登録情報 データベース : EMDB / ID : EMD-40508 ダウンロードとリンクタイトル KCNQ1 with voltage sensor in the up conformation マップデータ 詳細 試料複合体 : Complex of KCNQ1 (Kv7.1) channel bound to calmodulin-Ca2+タンパク質・ペプチド : Calmodulin-1タンパク質・ペプチド : Potassium voltage-gated channel subfamily KQT member 1リガンド : CALCIUM ION 詳細 キーワード voltage-gated potassium channel / MEMBRANE PROTEIN機能・相同性 機能・相同性情報分子機能 ドメイン・相同性 構成要素
gastrin-induced gastric acid secretion / corticosterone secretion / voltage-gated potassium channel activity involved in atrial cardiac muscle cell action potential repolarization / negative regulation of voltage-gated potassium channel activity / basolateral part of cell / lumenal side of membrane / negative regulation of delayed rectifier potassium channel activity / rhythmic behavior / stomach development / regulation of gastric acid secretion ... gastrin-induced gastric acid secretion / corticosterone secretion / voltage-gated potassium channel activity involved in atrial cardiac muscle cell action potential repolarization / negative regulation of voltage-gated potassium channel activity / basolateral part of cell / lumenal side of membrane / negative regulation of delayed rectifier potassium channel activity / rhythmic behavior / stomach development / regulation of gastric acid secretion / voltage-gated potassium channel activity involved in cardiac muscle cell action potential repolarization / Phase 3 - rapid repolarisation / membrane repolarization during action potential / membrane repolarization during atrial cardiac muscle cell action potential / Phase 2 - plateau phase / iodide transport / regulation of atrial cardiac muscle cell membrane repolarization / membrane repolarization during ventricular cardiac muscle cell action potential / intracellular chloride ion homeostasis / membrane repolarization during cardiac muscle cell action potential / potassium ion export across plasma membrane / voltage-gated potassium channel activity involved in ventricular cardiac muscle cell action potential repolarization / atrial cardiac muscle cell action potential / renal sodium ion absorption / regulation of membrane repolarization / auditory receptor cell development / protein phosphatase 1 binding / detection of mechanical stimulus involved in sensory perception of sound / delayed rectifier potassium channel activity / ventricular cardiac muscle cell action potential / potassium ion homeostasis / Voltage gated Potassium channels / positive regulation of potassium ion transmembrane transport / regulation of ventricular cardiac muscle cell membrane repolarization / non-motile cilium assembly / outward rectifier potassium channel activity / intestinal absorption / CaM pathway / Cam-PDE 1 activation / Sodium/Calcium exchangers / cardiac muscle cell contraction / Calmodulin induced events / inner ear morphogenesis / Reduction of cytosolic Ca++ levels / Activation of Ca-permeable Kainate Receptor / CREB1 phosphorylation through the activation of CaMKII/CaMKK/CaMKIV cascasde / Loss of phosphorylation of MECP2 at T308 / CREB1 phosphorylation through the activation of Adenylate Cyclase / negative regulation of high voltage-gated calcium channel activity / PKA activation / adrenergic receptor signaling pathway / CaMK IV-mediated phosphorylation of CREB / Glycogen breakdown (glycogenolysis) / CLEC7A (Dectin-1) induces NFAT activation / Activation of RAC1 downstream of NMDARs / negative regulation of ryanodine-sensitive calcium-release channel activity / organelle localization by membrane tethering / renal absorption / mitochondrion-endoplasmic reticulum membrane tethering / autophagosome membrane docking / ciliary base / negative regulation of calcium ion export across plasma membrane / regulation of ryanodine-sensitive calcium-release channel activity / regulation of cardiac muscle cell action potential / protein kinase A regulatory subunit binding / protein kinase A catalytic subunit binding / presynaptic endocytosis / regulation of heart contraction / Synthesis of IP3 and IP4 in the cytosol / inner ear development / potassium ion import across plasma membrane / Phase 0 - rapid