登録情報 データベース : EMDB / ID : EMD-70275 ダウンロードとリンクタイトル Cryo-EM structure of KCa3.1/calmodulin channel in complex with NS309 マップデータCryo-EM map of KCa3.1/calmodulin channel in complex with NS309 詳細 試料複合体 : Human Ca3.1/calmodulin channel in complex with NS309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 : (3E)-6,7-dichloro-3-(hydroxyimino)-1,3-dihydro-2H-indol-2-oneリガンド : CALCIUM ION 詳細 キーワード Ion channel / Intermediate conductance calcium-activated potassium channel / Calmodulin binding protein / TRANSPORT 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 / Ca2+ activated K+ channels / stabilization of membrane potential / macropinocytosis / calcium-activated potassium channel activity / regulation of calcium ion import across plasma membrane / positive regulation of potassium ion transmembrane transport / establishment of protein localization to mitochondrial membrane ... intermediate conductance calcium-activated potassium channel activity / saliva secretion / small conductance calcium-activated potassium channel activity / Ca2+ activated K+ channels / stabilization of membrane potential / macropinocytosis / calcium-activated potassium channel activity / regulation of calcium ion import across plasma membrane / positive regulation of potassium ion transmembrane transport / establishment of protein localization to mitochondrial membrane / type 3 metabotropic glutamate receptor binding / establishment of protein localization to membrane / cell volume homeostasis / phospholipid translocation / 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 cardiac muscle cell action potential / nitric-oxide synthase binding / presynaptic endocytosis / positive regulation of T cell receptor signaling pathway / regulation of synaptic vesicle exocytosis / calcineurin-mediated signaling / regulation of ryanodine-sensitive calcium-release channel activity / protein phosphatase activator activity / adenylate cyclase binding / catalytic complex / regulation of synaptic vesicle endocytosis / detection of calcium ion / potassium channel activity / regulation of cardiac muscle contraction / postsynaptic cytosol / cellular response to interferon-beta / calcium channel inhibitor activity / phosphatidylinositol 3-kinase binding / presynaptic cytosol / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / titin binding / immune system process / sperm midpiece / regulation of calcium-mediated signaling / voltage-gated potassium channel complex / potassium ion transmembrane transport / calcium channel complex / regulation of heart rate / calyx of Held / response to amphetamine / adenylate cyclase activator activity / sarcomere / regulation of cytokinesis / protein serine/threonine kinase activator activity / nitric-oxide synthase regulator activity / positive regulation of protein secretion / spindle microtubule / calcium channel regulator activity / positive regulation of receptor signaling pathway via JAK-STAT / establishment of localization in cell / defense response / response to calcium ion / potassium ion transport / cellular response to type II interferon / G2/M transition of mitotic cell cycle / Schaffer collateral - CA1 synapse / ruffle membrane / spindle pole / calcium-dependent protein binding / calcium ion transport / myelin sheath / growth cone / vesicle / protein phosphatase binding / protein homotetramerization / transmembrane transporter binding / calmodulin binding / neuron projection / protein domain specific binding / neuronal cell body / calcium ion binding / centrosome / protein kinase binding / protein homodimerization activity / protein-containing complex / mitochondrion / nucleoplasm / plasma membrane / cytosol / cytoplasm 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) / Rattus norvegicus (ドブネズミ)手法 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度 : 3.59 Å 詳細 データ登録者Nam YW / Zhang M 資金援助 米国, 4件 詳細 詳細を隠すOrganization Grant number 国 American Heart Association 23AIREA1039423 米国 American Heart Association 24CDA1260237 米国 National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS) 4R33 NS101182-03 米国 National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS) R15 NS130420-01A1 米国
引用ジャーナル : Res Sq / 年 : 2025タイトル : Structural basis for the subtype-selectivity of K2.2 channel activators.著者 : Miao Zhang / Young-Woo Nam / Alena Ramanishka / Yang Xu / Rose Marie Yasuda / Dohyun Im / Meng Cui / George Chandy / Heike Wulff / 要旨 : Small-conductance (K2.2) and intermediate-conductance (K3.1) Ca-activated K channels are gated by a Ca-calmodulin dependent mechanism. NS309 potentiates the activity of both K2.2 and K3.1, while ... Small-conductance (K2.2) and intermediate-conductance (K3.1) Ca-activated K channels are gated by a Ca-calmodulin dependent mechanism. NS309 potentiates the activity of both K2.2 and K3.1, while rimtuzalcap selectively activates K2.2. Rimtuzalcap has been used in clinical trials for the treatment of spinocerebellar ataxia and essential tremor. We report cryo-electron microscopy structures of K2.2 channels bound with NS309 and rimtuzalcap, in addition to K3.1 channels with NS309. The different conformations of calmodulin and the cytoplasmic HC helices in the two channels underlie the subtype-selectivity of rimtuzalcap for K2.2. Calmodulin's N-lobes in the K2.2 structure are far apart and undergo conformational changes to accommodate either NS309 or rimtuzalcap. Calmodulin's Nlobes in the K3.1 structure are closer to each other and are constrained by the HC helices of K3.1, which allows binding of NS309 but not of the bulkier rimtuzalcap. These structures provide a framework for structure-based drug design targeting K2.2 channels. 履歴 登録 2025年4月19日 - ヘッダ(付随情報) 公開 2025年6月18日 - マップ公開 2025年6月18日 - 更新 2025年6月25日 - 現状 2025年6月25日 処理サイト : RCSB / 状態 : 公開
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