登録情報 データベース : EMDB / ID : EMD-7537 構造の表示 ダウンロードとリンクタイトル Cryo-EM structure of the human SK4/calmodulin channel complex マップデータhuman SK4/calmodulin channel complex: sharpened, filtered map 詳細 試料複合体 : human SK4/calmodulin channel complexタンパク質・ペプチド : Intermediate conductance calcium-activated potassium channel protein 4タンパク質・ペプチド : Calmodulin-1リガンド : POTASSIUM IONリガンド : (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphateリガンド : DODECYL-BETA-D-MALTOSIDE 詳細 キーワード ion channel / neuroscience / calmodulin / 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
intermediate conductance calcium-activated potassium channel activity / saliva secretion / small conductance calcium-activated potassium channel activity / stabilization of membrane potential / Ca2+ activated K+ channels / macropinocytosis / calcium-activated potassium channel activity / regulation of calcium ion import across plasma membrane / positive regulation of potassium ion transmembrane transport / cell volume homeostasis ... intermediate conductance calcium-activated potassium channel activity / saliva secretion / small conductance calcium-activated potassium channel activity / stabilization of membrane potential / Ca2+ activated K+ channels / macropinocytosis / calcium-activated potassium channel activity / regulation of calcium ion import across plasma membrane / positive regulation of potassium ion transmembrane transport / cell volume homeostasis / CaM pathway / Cam-PDE 1 activation / Sodium/Calcium exchangers / Calmodulin induced events / 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 / phospholipid translocation / CREB1 phosphorylation through the activation of Adenylate Cyclase / PKA activation / CaMK IV-mediated phosphorylation of CREB / negative regulation of high voltage-gated calcium channel activity / Glycogen breakdown (glycogenolysis) / CLEC7A (Dectin-1) induces NFAT activation / Activation of RAC1 downstream of NMDARs / negative regulation of calcium ion export across plasma membrane / organelle localization by membrane tethering / mitochondrion-endoplasmic reticulum membrane tethering / autophagosome membrane docking / presynaptic endocytosis / regulation of cardiac muscle cell action potential / positive regulation of ryanodine-sensitive calcium-release channel activity / Synthesis of IP3 and IP4 in the cytosol / regulation of cell communication by electrical coupling involved in cardiac conduction / positive regulation of T cell receptor signaling pathway / Phase 0 - rapid depolarisation / Negative regulation of NMDA receptor-mediated neuronal transmission / negative regulation of ryanodine-sensitive calcium-release channel activity / Unblocking of NMDA receptors, glutamate binding and activation / RHO GTPases activate PAKs / calcineurin-mediated signaling / Ion transport by P-type ATPases / Uptake and function of anthrax toxins / Long-term potentiation / Regulation of MECP2 expression and activity / Calcineurin activates NFAT / protein phosphatase activator activity / regulation of ryanodine-sensitive calcium-release channel activity / DARPP-32 events / immune system process / Smooth Muscle Contraction / catalytic complex / potassium channel activity / detection of calcium ion / regulation of cardiac muscle contraction / RHO GTPases activate IQGAPs / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / presynaptic cytosol / calcium channel inhibitor activity / cellular response to interferon-beta / Protein methylation / Activation of AMPK downstream of NMDARs / Ion homeostasis / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / eNOS activation / regulation of calcium-mediated signaling / Tetrahydrobiopterin (BH4) synthesis, recycling, salvage and regulation / titin binding / voltage-gated potassium channel complex / potassium ion transmembrane transport / sperm midpiece / substantia nigra development / calcium channel complex / calyx of Held / FCERI mediated Ca+2 mobilization / Ras activation upon Ca2+ influx through NMDA receptor / FCGR3A-mediated IL10 synthesis / adenylate cyclase activator activity / regulation of heart rate / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / protein serine/threonine kinase activator activity / VEGFR2 mediated cell proliferation / sarcomere / regulation of cytokinesis / VEGFR2 mediated vascular permeability / positive regulation of protein secretion / Translocation of SLC2A4 (GLUT4) to the plasma membrane / positive regulation of receptor signaling pathway via JAK-STAT / spindle microtubule / establishment of localization in cell / RAF activation / Transcriptional activation of mitochondrial biogenesis / defense response / potassium ion transport / Stimuli-sensing channels / cellular response to type II interferon / long-term synaptic potentiation / ruffle membrane / response to calcium ion 類似検索 - 分子機能 Calmodulin-binding domain / Potassium channel, calcium-activated, SK / SK, calmodulin-binding domain superfamily / Calmodulin binding domain / Calcium-activated SK potassium channel / Calmodulin binding domain / Potassium channel domain / Ion channel / : / EF-hand domain pair ... Calmodulin-binding domain / Potassium channel, calcium-activated, SK / SK, calmodulin-binding domain superfamily / Calmodulin binding domain / Calcium-activated SK potassium channel / Calmodulin binding domain / Potassium channel domain / Ion channel / : / 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 / EF-hand domain pair 類似検索 - ドメイン・相同性 Intermediate conductance calcium-activated potassium channel protein 4 / Calmodulin-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 : 3.4 Å 詳細 データ登録者Lee CH / MacKinnon R 資金援助 米国, 2件 詳細 詳細を隠すOrganization Grant number 国 National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI) GM43949 米国 Howard Hughes Medical Institute (HHMI) 米国
引用ジャーナル : Science / 年 : 2018タイトル : Activation mechanism of a human SK-calmodulin channel complex elucidated by cryo-EM structures.著者 : Chia-Hsueh Lee / Roderick MacKinnon / 要旨 : Small-conductance Ca-activated K (SK) channels mediate neuron excitability and are associated with synaptic transmission and plasticity. They also regulate immune responses and the size of blood ... Small-conductance Ca-activated K (SK) channels mediate neuron excitability and are associated with synaptic transmission and plasticity. They also regulate immune responses and the size of blood cells. Activation of SK channels requires calmodulin (CaM), but how CaM binds and opens SK channels has been unclear. Here we report cryo-electron microscopy (cryo-EM) structures of a human SK4-CaM channel complex in closed and activated states at 3.4- and 3.5-angstrom resolution, respectively. Four CaM molecules bind to one channel tetramer. Each lobe of CaM serves a distinct function: The C-lobe binds to the channel constitutively, whereas the N-lobe interacts with the S4-S5 linker in a Ca-dependent manner. The S4-S5 linker, which contains two distinct helices, undergoes conformational changes upon CaM binding to open the channel pore. These structures reveal the gating mechanism of SK channels and provide a basis for understanding SK channel pharmacology. 履歴 登録 2018年3月8日 - ヘッダ(付随情報) 公開 2018年5月2日 - マップ公開 2018年5月2日 - 更新 2025年5月14日 - 現状 2025年5月14日 処理サイト : RCSB / 状態 : 公開
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