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データを開く
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基本情報
| 登録情報 | データベース: PDB / ID: 9vec | |||||||||||||||||||||
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| タイトル | structure of human KCNQ1-KCNE1-CaM complex | |||||||||||||||||||||
要素 |
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キーワード | MEMBRANE PROTEIN / potassium channel complex | |||||||||||||||||||||
| 機能・相同性 | 機能・相同性情報vestibular nucleus development / negative regulation of protein targeting to membrane / secretory granule organization / gastrin-induced gastric acid secretion / corticosterone secretion / voltage-gated potassium channel activity involved in atrial cardiac muscle cell action potential repolarization / basolateral part of cell / lumenal side of membrane / negative regulation of voltage-gated potassium channel activity / rhythmic behavior ...vestibular nucleus development / negative regulation of protein targeting to membrane / secretory granule organization / gastrin-induced gastric acid secretion / corticosterone secretion / voltage-gated potassium channel activity involved in atrial cardiac muscle cell action potential repolarization / basolateral part of cell / lumenal side of membrane / negative regulation of voltage-gated potassium channel activity / rhythmic behavior / stomach development / regulation of gastric acid secretion / voltage-gated potassium channel activity involved in cardiac muscle cell action potential repolarization / iodide transport / Phase 3 - rapid repolarisation / regulation of potassium ion transport / membrane repolarization during atrial cardiac muscle cell action potential / membrane repolarization during action potential / telethonin binding / Phase 2 - plateau phase / regulation of atrial cardiac muscle cell membrane repolarization / intracellular chloride ion homeostasis / membrane repolarization during ventricular cardiac muscle cell action potential / negative regulation of delayed rectifier potassium channel activity / membrane repolarization during cardiac muscle cell action potential / potassium ion export across plasma membrane / renal sodium ion absorption / voltage-gated potassium channel activity involved in ventricular cardiac muscle cell action potential repolarization / atrial cardiac muscle cell action potential / auditory receptor cell development / regulation of membrane repolarization / protein phosphatase 1 binding / membrane repolarization / detection of mechanical stimulus involved in sensory perception of sound / delayed rectifier potassium channel activity / ventricular cardiac muscle cell action potential / potassium ion homeostasis / Voltage gated Potassium channels / regulation of ventricular cardiac muscle cell membrane repolarization / positive regulation of potassium ion transmembrane transport / non-motile cilium assembly / cardiac muscle cell action potential involved in contraction / outward rectifier potassium channel activity / cardiac muscle cell contraction / regulation of potassium ion transmembrane transport / epithelial cell maturation / CaM pathway / intestinal absorption / Cam-PDE 1 activation / Sodium/Calcium exchangers / Calmodulin induced events / Reduction of cytosolic Ca++ levels / Activation of Ca-permeable Kainate Receptor / CREB1 phosphorylation through the activation of CaMKII/CaMKK/CaMKIV cascasde / Loss of phosphorylation of MECP2 at T308 / inner ear morphogenesis / CREB1 phosphorylation through the activation of Adenylate Cyclase / negative regulation of high voltage-gated calcium channel activity / PKA activation / CaMK IV-mediated phosphorylation of CREB / Glycogen breakdown (glycogenolysis) / CLEC7A (Dectin-1) induces NFAT activation / adrenergic receptor signaling pathway / 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 / renal absorption / presynaptic endocytosis / ciliary base / protein kinase A catalytic subunit binding / Synthesis of IP3 and IP4 in the cytosol / regulation of heart contraction / regulation of cell communication by electrical coupling involved in cardiac conduction / protein kinase A regulatory subunit binding / Phase 0 - rapid depolarisation / potassium ion import across plasma membrane / calcineurin-mediated signaling / Negative regulation of NMDA receptor-mediated neuronal transmission / inner ear development / Unblocking of NMDA receptors, glutamate binding and activation / regulation of heart rate by cardiac conduction / RHO GTPases activate PAKs / Ion transport by P-type ATPases / Uptake and function of anthrax toxins / action potential / regulation of ryanodine-sensitive calcium-release channel activity / Long-term potentiation / protein phosphatase activator activity / cochlea development / Calcineurin activates NFAT / Regulation of MECP2 expression and activity / DARPP-32 events / social behavior / monoatomic ion channel complex / Smooth Muscle Contraction / voltage-gated potassium channel activity 類似検索 - 分子機能 | |||||||||||||||||||||
| 生物種 | Homo sapiens (ヒト) | |||||||||||||||||||||
| 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: 2.7 Å | |||||||||||||||||||||
