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基本情報
登録情報 | データベース: PDB / ID: 7mit | ||||||
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タイトル | Vascular KATP channel: Kir6.1 SUR2B propeller-like conformation 1 | ||||||
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![]() | TRANSPORT PROTEIN / KATP / potassium channel / vascular | ||||||
機能・相同性 | ![]() cardiac pacemaker cell differentiation / atrioventricular node cell differentiation / vascular process in circulatory system / substrate-dependent cell migration, cell contraction / reactive oxygen species biosynthetic process / oxygen metabolic process / ATP sensitive Potassium channels / reactive gliosis / response to decreased oxygen levels / potassium channel activator activity ...cardiac pacemaker cell differentiation / atrioventricular node cell differentiation / vascular process in circulatory system / substrate-dependent cell migration, cell contraction / reactive oxygen species biosynthetic process / oxygen metabolic process / ATP sensitive Potassium channels / reactive gliosis / response to decreased oxygen levels / potassium channel activator activity / ABC-family proteins mediated transport / response to peptide / response to resveratrol / ATP-activated inward rectifier potassium channel activity / glutamate secretion, neurotransmission / membrane repolarization during ventricular cardiac muscle cell action potential / inward rectifying potassium channel / sulfonylurea receptor activity / ventricular cardiac muscle tissue development / voltage-gated potassium channel activity involved in ventricular cardiac muscle cell action potential repolarization / NLRP3 inflammasome complex assembly / response to potassium ion / CAMKK-AMPK signaling cascade / circulatory system development / cardiac conduction / response to oxygen levels / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / cellular response to potassium ion / response to hydrogen sulfide / cellular response to chemical stress / cellular respiration / ATPase-coupled monoatomic cation transmembrane transporter activity / regulation of monoatomic ion transmembrane transport / coronary vasculature development / vasculature development / cardiac muscle cell contraction / synaptic assembly at neuromuscular junction / regulation of potassium ion transmembrane transport / syntaxin binding / nervous system process / inorganic cation transmembrane transport / blood circulation / Ion homeostasis / cellular response to ATP / neuromuscular process / sulfonylurea receptor binding / response to ATP / heterocyclic compound binding / response to stress / establishment of cell polarity / blood vessel development / transmission of nerve impulse / p38MAPK cascade / fat cell differentiation / response to exogenous dsRNA / potassium ion import across plasma membrane / myofibril / monoatomic cation transmembrane transport / fatty acid oxidation / action potential / protein secretion / potassium channel activity / ATPase-coupled transmembrane transporter activity / ABC-type transporter activity / potassium channel regulator activity / fatty acid transport / ATP metabolic process / heart morphogenesis / skeletal muscle tissue development / presynaptic active zone membrane / negative regulation of blood pressure / potassium ion transmembrane transport / T-tubule / response to cytokine / regulation of heart rate / cellular response to calcium ion / response to endoplasmic reticulum stress / acrosomal vesicle / blood vessel diameter maintenance / sarcomere / response to ischemia / regulation of membrane potential / response to activity / kidney development / determination of adult lifespan / mitochondrion organization / response to insulin / microglial cell activation / potassium ion transport / sarcolemma / calcium ion transmembrane transport / response to hydrogen peroxide / transmembrane transport / regulation of blood pressure / response to estrogen / vasodilation / MAPK cascade / cellular response to xenobiotic stimulus / presynapse / heart development 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: 3.4 Å | ||||||
![]() | Sung, M.W. / Shyng, S.L. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Vascular K channel structural dynamics reveal regulatory mechanism by Mg-nucleotides. 著者: Min Woo Sung / Zhongying Yang / Camden M Driggers / Bruce L Patton / Barmak Mostofian / John D Russo / Daniel M Zuckerman / Show-Ling Shyng / ![]() 要旨: Vascular tone is dependent on smooth muscle K channels comprising pore-forming Kir6.1 and regulatory SUR2B subunits, in which mutations cause Cantú syndrome. Unique among K isoforms, they lack ...Vascular tone is dependent on smooth muscle K channels comprising pore-forming Kir6.1 and regulatory SUR2B subunits, in which mutations cause Cantú syndrome. Unique among K isoforms, they lack spontaneous activity and require Mg-nucleotides for activation. Structural mechanisms underlying these properties are unknown. Here, we determined cryogenic electron microscopy structures of vascular K channels bound to inhibitory ATP and glibenclamide, which differ informatively from similarly determined pancreatic K channel isoform (Kir6.2/SUR1). Unlike SUR1, SUR2B subunits adopt distinct rotational "propeller" and "quatrefoil" geometries surrounding their Kir6.1 core. The glutamate/aspartate-rich linker connecting the two halves of the SUR-ABC core is observed in a quatrefoil-like conformation. Molecular dynamics simulations reveal MgADP-dependent dynamic tripartite interactions between this linker, SUR2B, and Kir6.1. The structures captured implicate a progression of intermediate states between MgADP-free inactivated, and MgADP-bound activated conformations wherein the glutamate/aspartate-rich linker participates as mobile autoinhibitory domain, suggesting a conformational pathway toward K channel activation. | ||||||
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構造ビューア | 分子: ![]() ![]() |
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集合体
登録構造単位 | ![]()
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要素
-タンパク質 , 2種, 5分子 ABCDE
#1: タンパク質 | 分子量: 48023.871 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: 174488.562 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() |
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-糖 , 1種, 1分子
#3: 多糖 | 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose |
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-非ポリマー , 6種, 32分子 










#4: 化合物 | ChemComp-K / #5: 化合物 | ChemComp-ATP / #6: 化合物 | ChemComp-POV / ( #7: 化合物 | ChemComp-PTY / #8: 化合物 | ChemComp-P5S / #9: 化合物 | ChemComp-GBM / | |
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-詳細
研究の焦点であるリガンドがあるか | Y |
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Has protein modification | Y |
-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: vascular KATP channel: Kir6.1 SUR2B propeller-like conformation 1 タイプ: COMPLEX / Entity ID: #1-#2 / 由来: RECOMBINANT |
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分子量 | 値: 0.889 MDa / 実験値: YES |
由来(天然) | 生物種: ![]() ![]() |
由来(組換発現) | 生物種: ![]() |
緩衝液 | pH: 7.5 |
試料 | 濃度: 0.25 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | 詳細: unspecified |
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: 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: 40 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: NONE | ||||||||||||||||
3次元再構成 | 解像度: 3.4 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 139944 / 対称性のタイプ: POINT | ||||||||||||||||
原子モデル構築 | プロトコル: AB INITIO MODEL | ||||||||||||||||
原子モデル構築 | PDB-ID: 6BAA Accession code: 6BAA / Source name: PDB / タイプ: experimental model |