登録情報 データベース : EMDB / ID : EMD-65357 ダウンロードとリンクタイトル channel A complex with 1 マップデータ 詳細 試料複合体 : channel A in complex 1タンパク質・ペプチド : Calmodulin-1タンパク質・ペプチド : Small conductance calcium-activated potassium channel protein 2タンパク質・ペプチド : Apaminリガンド : POTASSIUM IONリガンド : (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate 詳細 キーワード channel A complex with 1 / 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
negative regulation of inward rectifier potassium channel activity / negative regulation of potassium ion transmembrane transporter activity / inward rectifier potassium channel inhibitor activity / venom-mediated perturbation of biological process / small conductance calcium-activated potassium channel activity / Acetylcholine inhibits contraction of outer hair cells / membrane repolarization during atrial cardiac muscle cell action potential / negative regulation of potassium ion transmembrane transport / Ca2+ activated K+ channels / calcium-activated potassium channel activity ... negative regulation of inward rectifier potassium channel activity / negative regulation of potassium ion transmembrane transporter activity / inward rectifier potassium channel inhibitor activity / venom-mediated perturbation of biological process / small conductance calcium-activated potassium channel activity / Acetylcholine inhibits contraction of outer hair cells / membrane repolarization during atrial cardiac muscle cell action potential / negative regulation of potassium ion transmembrane transport / Ca2+ activated K+ channels / calcium-activated potassium channel activity / inward rectifier potassium channel activity / potassium channel inhibitor activity / regulation of potassium ion transmembrane transport / 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 / 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 / alpha-actinin binding / 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 / detection of calcium ion / regulation of cardiac muscle contraction / catalytic complex / RHO GTPases activate IQGAPs / calcium channel inhibitor activity / presynaptic cytosol / cellular response to interferon-beta / Activation of AMPK downstream of NMDARs / Ion homeostasis / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / Protein methylation / 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 / 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 / regulation of cytokinesis / VEGFR2 mediated vascular permeability / sarcomere / protein serine/threonine kinase activator activity / 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 / 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 / Z disc / spindle pole / Signaling by RAF1 mutants / calcium-dependent protein binding / RAS processing 類似検索 - 分子機能 Honey bee toxin / Honey bee toxin / 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 ... Honey bee toxin / Honey bee toxin / 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 Apamin / Calmodulin-1 / Small conductance calcium-activated potassium channel protein 2 類似検索 - 構成要素生物種 Homo sapiens (ヒト) / Apis mellifera (セイヨウミツバチ)手法 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度 : 3.23 Å 詳細 データ登録者Jiang DH / Ma B 資金援助 中国, 1件 詳細 詳細を隠すOrganization Grant number 国 National Natural Science Foundation of China (NSFC) 31971134 中国
引用ジャーナル : Nat Commun / 年 : 2026タイトル : Structural mechanisms for inhibition and activation of human small-conductance Ca-activated potassium channel SK2.著者 : Bao Ma / Di Wu / En Cao / Cheng Chi / Zhihao Wang / Zhanyi Xia / Long-Hua Sun / Bingxing Pan / Daohua Jiang / Wenhua Zhang / 要旨 : The small-conductance calcium-activated potassium (SK1-3 or K2) channels regulate the intrinsic excitability and firing frequency of excitable cells. SK channels are modulated by a variety of ... The small-conductance calcium-activated potassium (SK1-3 or K2) channels regulate the intrinsic excitability and firing frequency of excitable cells. SK channels are modulated by a variety of distinct modulators; however, the underlying mechanisms remain elusive. Here, we present four cryoelectron microscopy structures of the human SK2-calmodulin complex bound with apamin, UCL1684, AP30663, and CAD-1883, elucidating their distinct binding sites and regulatory mechanisms. Apamin and UCL1684 compete for a similar binding site above the selectivity filter, which is formed by the distinct S3-S4 linker of SK2. CAD-1883 glues the N-lobe of calmodulin and the S4-S5 linker of SK2, reinforcing the open state. In contrast, AP30663 resides in the central cavity of SK2, blocking ion conductance. This study reveals multiple modulation sites in SK2 and the molecular mechanisms for the inhibition and potentiation of SK channels, which could advance rational drug design targeting SK2 channel for the treatment of cardiovascular and neurological disorders. 履歴 登録 2025年7月12日 - ヘッダ(付随情報) 公開 2026年3月11日 - マップ公開 2026年3月11日 - 更新 2026年3月11日 - 現状 2026年3月11日 処理サイト : PDBc / 状態 : 公開
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