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基本情報
登録情報 | データベース: PDB / ID: 5vms | |||||||||
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タイトル | CryoEM structure of Xenopus KCNQ1 channel | |||||||||
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![]() | TRANSPORT PROTEIN / CALCIUM BINDING PROTEIN / KCNQ1-CaM complex / potassium channel / Long QT syndrome | |||||||||
機能・相同性 | ![]() regulation of gastric acid secretion / membrane repolarization / : / : / positive regulation of cyclic-nucleotide phosphodiesterase activity / positive regulation of ryanodine-sensitive calcium-release channel activity / : / positive regulation of protein autophosphorylation / negative regulation of peptidyl-threonine phosphorylation / delayed rectifier potassium channel activity ...regulation of gastric acid secretion / membrane repolarization / : / : / positive regulation of cyclic-nucleotide phosphodiesterase activity / positive regulation of ryanodine-sensitive calcium-release channel activity / : / positive regulation of protein autophosphorylation / negative regulation of peptidyl-threonine phosphorylation / delayed rectifier potassium channel activity / establishment of protein localization to mitochondrial membrane / type 3 metabotropic glutamate receptor binding / outward rectifier potassium channel activity / CaM pathway / Cam-PDE 1 activation / Sodium/Calcium exchangers / positive regulation of peptidyl-threonine phosphorylation / intestinal absorption / Calmodulin induced events / Reduction of cytosolic Ca++ levels / Activation of Ca-permeable Kainate Receptor / positive regulation of DNA binding / 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 / CaMK IV-mediated phosphorylation of CREB / PKA activation / negative regulation of high voltage-gated calcium channel activity / Glycogen breakdown (glycogenolysis) / response to corticosterone / 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 cardiac muscle cell action potential / nitric-oxide synthase binding / renal absorption / presynaptic endocytosis / Synthesis of IP3 and IP4 in the cytosol / regulation of cell communication by electrical coupling involved in cardiac conduction / Phase 0 - rapid depolarisation / regulation of synaptic vesicle exocytosis / calcineurin-mediated signaling / Negative regulation of NMDA receptor-mediated neuronal transmission / Unblocking of NMDA receptors, glutamate binding and activation / RHO GTPases activate PAKs / inner ear development / Ion transport by P-type ATPases / Uptake and function of anthrax toxins / regulation of ryanodine-sensitive calcium-release channel activity / Long-term potentiation / protein phosphatase activator activity / adenylate cyclase binding / Calcineurin activates NFAT / Regulation of MECP2 expression and activity / positive regulation of protein serine/threonine kinase activity / DARPP-32 events / catalytic complex / regulation of synaptic vesicle endocytosis / monoatomic ion channel complex / Smooth Muscle Contraction / voltage-gated potassium channel activity / detection of calcium ion / regulation of cardiac muscle contraction / RHO GTPases activate IQGAPs / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / activation of adenylate cyclase activity / cellular response to interferon-beta / Protein methylation / calcium channel inhibitor activity / phosphatidylinositol 3-kinase binding / Activation of AMPK downstream of NMDARs / presynaptic cytosol / Ion homeostasis / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / positive regulation of nitric-oxide synthase activity / eNOS activation / titin binding / enzyme regulator activity / Tetrahydrobiopterin (BH4) synthesis, recycling, salvage and regulation / sperm midpiece / regulation of calcium-mediated signaling / phosphatidylinositol-4,5-bisphosphate binding / voltage-gated potassium channel complex / potassium ion transmembrane transport / calcium channel complex / substantia nigra development / FCERI mediated Ca+2 mobilization / Ras activation upon Ca2+ influx through NMDA receptor / regulation of heart rate / FCGR3A-mediated IL10 synthesis / calyx of Held / cytoplasmic vesicle membrane / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / response to amphetamine / adenylate cyclase activator activity / sarcomere 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: 3.7 Å | |||||||||
