+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 8ti1 | |||||||||
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タイトル | Cryo-EM structure of a SUR1/Kir6.2-Q52R ATP-sensitive potassium channel in the presence of PIP2 in the open conformation | |||||||||
要素 |
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キーワード | TRANSPORT PROTEIN / ATP-sensitive potassium channel / KATP channel / SUR1 / Kir6.2-Q52R / potassium transport / metabolic sensor / diabetes / phospholipid binding / PIP2 | |||||||||
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 / 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 / response to estradiol / nuclear envelope / 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) Mesocricetus auratus (ネズミ) | |||||||||
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: 2.9 Å | |||||||||
データ登録者 | Driggers, C.M. / Shyng, S.-L. | |||||||||
資金援助 | 米国, 2件
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引用 | ジャーナル: Nat Commun / 年: 2024 タイトル: Structure of an open K channel reveals tandem PIP binding sites mediating the Kir6.2 and SUR1 regulatory interface. 著者: Camden M Driggers / Yi-Ying Kuo / Phillip Zhu / Assmaa ElSheikh / Show-Ling Shyng / 要旨: ATP-sensitive potassium (K) channels, composed of four pore-lining Kir6.2 subunits and four regulatory sulfonylurea receptor 1 (SUR1) subunits, control insulin secretion in pancreatic β-cells. K ...ATP-sensitive potassium (K) channels, composed of four pore-lining Kir6.2 subunits and four regulatory sulfonylurea receptor 1 (SUR1) subunits, control insulin secretion in pancreatic β-cells. K channel opening is stimulated by PIP and inhibited by ATP. Mutations that increase channel opening by PIP reduce ATP inhibition and cause neonatal diabetes. Although considerable evidence has implicated a role for PIP in K channel function, previously solved open-channel structures have lacked bound PIP, and mechanisms by which PIP regulates K channels remain unresolved. Here, we report the cryoEM structure of a K channel harboring the neonatal diabetes mutation Kir6.2-Q52R, in the open conformation, bound to amphipathic molecules consistent with natural C18:0/C20:4 long-chain PI(4,5)P at two adjacent binding sites between SUR1 and Kir6.2. The canonical PIP binding site is conserved among PIP-gated Kir channels. The non-canonical PIP binding site forms at the interface of Kir6.2 and SUR1. Functional studies demonstrate both binding sites determine channel activity. Kir6.2 pore opening is associated with a twist of the Kir6.2 cytoplasmic domain and a rotation of the N-terminal transmembrane domain of SUR1, which widens the inhibitory ATP binding pocket to disfavor ATP binding. The open conformation is particularly stabilized by the Kir6.2-Q52R residue through cation-π bonding with SUR1-W51. Together, these results uncover the cooperation between SUR1 and Kir6.2 in PIP binding and gating, explain the antagonistic regulation of K channels by PIP and ATP, and provide a putative mechanism by which Kir6.2-Q52R stabilizes an open channel to cause neonatal diabetes. | |||||||||
履歴 |
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-構造の表示
構造ビューア | 分子: MolmilJmol/JSmol |
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-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 8ti1.cif.gz | 1.1 MB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb8ti1.ent.gz | 913 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 8ti1.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 | 8ti1_validation.pdf.gz | 2.4 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 8ti1_full_validation.pdf.gz | 2.4 MB | 表示 | |
XML形式データ | 8ti1_validation.xml.gz | 174.8 KB | 表示 | |
CIF形式データ | 8ti1_validation.cif.gz | 249.3 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/ti/8ti1 ftp://data.pdbj.org/pub/pdb/validation_reports/ti/8ti1 | 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
-タンパク質 , 2種, 8分子 ABCDEHGF
#1: タンパク質 | 分子量: 43690.828 Da / 分子数: 4 / 変異: Q52R / 由来タイプ: 組換発現 / 由来: (組換発現) Rattus norvegicus (ドブネズミ) / Cell: Beta cell / 遺伝子: Kcnj11 / 器官: Pancreas / 細胞株 (発現宿主): COS-M6 (RRID:CVCL_8561) / 発現宿主: Chlorocebus aethiops (ミドリザル) / 参照: UniProt: P70673 #2: タンパク質 | 分子量: 177296.578 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) Mesocricetus auratus (ネズミ) / 細胞株 (発現宿主): COS-M6 (RRID:CVCL_8561) / 発現宿主: Chlorocebus aethiops (ミドリザル) / 参照: UniProt: A0A1S4NYG1 |
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-糖 , 1種, 4分子
#7: 糖 | ChemComp-NAG / |
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-非ポリマー , 5種, 38分子
#3: 化合物 | ChemComp-PT5 / [( #4: 化合物 | ChemComp-K / #5: 化合物 | ChemComp-PEF / #6: 化合物 | ChemComp-P5S / #8: 水 | ChemComp-HOH / | |
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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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-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 | 名称: Kir6.2-Q52R/SUR1 open channel / タイプ: COMPLEX 詳細: Kir6.2-Q52R/SUR1 open KATP channel in the open conformation in complex with PIP2 and other phospholipids Entity ID: #1-#2 / 由来: MULTIPLE SOURCES | ||||||||||||||||||||||||||||||
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分子量 | 値: 0.880 MDa / 実験値: NO | ||||||||||||||||||||||||||||||
由来(天然) | 生物種: Rattus norvegicus (ドブネズミ) | ||||||||||||||||||||||||||||||
由来(組換発現) | 生物種: Chlorocebus aethiops (ミドリザル) / 細胞: COS-M6 cells / プラスミド: recombinant adenovirus | ||||||||||||||||||||||||||||||
緩衝液 | pH: 7.4 / 詳細: MSB with digitonin and PIP2 | ||||||||||||||||||||||||||||||
緩衝液成分 |
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試料 | 濃度: 0.15 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: 3 microliters of purified Kir6.2-Q52R/FLAG-SUR1 was loaded onto Quantifoil R 1.2/1.3 Au 300 grids prepared with a fresh Graphene Oxide surface | ||||||||||||||||||||||||||||||
試料支持 | 詳細: The grid was prepared with a Graphene Oxide coating before use. グリッドの材料: GOLD / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 | ||||||||||||||||||||||||||||||
急速凍結 | 装置: FEI VITROBOT MARK III / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 279 K |
-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 詳細: Titan Krios #3 at the Pacific Northwest National Lab |
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): 105000 X / 最大 デフォーカス(公称値): 2500 nm / 最小 デフォーカス(公称値): 1000 nm / Cs: 2.7 mm / C2レンズ絞り径: 70 µm / アライメント法: COMA FREE |
試料ホルダ | 凍結剤: NITROGEN 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
撮影 | 平均露光時間: 2.2 sec. / 電子線照射量: 55 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 撮影したグリッド数: 3 / 実像数: 5241 |
-解析
EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 14115 | ||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C4 (4回回転対称) | ||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 2.9 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 14115 / クラス平均像の数: 1 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: FLEXIBLE FIT | ||||||||||||||||||||||||||||||||||||
原子モデル構築 | PDB-ID: 6BAA Accession code: 6BAA / Source name: PDB / タイプ: experimental model | ||||||||||||||||||||||||||||||||||||
拘束条件 |
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