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基本情報
登録情報 | データベース: PDB / ID: 9ed1 | |||||||||||||||
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タイトル | Cryo-EM structure of the human KCa3.1/calmodulin channel in complex with Ca2+ and 1,4-dihydropyridine (DHP-103) | |||||||||||||||
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![]() | TRANSPORT PROTEIN / Ion channel / Membrane protein / Ca-binding protein | |||||||||||||||
機能・相同性 | ![]() 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 / establishment of protein localization to mitochondrial membrane / type 3 metabotropic glutamate receptor binding ...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 / establishment of protein localization to mitochondrial membrane / type 3 metabotropic glutamate receptor binding / positive regulation of potassium ion transmembrane transport / establishment of protein localization to membrane / cell volume homeostasis / phospholipid translocation / nitric-oxide synthase binding / organelle localization by membrane tethering / mitochondrion-endoplasmic reticulum membrane tethering / autophagosome membrane docking / regulation of synaptic vesicle exocytosis / presynaptic endocytosis / regulation of cardiac muscle cell action potential / positive regulation of T cell receptor signaling pathway / negative regulation of ryanodine-sensitive calcium-release channel activity / calcineurin-mediated signaling / regulation of synaptic vesicle endocytosis / protein phosphatase activator activity / postsynaptic cytosol / adenylate cyclase binding / regulation of ryanodine-sensitive calcium-release channel activity / immune system process / catalytic complex / potassium channel activity / detection of calcium ion / regulation of cardiac muscle contraction / phosphatidylinositol 3-kinase binding / presynaptic cytosol / calcium channel inhibitor activity / cellular response to interferon-beta / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / titin binding / voltage-gated potassium channel complex / calcium channel regulator activity / potassium ion transmembrane transport / sperm midpiece / calcium channel complex / calyx of Held / nitric-oxide synthase regulator activity / response to amphetamine / adenylate cyclase activator activity / regulation of heart rate / protein serine/threonine kinase activator activity / sarcomere / regulation of cytokinesis / positive regulation of protein secretion / positive regulation of receptor signaling pathway via JAK-STAT / spindle microtubule / establishment of localization in cell / defense response / potassium ion transport / Schaffer collateral - CA1 synapse / cellular response to type II interferon / ruffle membrane / response to calcium ion / spindle pole / calcium ion transport / calcium-dependent protein binding / G2/M transition of mitotic cell cycle / myelin sheath / growth cone / protein phosphatase binding / protein homotetramerization / vesicle / transmembrane transporter binding / calmodulin binding / neuron projection / protein domain specific binding / neuronal cell body / centrosome / calcium ion binding / protein kinase binding / protein homodimerization activity / protein-containing complex / mitochondrion / nucleoplasm / 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: 3.5 Å | |||||||||||||||
![]() | Nam, Y.W. / Zhang, M. | |||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Design and structural basis of selective 1,4-dihydropyridine inhibitors of the calcium-activated potassium channel K3.1. 著者: Seow Theng Ong / Young-Woo Nam / Joshua A Nasburg / Alena Ramanishka / Xuan Rui Ng / Zhong Zhuang / Stephanie Shee Min Goay / Hai M Nguyen / Latika Singh / Vikrant Singh / Alicia Rivera / M ...著者: Seow Theng Ong / Young-Woo Nam / Joshua A Nasburg / Alena Ramanishka / Xuan Rui Ng / Zhong Zhuang / Stephanie Shee Min Goay / Hai M Nguyen / Latika Singh / Vikrant Singh / Alicia Rivera / M Elaine Eyster / Yang Xu / Seth L Alper / Heike Wulff / Miao Zhang / K George Chandy / ![]() ![]() 要旨: The 1,4-dihydropyridines, drugs with well-established bioavailability and toxicity profiles, have proven efficacy in treating human hypertension, peripheral vascular disorders, and coronary artery ...The 1,4-dihydropyridines, drugs with well-established bioavailability and toxicity profiles, have proven efficacy in treating human hypertension, peripheral vascular disorders, and coronary artery disease. Every 1,4-dihydropyridine in clinical use blocks L-type voltage-gated calcium channels. We now report our development, using selective optimization of a side activity (SOSA), of a class of 1,4-dihydropyridines that selectively and potently inhibit the intermediate-conductance calcium-activated K channel K3.1, a validated therapeutic target for diseases affecting many organ systems. One of these 1,4-dihydropyridines, DHP-103, blocked K3.1 with an IC of 6 nM and exhibited exquisite selectivity over calcium channels and a panel of >100 additional molecular targets. Using high-resolution structure determination by cryogenic electron microscopy together with mutagenesis and electrophysiology, we delineated the drug binding pocket for DHP-103 within the water-filled central cavity of the K3.1 channel pore, where bound drug directly impedes ion permeation. DHP-103 inhibited gain-of-function mutant K3.1 channels that cause hereditary xerocytosis, suggesting its potential use as a therapeutic for this hemolytic anemia. In a rat model of acute ischemic stroke, the second leading cause of death worldwide, DHP-103 administered 12 h postischemic insult in proof-of-concept studies reduced infarct volume, improved balance beam performance (measure of proprioception) and decreased numbers of activated microglia in infarcted areas. K3.1-selective 1,4-dihydropyridines hold promise for the many diseases for which K3.1 has been experimentally confirmed as a therapeutic target. | |||||||||||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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ダウンロードとリンク
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ダウンロード
PDBx/mmCIF形式 | ![]() | 343.7 KB | 表示 | ![]() |
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PDB形式 | ![]() | 280 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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-関連構造データ
関連構造データ | ![]() 47930MC M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 ( |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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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: 42598.633 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: 16406.004 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() #3: 化合物 | ChemComp-K / #4: 化合物 | ChemComp-CA / 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: Human SK4-CaM channel complex in the presence of calcium. タイプ: COMPLEX / Entity ID: #1-#2 / 由来: MULTIPLE SOURCES |
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分子量 | 値: 0.23166 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: GATAN K3 (6k 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: 3.5 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 109449 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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