登録情報 データベース : EMDB / ID : EMD-70240 ダウンロードとリンクタイトル Cryo-EM structure of KCa2.2_II/calmodulin channel in complex with rimtuzalcap マップデータCryo-EM map of KCa2.2_II/calmodulin channel in complex with rimtuzalcap 詳細 試料複合体 : RatKCa2.2_II/calmodulin channel in complex with rimtuzalcap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 : Calmodulin-1リガンド : POTASSIUM IONリガンド : Rimtuzalcapリガンド : water 詳細 キーワード Ion channel / Small-conductance calcium-activated potassium channel / 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
Ca2+ activated K+ channels / small conductance calcium-activated potassium channel activity / membrane repolarization during atrial cardiac muscle cell action potential / calcium-activated potassium channel activity / transporter inhibitor activity / positive regulation of potassium ion transport / : / inward rectifier potassium channel activity / type 3 metabotropic glutamate receptor binding / establishment of protein localization to membrane ... Ca2+ activated K+ channels / small conductance calcium-activated potassium channel activity / membrane repolarization during atrial cardiac muscle cell action potential / calcium-activated potassium channel activity / transporter inhibitor activity / positive regulation of potassium ion transport / : / inward rectifier potassium channel activity / type 3 metabotropic glutamate receptor binding / establishment of protein localization to membrane / regulation of potassium ion transmembrane transport / negative regulation of ryanodine-sensitive calcium-release channel activity / organelle localization by membrane tethering / response to corticosterone / mitochondrion-endoplasmic reticulum membrane tethering / autophagosome membrane docking / regulation of synaptic vesicle exocytosis / 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 / smooth endoplasmic reticulum / alpha-actinin binding / calcineurin-mediated signaling / nitric-oxide synthase binding / regulation of cell communication by electrical coupling involved in cardiac conduction / adenylate cyclase binding / protein phosphatase activator activity / regulation of neuronal synaptic plasticity / regulation of synaptic vesicle endocytosis / monoatomic ion channel activity / detection of calcium ion / regulation of cardiac muscle contraction / postsynaptic cytosol / cell surface receptor signaling pathway via JAK-STAT / catalytic complex / phosphatidylinositol 3-kinase binding / calcium channel inhibitor activity / presynaptic cytosol / cellular response to interferon-beta / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / titin binding / monoatomic ion transport / regulation of calcium-mediated signaling / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / voltage-gated potassium channel complex / potassium ion transmembrane transport / calcium channel complex / T-tubule / regulation of heart rate / calyx of Held / nitric-oxide synthase regulator activity / adenylate cyclase activator activity / response to amphetamine / regulation of cytokinesis / sarcomere / protein serine/threonine kinase activator activity / spindle microtubule / positive regulation of receptor signaling pathway via JAK-STAT / calcium channel regulator activity / potassium ion transport / response to calcium ion / sarcolemma / cellular response to type II interferon / modulation of chemical synaptic transmission / G2/M transition of mitotic cell cycle / Schaffer collateral - CA1 synapse / Z disc / spindle pole / calcium-dependent protein binding / myelin sheath / synaptic vesicle membrane / growth cone / sperm midpiece / vesicle / dendritic spine / transmembrane transporter binding / calmodulin binding / postsynaptic membrane / protein domain specific binding / neuronal cell body / calcium ion binding / centrosome / protein kinase binding / chromatin / glutamatergic synapse / cell surface / protein homodimerization activity / protein-containing complex / mitochondrion / nucleoplasm / membrane / nucleus / plasma membrane / cytoplasm / cytosol 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 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) / 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 : 2.96 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17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 2026年2月11日 - 現状 2026年2月11日 処理サイト : RCSB / 状態 : 公開
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