+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 5twv | |||||||||
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タイトル | Cryo-EM structure of the pancreatic ATP-sensitive K+ channel SUR1/Kir6.2 in the presence of ATP and glibenclamide | |||||||||
要素 |
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キーワード | TRANSPORT PROTEIN / katp / kir6.2 / sur1 / potassium channel | |||||||||
機能・相同性 | 機能・相同性情報 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 / sulfonylurea receptor activity / cell body fiber / 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 / sulfonylurea receptor activity / cell body fiber / ventricular cardiac muscle tissue development / CAMKK-AMPK signaling cascade / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / ATPase-coupled monoatomic cation transmembrane transporter activity / inward rectifier potassium channel activity / regulation of monoatomic ion transmembrane transport / nervous system process / inorganic cation transmembrane transport / response to stress / ankyrin binding / Ion homeostasis / response to ATP / action potential / potassium ion import across plasma membrane / response to testosterone / voltage-gated potassium channel activity / intercalated disc / potassium channel activity / axolemma / ABC-type transporter activity / negative regulation of insulin secretion / cellular response to nutrient levels / heat shock protein binding / T-tubule / potassium ion transmembrane transport / regulation of insulin secretion / acrosomal vesicle / regulation of membrane potential / determination of adult lifespan / response to ischemia / positive regulation of protein localization to plasma membrane / cellular response to glucose stimulus / potassium ion transport / sarcolemma / cellular response to nicotine / glucose metabolic process / cellular response to tumor necrosis factor / nuclear envelope / response to estradiol / presynaptic membrane / transmembrane transporter binding / response to hypoxia / endosome / response to xenobiotic stimulus / neuronal cell body / glutamatergic synapse / apoptotic process / ATP hydrolysis activity / protein-containing complex / ATP binding / plasma membrane / cytoplasm 類似検索 - 分子機能 | |||||||||
生物種 | Rattus norvegicus (ドブネズミ) Cricetus cricetus (クロハラハムスクー) | |||||||||
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: 6.3 Å | |||||||||
データ登録者 | Martin, G.M. / Yoshioka, C. / Chen, J.Z. / Shyng, S.L. | |||||||||
資金援助 | 米国, 2件
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引用 | ジャーナル: Elife / 年: 2017 タイトル: Cryo-EM structure of the ATP-sensitive potassium channel illuminates mechanisms of assembly and gating. 著者: Gregory M Martin / Craig Yoshioka / Emily A Rex / Jonathan F Fay / Qing Xie / Matthew R Whorton / James Z Chen / Show-Ling Shyng / 要旨: K channels are metabolic sensors that couple cell energetics to membrane excitability. In pancreatic β-cells, channels formed by SUR1 and Kir6.2 regulate insulin secretion and are the targets of ...K channels are metabolic sensors that couple cell energetics to membrane excitability. In pancreatic β-cells, channels formed by SUR1 and Kir6.2 regulate insulin secretion and are the targets of antidiabetic sulfonylureas. Here, we used cryo-EM to elucidate structural basis of channel assembly and gating. The structure, determined in the presence of ATP and the sulfonylurea glibenclamide, at ~6 Å resolution reveals a closed Kir6.2 tetrameric core with four peripheral SUR1s each anchored to a Kir6.2 by its N-terminal transmembrane domain (TMD0). Intricate interactions between TMD0, the loop following TMD0, and Kir6.2 near the proposed PIP binding site, and where ATP density is observed, suggest SUR1 may contribute to ATP and PIP binding to enhance Kir6.2 sensitivity to both. The SUR1-ABC core is found in an unusual inward-facing conformation whereby the two nucleotide binding domains are misaligned along a two-fold symmetry axis, revealing a possible mechanism by which glibenclamide inhibits channel activity. | |||||||||
履歴 |
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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: MolmilJmol/JSmol |
-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 5twv.cif.gz | 1 MB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb5twv.ent.gz | 794.3 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 5twv.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 | 5twv_validation.pdf.gz | 1.3 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 5twv_full_validation.pdf.gz | 1.4 MB | 表示 | |
XML形式データ | 5twv_validation.xml.gz | 158.4 KB | 表示 | |
CIF形式データ | 5twv_validation.cif.gz | 251.7 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/tw/5twv ftp://data.pdbj.org/pub/pdb/validation_reports/tw/5twv | HTTPS FTP |
-関連構造データ
-リンク
-集合体
登録構造単位 |
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1 |
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-要素
#1: タンパク質 | 分子量: 43645.719 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) Rattus norvegicus (ドブネズミ) / 遺伝子: Kcnj11 / 細胞株 (発現宿主): INS-1 / 発現宿主: Rattus norvegicus (ドブネズミ) / 参照: UniProt: P70673*PLUS #2: タンパク質 | 分子量: 178330.516 Da / 分子数: 4 / 由来タイプ: 組換発現 由来: (組換発現) Cricetus cricetus (クロハラハムスクー) 遺伝子: ABCC8, SUR / 細胞株 (発現宿主): INS-1 / 発現宿主: Rattus norvegicus (ドブネズミ) / 参照: UniProt: Q09427 #3: 化合物 | ChemComp-ATP / Has protein modification | Y | 配列の詳細 | Kir6.2: GenBank reference BAA96239.1 | |
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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 |
-試料調製
構成要素 |
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由来(天然) |
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由来(組換発現) |
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緩衝液 | pH: 7.5 | ||||||||||||||||||||||||
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 |
-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 / 倍率(公称値): 81000 X / 最大 デフォーカス(公称値): 3000 nm / 最小 デフォーカス(公称値): 1500 nm |
撮影 | 電子線照射量: 40 e/Å2 / 検出モード: COUNTING フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) |
-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: 6.3 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 20000 / 対称性のタイプ: POINT |