating in TASK channels are still not fully understood. Here, we resolve structures for both human TASK-1 and TASK-3 by cryoelectron microscopy (cryo-EM), as well as a recurrent TASK-3 variant (G236R) associated with KCNK9 imprinting syndrome (KIS) (formerly known as Birk-Barel syndrome). Combined with functional studies of the X-gating mechanism, we provide evidence for how a highly conserved gating mechanism becomes defective in disease, and also provide further insight into the pathway of conformational changes that underlie the pH-dependent inhibition of TASK channel activity.
タンパク質・ペプチド: Potassium channel subfamily K member 9
リガンド: CHOLESTEROL HEMISUCCINATE
リガンド: POTASSIUM ION
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超分子 #1: K2P9.1 homodimer
超分子
名称: K2P9.1 homodimer / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1 詳細: Protein generated by removal of the 10xHis and FLAG purification tags with 3C protease cleavage
由来(天然)
生物種: Homo sapiens (ヒト)
分子量
理論値: 610 KDa
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分子 #1: Potassium channel subfamily K member 9
分子
名称: Potassium channel subfamily K member 9 / タイプ: protein_or_peptide / ID: 1 詳細: M1 to D259, with a HRV 3C protease site. Fused purification tags were cleaved prior to EM sample preparation. コピー数: 2 / 光学異性体: LEVO