登録情報 データベース : EMDB / ID : EMD-7538 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 in the Ca2+ bound state I マップデータhuman SK4/calmodulin channel complex in the Ca2+ bound state I: 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リガンド : CALCIUM ION 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 / positive regulation of T cell receptor signaling pathway ... 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 / positive regulation of T cell receptor signaling pathway / cell volume homeostasis / CaM pathway / Cam-PDE 1 activation / Sodium/Calcium exchangers / phospholipid translocation / 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 / CREB1 phosphorylation through the activation of Adenylate Cyclase / negative regulation of high voltage-gated calcium channel activity / PKA activation / 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 / mitochondrion-endoplasmic reticulum membrane tethering / autophagosome membrane docking / negative regulation of calcium ion export across plasma membrane / regulation of ryanodine-sensitive calcium-release channel activity / regulation of cardiac muscle cell action potential / presynaptic endocytosis / Synthesis of IP3 and IP4 in the cytosol / Phase 0 - rapid depolarisation / Negative regulation of NMDA receptor-mediated neuronal transmission / Unblocking of NMDA receptors, glutamate binding and activation / RHO GTPases activate PAKs / calcineurin-mediated signaling / 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 / Long-term potentiation / Calcineurin activates NFAT / Regulation of MECP2 expression and activity / DARPP-32 events / Smooth Muscle Contraction / immune system process / potassium channel activity / detection of calcium ion / regulation of cardiac muscle contraction / catalytic complex / RHO GTPases activate IQGAPs / calcium channel inhibitor activity / presynaptic cytosol / Activation of AMPK downstream of NMDARs / cellular response to interferon-beta / Protein methylation / Ion homeostasis / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / eNOS activation / Tetrahydrobiopterin (BH4) synthesis, recycling, salvage and regulation / titin binding / regulation of calcium-mediated signaling / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / voltage-gated potassium channel complex / FCERI mediated Ca+2 mobilization / potassium ion transmembrane transport / calcium channel complex / substantia nigra development / FCGR3A-mediated IL10 synthesis / regulation of heart rate / establishment of localization in cell / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / Ras activation upon Ca2+ influx through NMDA receptor / calyx of Held / adenylate cyclase activator activity / VEGFR2 mediated cell proliferation / positive regulation of protein secretion / VEGFR2 mediated vascular permeability / regulation of cytokinesis / protein serine/threonine kinase activator activity / sarcomere / spindle microtubule / positive regulation of receptor signaling pathway via JAK-STAT / Translocation of SLC2A4 (GLUT4) to the plasma membrane / calcium channel regulator activity / potassium ion transport / defense response / Transcriptional activation of mitochondrial biogenesis / RAF activation / response to calcium ion / cellular response to type II interferon / G2/M transition of mitotic cell cycle / Stimuli-sensing channels / ruffle membrane / spindle pole 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 : 3.5 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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