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基本情報
登録情報 | データベース: EMDB / ID: EMD-20966 | |||||||||
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タイトル | structure of human KCNQ1-KCNE3-CaM complex | |||||||||
![]() | human KCNQ1-KCNE3-CaM | |||||||||
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![]() | potassium channel / KCNQ1 / CaM / MEMBRANE PROTEIN | |||||||||
機能・相同性 | ![]() negative regulation of membrane repolarization during ventricular cardiac muscle cell action potential / 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 / negative regulation of potassium ion export across plasma membrane / iodide transport ...negative regulation of membrane repolarization during ventricular cardiac muscle cell action potential / 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 / negative regulation of potassium ion export across plasma membrane / iodide transport / regulation of gastric acid secretion / stomach development / voltage-gated potassium channel activity involved in cardiac muscle cell action potential repolarization / membrane repolarization during atrial cardiac muscle cell action potential / Phase 3 - rapid repolarisation / membrane repolarization during action potential / regulation of atrial cardiac muscle cell membrane repolarization / Phase 2 - plateau phase / intracellular chloride ion homeostasis / membrane repolarization during ventricular cardiac muscle cell action potential / membrane repolarization during cardiac muscle cell action potential / negative regulation of delayed rectifier potassium channel activity / renal sodium ion absorption / detection of mechanical stimulus involved in sensory perception of sound / auditory receptor cell development / potassium ion export across plasma membrane / atrial cardiac muscle cell action potential / voltage-gated potassium channel activity involved in ventricular cardiac muscle cell action potential repolarization / regulation of membrane repolarization / protein phosphatase 1 binding / delayed rectifier potassium channel activity / positive regulation of potassium ion transmembrane transport / ventricular cardiac muscle cell action potential / Voltage gated Potassium channels / potassium ion homeostasis / non-motile cilium assembly / regulation of ventricular cardiac muscle cell membrane repolarization / cardiac muscle cell contraction / outward rectifier potassium channel activity / 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 / CREB1 phosphorylation through the activation of Adenylate Cyclase / inner ear morphogenesis / PKA activation / CaMK IV-mediated phosphorylation of CREB / negative regulation of high voltage-gated calcium channel activity / neuronal cell body membrane / Glycogen breakdown (glycogenolysis) / sodium ion transport / CLEC7A (Dectin-1) induces NFAT activation / Activation of RAC1 downstream of NMDARs / negative regulation of calcium ion export across plasma membrane / organelle localization by membrane tethering / mitochondrion-endoplasmic reticulum membrane tethering / adrenergic receptor signaling pathway / autophagosome membrane docking / cochlea development / presynaptic endocytosis / renal absorption / regulation of heart contraction / regulation of cardiac muscle cell action potential / ciliary base / positive regulation of ryanodine-sensitive calcium-release channel activity / Synthesis of IP3 and IP4 in the cytosol / protein kinase A regulatory subunit binding / regulation of cell communication by electrical coupling involved in cardiac conduction / Phase 0 - rapid depolarisation / protein kinase A catalytic subunit binding / Negative regulation of NMDA receptor-mediated neuronal transmission / negative regulation of