データ登録者 | Cui, C. / Kermani, A. / Cui, J. / Sun, J. | |||||||||||||||||||||
| 資金援助 | 米国, スウェーデン, 6件
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引用 | ジャーナル: Cell Res / 年: 2025タイトル: Mechanisms of KCNQ1 gating modulation by KCNE1/3 for cell-specific function. 著者: Chenxi Cui / Lu Zhao / Ali A Kermani / Shuzong Du / Tanadet Pipatpolkai / Meiqin Jiang / Sagar Chittori / Yong Zi Tan / Jingyi Shi / Lucie Delemotte / Jianmin Cui / Ji Sun / ![]() 要旨: KCNQ1 potassium channels are essential for physiological processes such as cardiac rhythm and intestinal chloride secretion. KCNE family subunits (KCNE1-5) associate with KCNQ1, conferring distinct ...KCNQ1 potassium channels are essential for physiological processes such as cardiac rhythm and intestinal chloride secretion. KCNE family subunits (KCNE1-5) associate with KCNQ1, conferring distinct properties across various tissues. KCNQ1 activation requires membrane depolarization and phosphatidylinositol 4,5-bisphosphate (PIP2) whose cellular levels are controlled by Gαq-coupled GPCR activation. While modulation of KCNQ1's voltage-dependent activation by KCNE1/3 is well-characterized, their effects on PIP2-dependent gating of KCNQ1 via GPCR signaling remain less understood. Here we resolved structures of KCNQ1-KCNE1 and reassessed the reported KCNQ1-KCNE3 structures with and without PIP2. We revealed that KCNQ1-KCNE1/3 complexes feature two PIP2-binding sites, with KCNE1/3 contributing to a previously overlooked, uncharacterized site involving residues critical for coupling voltage sensor and pore domains. Via this site, KCNE1 and KCNE3 distinctly modulate the PIP2-dependent gating, in addition to the voltage sensitivity, of KCNQ1. Consequently, KCNE3 converts KCNQ1 into a voltage-insensitive PIP2-gated channel governed by GPCR signaling to maintain ion homeostasis in non-excitable cells. KCNE1, by significantly enhancing KCNQ1's PIP2 affinity and resistance to GPCR regulation, forms predominantly voltage-gated channels with KCNQ1 for conducting the slow-delayed rectifier current in excitable cardiac cells. Our study highlights how KCNE1/3 modulates KCNQ1 gating in different cellular contexts, providing insights into tissue-specifically targeting multi-functional channels. | |||||||||||||||||||||
| 履歴 |
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構造の表示
| 構造ビューア | 分子: Molmil Jmol/JSmol |
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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 | 9vec.cif.gz | 368.2 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb9vec.ent.gz | 275.6 KB | 表示 | PDB形式 |
| PDBx/mmJSON形式 | 9vec.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
| その他 | その他のダウンロード |
-検証レポート
| 文書・要旨 | 9vec_validation.pdf.gz | 1.3 MB | 表示 | wwPDB検証レポート |
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| 文書・詳細版 | 9vec_full_validation.pdf.gz | 1.3 MB | 表示 | |
| XML形式データ | 9vec_validation.xml.gz | 62 KB | 表示 | |
| CIF形式データ | 9vec_validation.cif.gz | 93.6 KB | 表示 | |
| アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/ve/9vec ftp://data.pdbj.org/pub/pdb/validation_reports/ve/9vec | HTTPS FTP |
-関連構造データ
| 関連構造データ | ![]() 64997MC ![]() 9veiC ![]() 9venC ![]() 9veoC ![]() 9wd8C 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 F&H 検索 |
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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: 16852.545 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: CALM1, CALM, CAM, CAM1 / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: P0DP23#2: タンパク質 | 分子量: 14664.686 Da / 分子数: 4 / Mutation: K41C / 由来タイプ: 組換発現 / 詳細: K41C mutation / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: KCNE1 / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: P15382#3: タンパク質 | 分子量: 62076.270 Da / 分子数: 4 / Mutation: I145C / 由来タイプ: 組換発現 / 詳細: 76-620, mutation with I145C / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: KCNQ1, KCNA8, KCNA9, KVLQT1 / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: P51787#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: structure of human KCNQ1-KCNE1-CaM complex without PIP2 タイプ: COMPLEX / Entity ID: #1-#3 / 由来: RECOMBINANT |
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| 分子量 | 実験値: NO |
| 由来(天然) | 生物種: Homo sapiens (ヒト) |
| 由来(組換発現) | 生物種: Homo sapiens (ヒト) |
| 緩衝液 | pH: 7.4 |
| 試料 | 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: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: OTHER |
| 電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2000 nm / 最小 デフォーカス(公称値): 500 nm |
| 撮影 | 電子線照射量: 51.18 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOCONTINUUM (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 | ||||||||||||||||||||||||
| 対称性 | 点対称性: C4 (4回回転対称) | ||||||||||||||||||||||||
| 3次元再構成 | 解像度: 2.7 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 148708 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
| 拘束条件 |
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万見について




Homo sapiens (ヒト)
米国,
スウェーデン, 6件
引用








PDBj























FIELD EMISSION GUN