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基本情報
登録情報 | ![]() | |||||||||
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タイトル | Cryo-EM structure of the pancreatic ATP-sensitive potassium channel bound to ATP and glibenclamide with Kir6.2-CTD in the up conformation | |||||||||
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機能・相同性 | ![]() Regulation of insulin secretion / ATP sensitive Potassium channels / ABC-family proteins mediated transport / response to resveratrol / ATP-activated inward rectifier potassium channel activity / inward rectifying potassium channel / cell body fiber / sulfonylurea receptor activity / ventricular cardiac muscle tissue development / CAMKK-AMPK signaling cascade ...Regulation of insulin secretion / ATP sensitive Potassium channels / ABC-family proteins mediated transport / response to resveratrol / ATP-activated inward rectifier potassium channel activity / inward rectifying potassium channel / cell body fiber / sulfonylurea receptor activity / ventricular cardiac muscle tissue development / CAMKK-AMPK signaling cascade / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / inward rectifier potassium channel activity / ATPase-coupled monoatomic cation transmembrane transporter activity / regulation of monoatomic ion transmembrane transport / nervous system process / inorganic cation transmembrane transport / ankyrin binding / action potential / response to ATP / Ion homeostasis / response to testosterone / voltage-gated potassium channel activity / potassium channel activity / potassium ion import across plasma membrane / regulation of insulin secretion / intercalated disc / axolemma / negative regulation of insulin secretion / ABC-type transporter activity / potassium ion transmembrane transport / T-tubule / heat shock protein binding / acrosomal vesicle / response to ischemia / regulation of membrane potential / determination of adult lifespan / cellular response to glucose stimulus / positive regulation of protein localization to plasma membrane / potassium ion transport / sarcolemma / cellular response to nicotine / glucose metabolic process / response to estradiol / nuclear envelope / presynaptic membrane / cellular response to tumor necrosis factor / transmembrane transporter binding / response to hypoxia / endosome / response to xenobiotic stimulus / neuronal cell body / glutamatergic synapse / apoptotic process / ATP hydrolysis activity / ATP binding / plasma membrane 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: 3.58 Å | |||||||||
![]() | Shyng SL / Sung MW / Driggers CM | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Mechanism of pharmacochaperoning in a mammalian K channel revealed by cryo-EM. 著者: Gregory M Martin / Min Woo Sung / Zhongying Yang / Laura M Innes / Balamurugan Kandasamy / Larry L David / Craig Yoshioka / Show-Ling Shyng / ![]() 要旨: ATP-sensitive potassium (K) channels composed of a pore-forming Kir6.2 potassium channel and a regulatory ABC transporter sulfonylurea receptor 1 (SUR1) regulate insulin secretion in pancreatic β- ...ATP-sensitive potassium (K) channels composed of a pore-forming Kir6.2 potassium channel and a regulatory ABC transporter sulfonylurea receptor 1 (SUR1) regulate insulin secretion in pancreatic β-cells to maintain glucose homeostasis. Mutations that impair channel folding or assembly prevent cell surface expression and cause congenital hyperinsulinism. Structurally diverse K inhibitors are known to act as pharmacochaperones to correct mutant channel expression, but the mechanism is unknown. Here, we compare cryoEM structures of a mammalian K channel bound to pharmacochaperones glibenclamide, repaglinide, and carbamazepine. We found all three drugs bind within a common pocket in SUR1. Further, we found the N-terminus of Kir6.2 inserted within the central cavity of the SUR1 ABC core, adjacent the drug binding pocket. The findings reveal a common mechanism by which diverse compounds stabilize the Kir6.2 N-terminus within SUR1's ABC core, allowing it to act as a firm 'handle' for the assembly of metastable mutant SUR1-Kir6.2 complexes. | |||||||||
履歴 |
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マップデータ | ![]() | 4.3 MB | ![]() | |
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画像 | ![]() | 157.6 KB | ||
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-検証レポート
文書・要旨 | ![]() | 411.9 KB | 表示 | ![]() |
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文書・詳細版 | ![]() | 411.5 KB | 表示 | |
XML形式データ | ![]() | 4.4 KB | 表示 | |
CIF形式データ | ![]() | 4.9 KB | 表示 | |
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-関連構造データ
関連構造データ | ![]() 7u24MC ![]() 7tysC ![]() 7tytC ![]() 7u1eC ![]() 7u1qC ![]() 7u1sC ![]() 7u2xC ![]() 7u6yC ![]() 7u7mC ![]() 7uaaC ![]() 7uqrC M: このマップから作成された原子モデル 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 ![]() |
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EMDBのページ | ![]() ![]() |
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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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ボクセルのサイズ | X=Y=Z: 1.399 Å | ||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||
詳細 | EMDB XML:
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-添付データ
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試料の構成要素
+全体 : KATP-GBC-ATP-CTDup
+超分子 #1: KATP-GBC-ATP-CTDup
+超分子 #2: Kir6.2
+超分子 #3: SUR1
+分子 #1: ATP-sensitive inward rectifier potassium channel 11
+分子 #2: ATP-binding cassette sub-family C member 8
+分子 #3: ADENOSINE-5'-TRIPHOSPHATE
+分子 #4: PHOSPHATIDYLETHANOLAMINE
+分子 #5: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(tri...
+分子 #6: O-[(R)-{[(2R)-2,3-bis(octadecanoyloxy)propyl]oxy}(hydroxy)phospho...
+分子 #7: 5-chloro-N-(2-{4-[(cyclohexylcarbamoyl)sulfamoyl]phenyl}ethyl)-2-...
+分子 #8: 2-acetamido-2-deoxy-beta-D-glucopyranose
-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: 7.5 |
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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: 40.0 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 / Cs: 2.7 mm / 最大 デフォーカス(公称値): 2.6 µm / 最小 デフォーカス(公称値): 1.0 µm |
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |