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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 | ||||||
要素 |
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キーワード | TRANSPORT PROTEIN / KATP / potassium channel / vascular | ||||||
| 機能・相同性 | 機能・相同性情報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 / synaptic assembly at neuromuscular junction / ATP sensitive Potassium channels / reactive gliosis / response to decreased oxygen levels ...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 / synaptic assembly at neuromuscular junction / ATP sensitive Potassium channels / reactive gliosis / response to decreased oxygen levels / ABC-family proteins mediated transport / response to peptide / potassium channel activator activity / ATP-activated inward rectifier potassium channel activity / glutamate secretion, neurotransmission / response to resveratrol / inward rectifying potassium channel / membrane repolarization during ventricular cardiac muscle cell action potential / sulfonylurea receptor activity / ventricular cardiac muscle tissue development / voltage-gated potassium channel activity involved in ventricular cardiac muscle cell action potential repolarization / response to potassium ion / CAMKK-AMPK signaling cascade / cardiac conduction / NLRP3 inflammasome complex assembly / response to oxygen levels / response to hydrogen sulfide / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / regulation of monoatomic ion transmembrane transport / ATPase-coupled monoatomic cation transmembrane transporter activity / cellular respiration / coronary vasculature development / cellular response to chemical stress / vasculature development / cardiac muscle cell contraction / regulation of potassium ion transmembrane transport / cellular response to potassium ion / heterocyclic compound binding / circulatory system development / nervous system process / syntaxin binding / : / blood circulation / sulfonylurea receptor binding / Ion homeostasis / neuromuscular process / blood vessel development / response to ATP / p38MAPK cascade / response to exogenous dsRNA / fat cell differentiation / cellular response to ATP / establishment of cell polarity / myofibril / fatty acid oxidation / potassium ion import across plasma membrane / monoatomic cation transmembrane transport / response to stress / transmission of nerve impulse / protein secretion / action potential / ATPase-coupled transmembrane transporter activity / potassium channel regulator activity / potassium channel activity / ABC-type transporter activity / fatty acid transport / heart morphogenesis / skeletal muscle tissue development / ATP metabolic process / negative regulation of blood pressure / presynaptic active zone membrane / response to cytokine / potassium ion transmembrane transport / T-tubule / acrosomal vesicle / regulation of heart rate / cellular response to calcium ion / response to endoplasmic reticulum stress / blood vessel diameter maintenance / sarcomere / response to ischemia / response to activity / determination of adult lifespan / regulation of membrane potential / mitochondrion organization / kidney development / response to hydrogen peroxide / microglial cell activation / sarcolemma / response to insulin / potassium ion transport / calcium ion transmembrane transport / transmembrane transport / response to estrogen / regulation of blood pressure / vasodilation / cellular response to xenobiotic stimulus / MAPK cascade / 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 | ||||||
データ登録者 | Sung, M.W. / Shyng, S.L. | ||||||
| 資金援助 | 米国, 1件
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引用 | ジャーナル: Proc Natl Acad Sci U S A / 年: 2021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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構造の表示
| ムービー |
ムービービューア |
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| 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 | 7mit.cif.gz | 512.2 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb7mit.ent.gz | 表示 | PDB形式 | |
| PDBx/mmJSON形式 | 7mit.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
| アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/mi/7mit ftp://data.pdbj.org/pub/pdb/validation_reports/mi/7mit | HTTPS FTP |
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-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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| 1 |
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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) ![]() Chlorocebus aethiops (ミドリザル) / 参照: UniProt: Q63664#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) ![]() Chlorocebus aethiops (ミドリザル) / 参照: UniProt: Q63563 |
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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: Chlorocebus aethiops (ミドリザル) |
| 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: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: SPOT SCAN |
| 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
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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 |
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万見について






米国, 1件
引用
UCSF Chimera












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