![]() | Mackinnon, R. / Sun, J. | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Cryo-EM Structure of a KCNQ1/CaM Complex Reveals Insights into Congenital Long QT Syndrome. 著者: Ji Sun / Roderick MacKinnon / ![]() 要旨: KCNQ1 is the pore-forming subunit of cardiac slow-delayed rectifier potassium (I) channels. Mutations in the kcnq1 gene are the leading cause of congenital long QT syndrome (LQTS). Here, we present ...KCNQ1 is the pore-forming subunit of cardiac slow-delayed rectifier potassium (I) channels. Mutations in the kcnq1 gene are the leading cause of congenital long QT syndrome (LQTS). Here, we present the cryoelectron microscopy (cryo-EM) structure of a KCNQ1/calmodulin (CaM) complex. The conformation corresponds to an "uncoupled," PIP-free state of KCNQ1, with activated voltage sensors and a closed pore. Unique structural features within the S4-S5 linker permit uncoupling of the voltage sensor from the pore in the absence of PIP. CaM contacts the KCNQ1 voltage sensor through a specific interface involving a residue on CaM that is mutated in a form of inherited LQTS. Using an electrophysiological assay, we find that this mutation on CaM shifts the KCNQ1 voltage-activation curve. This study describes one physiological form of KCNQ1, depolarized voltage sensors with a closed pore in the absence of PIP, and reveals a regulatory interaction between CaM and KCNQ1 that may explain CaM-mediated LQTS. | |||||||||
履歴 |
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Remark 650 | HELIX DETERMINATION METHOD: AUTHOR PROVIDED. |
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構造の表示
ムービー |
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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 | ![]() | 113.2 KB | 表示 | ![]() |
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PDB形式 | ![]() | 80.7 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
文書・要旨 | ![]() | 741 KB | 表示 | ![]() |
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文書・詳細版 | ![]() | 742.6 KB | 表示 | |
XML形式データ | ![]() | 18.8 KB | 表示 | |
CIF形式データ | ![]() | 26.9 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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対称性 | 点対称性: (シェーンフリース記号: C4 (4回回転対称)) |
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要素
#1: タンパク質 | 分子量: 62663.398 Da / 分子数: 1 / 断片: UNP residues 67-610 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 遺伝子: kcnq1, kvlqt1 / 細胞株 (発現宿主): HEK293 GnTI- / 発現宿主: ![]() |
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#2: タンパク質 | 分子量: 16852.545 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() 遺伝子: CALM1, CALM, CAM, CAM1, CALM2, CAM2, CAMB, CALM3, CALML2, CAM3, CAMC, CAMIII 発現宿主: ![]() |
#3: 化合物 |
-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: Complex of Xenopus KCNQ1 and CaM / タイプ: COMPLEX / Entity ID: #1-#2 / 由来: RECOMBINANT |
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分子量 | 値: 0.3 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: 7.2 |
試料 | 濃度: 5 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 凍結前の試料温度: 298 K / 詳細: 90-100% humidity |
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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: FEI TITAN KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD |
撮影 | 電子線照射量: 1.78 e/Å2 / 検出モード: SUPER-RESOLUTION フィルム・検出器のモデル: DIRECT ELECTRON DE-64 (8k x 8k) |
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解析
ソフトウェア | 名称: REFMAC / バージョン: 5.8.0088 / 分類: 精密化 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C4 (4回回転対称) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.7 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 69415 詳細: Entry was refined using space group P4 and cell parameters a=b=c=332.8 and alpha=beta=gamma=90. 対称性のタイプ: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
精密化 | 解像度: 3.7→122.3 Å / Cor.coef. Fo:Fc: 0.91 / SU B: 40.602 / SU ML: 0.52 立体化学のターゲット値: MAXIMUM LIKELIHOOD WITH PHASES 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
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溶媒の処理 | イオンプローブ半径: 0.8 Å / 減衰半径: 0.8 Å / VDWプローブ半径: 1.2 Å / 溶媒モデル: MASK | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
原子変位パラメータ | Biso mean: 203.149 Å2
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拘束条件 |
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