ryanodine-sensitive calcium-release channel activity / social behavior / potassium ion import across plasma membrane / Unblocking of NMDA receptors, glutamate binding and activation / RHO GTPases activate PAKs / calcineurin-mediated signaling / inner ear development / regulation of heart rate by cardiac conduction / Ion transport by P-type ATPases / Uptake and function of anthrax toxins / action potential / Long-term potentiation / Regulation of MECP2 expression and activity / Calcineurin activates NFAT / protein phosphatase activator activity / regulation of ryanodine-sensitive calcium-release channel activity / DARPP-32 events / voltage-gated potassium channel activity / monoatomic ion channel complex / Smooth Muscle Contraction / catalytic complex / detection of calcium ion / regulation of cardiac muscle contraction / RHO GTPases activate IQGAPs 類似検索 - 分子機能 | |||||||||
生物種 | ![]() | |||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.1 Å | |||||||||
![]() | Mackinnon R / Sun J | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Structural Basis of Human KCNQ1 Modulation and Gating. 著者: Ji Sun / Roderick MacKinnon / ![]() 要旨: KCNQ1, also known as Kv7.1, is a voltage-dependent K channel that regulates gastric acid secretion, salt and glucose homeostasis, and heart rhythm. Its functional properties are regulated in a tissue- ...KCNQ1, also known as Kv7.1, is a voltage-dependent K channel that regulates gastric acid secretion, salt and glucose homeostasis, and heart rhythm. Its functional properties are regulated in a tissue-specific manner through co-assembly with beta subunits KCNE1-5. In non-excitable cells, KCNQ1 forms a complex with KCNE3, which suppresses channel closure at negative membrane voltages that otherwise would close it. Pore opening is regulated by the signaling lipid PIP2. Using cryoelectron microscopy (cryo-EM), we show that KCNE3 tucks its single-membrane-spanning helix against KCNQ1, at a location that appears to lock the voltage sensor in its depolarized conformation. Without PIP2, the pore remains closed. Upon addition, PIP2 occupies a site on KCNQ1 within the inner membrane leaflet, which triggers a large conformational change that leads to dilation of the pore's gate. It is likely that this mechanism of PIP2 activation is conserved among Kv7 channels. | |||||||||
履歴 |
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構造の表示
ムービー |
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構造ビューア | EMマップ: ![]() ![]() ![]() |
添付画像 |
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マップデータ | ![]() | 93.9 MB | ![]() | |
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ヘッダ (付随情報) | ![]() ![]() | 17.2 KB 17.2 KB | 表示 表示 | ![]() |
画像 | ![]() | 176.9 KB | ||
Filedesc metadata | ![]() | 6.5 KB | ||
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
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「今月の分子」の関連する項目 |
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マップ
ファイル | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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注釈 | human KCNQ1-KCNE3-CaM | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
投影像・断面図 | 画像のコントロール
画像は Spider により作成 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 1.03 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
CCP4マップ ヘッダ情報:
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-添付データ
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試料の構成要素
-全体 : KCNQ1-CaM complex
全体 | 名称: KCNQ1-CaM complex |
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要素 |
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-超分子 #1: KCNQ1-CaM complex
超分子 | 名称: KCNQ1-CaM complex / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#3 |
