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基本情報
登録情報 | データベース: PDB / ID: 9o93 | |||||||||||||||
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タイトル | Cryo-EM structure of KCa2.2_II/calmodulin channel in complex with rimtuzalcap | |||||||||||||||
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![]() | TRANSPORT PROTEIN / Ion channel / Small-conductance calcium-activated potassium channel | |||||||||||||||
機能・相同性 | ![]() 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 / positive regulation of potassium ion transport / inward rectifier potassium channel activity / establishment of protein localization to mitochondrial membrane / type 3 metabotropic glutamate receptor binding / establishment of protein localization to membrane / regulation of potassium ion transmembrane transport ...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 / positive regulation of potassium ion transport / inward rectifier potassium channel activity / establishment of protein localization to mitochondrial membrane / 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 / 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 / regulation of synaptic vesicle exocytosis / calcineurin-mediated signaling / alpha-actinin binding / smooth endoplasmic reticulum / regulation of ryanodine-sensitive calcium-release channel activity / protein phosphatase activator activity / adenylate cyclase binding / regulation of neuronal synaptic plasticity / catalytic complex / regulation of synaptic vesicle endocytosis / detection of calcium ion / 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 / sperm midpiece / regulation of calcium-mediated signaling / voltage-gated potassium channel complex / potassium ion transmembrane transport / calcium channel complex / T-tubule / 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 / spindle microtubule / calcium channel regulator activity / positive regulation of receptor signaling pathway via JAK-STAT / response to calcium ion / sarcolemma / modulation of chemical synaptic transmission / potassium ion transport / cellular response to type II interferon / G2/M transition of mitotic cell cycle / Schaffer collateral - CA1 synapse / Z disc / spindle pole / calcium-dependent protein binding / myelin sheath / growth cone / vesicle / dendritic spine / transmembrane transporter binding / postsynaptic membrane / calmodulin binding / protein domain specific binding / neuronal cell body / calcium ion binding / centrosome / protein kinase binding / glutamatergic synapse / cell surface / protein homodimerization activity / protein-containing complex / mitochondrion / nucleoplasm / membrane / plasma membrane / cytosol / cytoplasm 類似検索 - 分子機能 | |||||||||||||||
生物種 | ![]() ![]() | |||||||||||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 2.96 Å | |||||||||||||||
![]() | Nam, Y.W. / Zhang, M. | |||||||||||||||
資金援助 | ![]()
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![]() | ![]() 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 |
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 402.3 KB | 表示 | ![]() |
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-検証レポート
文書・要旨 | ![]() | 1.5 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 1.5 MB | 表示 | |
XML形式データ | ![]() | 64.3 KB | 表示 | |
CIF形式データ | ![]() | 96.7 KB | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
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リンク
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集合体
登録構造単位 | ![]()
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要素
#1: タンパク質 | 分子量: 43349.289 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() #2: タンパク質 | 分子量: 16277.873 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() #3: 化合物 | #4: 化合物 | ChemComp-A1B92 / 分子量: 378.420 Da / 分子数: 4 / 由来タイプ: 合成 / 式: C18H24F2N6O / タイプ: SUBJECT OF INVESTIGATION #5: 水 | ChemComp-HOH / | 研究の焦点であるリガンドがあるか | Y | Has protein modification | N | |
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-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
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試料調製
構成要素 | 名称: RatKCa2.2_II/calmodulin channel in complex with rimtuzalcap タイプ: COMPLEX / Entity ID: #1-#2 / 由来: RECOMBINANT |
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分子量 | 値: 0.22973 MDa / 実験値: NO |
由来(天然) | 生物種: ![]() |
由来(組換発現) | 生物種: ![]() |
緩衝液 | pH: 8 |
試料 | 濃度: 2 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 凍結剤: ETHANE |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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顕微鏡 | モデル: TFS KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2300 nm / 最小 デフォーカス(公称値): 1300 nm |
試料ホルダ | 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
撮影 | 電子線照射量: 50 e/Å2 フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) |
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解析
EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3次元再構成 | 解像度: 2.96 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 102190 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
精密化 | 最高解像度: 2.96 Å 立体化学のターゲット値: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS) | ||||||||||||||||||||||||
拘束条件 |
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