depolarisation / regulation of heart rate by cardiac conduction / Negative regulation of NMDA receptor-mediated neuronal transmission / Unblocking of NMDA receptors, glutamate binding and activation / RHO GTPases activate PAKs / calcineurin-mediated signaling / monoatomic ion channel complex / regulation of cell communication by electrical coupling involved in cardiac conduction / Ion transport by P-type ATPases / Uptake and function of anthrax toxins / protein phosphatase activator activity / action potential / cochlea development / Long-term potentiation / Calcineurin activates NFAT / Regulation of MECP2 expression and activity / DARPP-32 events / Smooth Muscle Contraction / voltage-gated potassium channel activity / social behavior / detection of calcium ion / regulation of cardiac muscle contraction / positive regulation of heart rate / catalytic complex / RHO GTPases activate IQGAPs / transport vesicle / calcium channel inhibitor activity / presynaptic cytosol / cellular response to interferon-beta 類似検索 - 分子機能 Potassium channel, voltage dependent, KCNQ1 / Potassium channel, voltage dependent, KCNQ / Potassium channel, voltage dependent, KCNQ, C-terminal / KCNQ voltage-gated potassium channel / Voltage-dependent channel domain superfamily / : / EF-hand domain pair / EF-hand, calcium binding motif / EF-Hand 1, calcium-binding site / EF-hand calcium-binding domain. ... Potassium channel, voltage dependent, KCNQ1 / Potassium channel, voltage dependent, KCNQ / Potassium channel, voltage dependent, KCNQ, C-terminal / KCNQ voltage-gated potassium channel / Voltage-dependent channel domain superfamily / : / EF-hand domain pair / EF-hand, calcium binding motif / EF-Hand 1, calcium-binding site / EF-hand calcium-binding domain. / EF-hand calcium-binding domain profile. / EF-hand domain / Ion transport domain / Ion transport protein / EF-hand domain pair 類似検索 - ドメイン・相同性 Calmodulin-1 / Potassium voltage-gated channel subfamily KQT member 1 類似検索 - 構成要素生物種 Homo sapiens (ヒト)手法 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度 : 2.9 Å 詳細 データ登録者Mandala VS / MacKinnon R 資金援助 米国, 1件 詳細 詳細を隠すOrganization Grant number 国 Howard Hughes Medical Institute (HHMI) 米国
引用ジャーナル : Proc Natl Acad Sci U S A / 年 : 2023タイトル : The membrane electric field regulates the PIP-binding site to gate the KCNQ1 channel.著者 : Venkata Shiva Mandala / Roderick MacKinnon / 要旨 : Voltage-dependent ion channels underlie the propagation of action potentials and other forms of electrical activity in cells. In these proteins, voltage sensor domains (VSDs) regulate opening and ... Voltage-dependent ion channels underlie the propagation of action potentials and other forms of electrical activity in cells. In these proteins, voltage sensor domains (VSDs) regulate opening and closing of the pore through the displacement of their positive-charged S4 helix in response to the membrane voltage. The movement of S4 at hyperpolarizing membrane voltages in some channels is thought to directly clamp the pore shut through the S4-S5 linker helix. The KCNQ1 channel (also known as K7.1), which is important for heart rhythm, is regulated not only by membrane voltage but also by the signaling lipid phosphatidylinositol 4,5-bisphosphate (PIP). KCNQ1 requires PIP to open and to couple the movement of S4 in the VSD to the pore. To understand the mechanism of this voltage regulation, we use cryogenic electron microscopy to visualize the movement of S4 in the human KCNQ1 channel in lipid membrane vesicles with a voltage difference across the membrane, i.e., an applied electric field in the membrane. Hyperpolarizing voltages displace S4 in such a manner as to sterically occlude the PIP-binding site. Thus, in KCNQ1, the voltage sensor acts primarily as a regulator of PIP binding. The voltage sensors' influence on the channel's gate is indirect through the reaction sequence: voltage sensor movement → alter PIP ligand affinity → alter pore opening. 履歴 登録 2023年4月16日 - ヘッダ(付随情報) 公開 2023年5月31日 - マップ公開 2023年5月31日 - 更新 2025年5月28日 - 現状 2025年5月28日 処理サイト : RCSB / 状態 : 公開
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