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由来(天然) | 生物種: ![]() |
-分子 #1: Potassium voltage-gated channel subfamily KQT member 1
分子 | 名称: Potassium voltage-gated channel subfamily KQT member 1 タイプ: protein_or_peptide / ID: 1 / コピー数: 4 / 光学異性体: LEVO |
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由来(天然) | 生物種: ![]() |
分子量 | 理論値: 63.258574 KDa |
組換発現 | 生物種: ![]() |
配列 | 文字列: MASDLGPRPP VSLDPRVSIY STRRPVLART HVQGRVYNFL ERPTGWKCFV YHFAVFLIVL VCLIFSVLST IEQYAALATG TLFWMEIVL VVFFGTEYVV RLWSAGCRSK YVGLWGRLRF ARKPISIIDL IVVVASMVVL CVGSKGQVFA TSAIRGIRFL Q ILRMLHVD ...文字列: MASDLGPRPP VSLDPRVSIY STRRPVLART HVQGRVYNFL ERPTGWKCFV YHFAVFLIVL VCLIFSVLST IEQYAALATG TLFWMEIVL VVFFGTEYVV RLWSAGCRSK YVGLWGRLRF ARKPISIIDL IVVVASMVVL CVGSKGQVFA TSAIRGIRFL Q ILRMLHVD RQGGTWRLLG SVVFIHRQEL ITTLYIGFLG LIFSSYFVYL AEKDAVNESG RVEFGSYADA LWWGVVTVTT IG YGDKVPQ TWVGKTIASC FSVFAISFFA LPAGILGSGF ALKVQQKQRQ KHFNRQIPAA ASLIQTAWRC YAAENPDSST WKI YIRKAP RSHTLLSPSP KPKKSVVVKK KKFKLDKDNG VTPGEKMLTV PHITCDPPEE RRLDHFSVDG YDSSVRKSPT LLEV SMPHF MRTNSFAEDL DLEGETLLTP ITHISQLREH HRATIKVIRR MQYFVAKKKF QQARKPYDVR DVIEQYSQGH LNLMV RIKE LQRRLDQSIG KPSLFISVSE KSKDRGSNTI GARLNRVEDK VTQLDQRLAL ITDMLHQLLS LHSNSLEVLF QGP UniProtKB: Potassium voltage-gated channel subfamily KQT member 1 |
-分子 #2: Calmodulin-1
分子 | 名称: Calmodulin-1 / タイプ: protein_or_peptide / ID: 2 / コピー数: 4 / 光学異性体: LEVO |
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由来(天然) | 生物種: ![]() |
分子量 | 理論値: 16.852545 KDa |
組換発現 | 生物種: ![]() |
配列 | 文字列: MADQLTEEQI AEFKEAFSLF DKDGDGTITT KELGTVMRSL GQNPTEAELQ DMINEVDADG NGTIDFPEFL TMMARKMKDT DSEEEIREA FRVFDKDGNG YISAAELRHV MTNLGEKLTD EEVDEMIREA DIDGDGQVNY EEFVQMMTAK UniProtKB: Calmodulin-1 |
-分子 #3: MCherry fluorescent protein,Potassium voltage-gated channel subfa...
分子 | 名称: MCherry fluorescent protein,Potassium voltage-gated channel subfamily E member 3 タイプ: protein_or_peptide / ID: 3 / コピー数: 4 / 光学異性体: LEVO |
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由来(天然) | 生物種: ![]() |
分子量 | 理論値: 40.095168 KDa |
組換発現 | 生物種: ![]() |
配列 | 文字列: GGMVSKGEED NMAIIKEFMR FKVHMEGSVN GHEFEIEGEG EGRPYEGTQT AKLKVTKGGP LPFAWDILSP QFMYGSKAYV KHPADIPDY LKLSFPEGFN WERVMNFEDG GVVTVTQDSS LQDGEFIYKV KLRGTNFPSD GPVMQCRTMG WEASTERMYP E DGALKGEI ...文字列: GGMVSKGEED NMAIIKEFMR FKVHMEGSVN GHEFEIEGEG EGRPYEGTQT AKLKVTKGGP LPFAWDILSP QFMYGSKAYV KHPADIPDY LKLSFPEGFN WERVMNFEDG GVVTVTQDSS LQDGEFIYKV KLRGTNFPSD GPVMQCRTMG WEASTERMYP E DGALKGEI KQRLKLKDGG HYDAEVKTTY KAKKPVQLPG AYNVDIKLDI LSHNEDYTIV EQYERAEGRH STGGMDELYK GS GENLYFQ SSRATMETTN GTETWYESLH AVLKALNATL HSNLLCRPGP GLGPDNQTEE RRASLPGRDD NSYMYILFVM FLF AVTVGS LILGYTRSRK VDKRSDPYHV YIKNRVSMI UniProtKB: MCherry fluorescent protein, Potassium voltage-gated channel subfamily E member 3 |
-分子 #4: CALCIUM ION
分子 | 名称: CALCIUM ION / タイプ: ligand / ID: 4 / コピー数: 8 / 式: CA |
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分子量 | 理論値: 40.078 Da |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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![]() | 単粒子再構成法 |
試料の集合状態 | particle |
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試料調製
緩衝液 | pH: 7.4 |
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凍結 | 凍結剤: ETHANE |
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電子顕微鏡法
顕微鏡 | FEI TITAN KRIOS |
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撮影 | フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 平均電子線量: 94.0 e/Å2 |
電子線 | 加速電圧: 300 kV / 電子線源: ![]() |
電子光学系 | 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD |
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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画像解析
-原子モデル構築 1
精密化 | プロトコル: AB INITIO MODEL |
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得られたモデル | ![]() PDB-6v00: |