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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 desensitised ATP-bound human P2X1 receptor | |||||||||
![]() | Map of the P2X1 receptor generated in Cryosparc. (J609 homogenous refinement job) | |||||||||
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![]() | Ion channel / trimer / ATP-bound / desensitised / MEMBRANE PROTEIN | |||||||||
機能・相同性 | ![]() regulation of vascular associated smooth muscle contraction / Platelet homeostasis / insemination / positive regulation of calcium ion import across plasma membrane / extracellularly ATP-gated monoatomic cation channel activity / purinergic nucleotide receptor activity / suramin binding / serotonin secretion by platelet / ligand-gated calcium channel activity / Elevation of cytosolic Ca2+ levels ...regulation of vascular associated smooth muscle contraction / Platelet homeostasis / insemination / positive regulation of calcium ion import across plasma membrane / extracellularly ATP-gated monoatomic cation channel activity / purinergic nucleotide receptor activity / suramin binding / serotonin secretion by platelet / ligand-gated calcium channel activity / Elevation of cytosolic Ca2+ levels / regulation of presynaptic cytosolic calcium ion concentration / ceramide biosynthetic process / response to ATP / regulation of synaptic vesicle exocytosis / neuronal action potential / specific granule membrane / monoatomic cation channel activity / monoatomic ion transport / presynaptic active zone membrane / secretory granule membrane / synaptic transmission, glutamatergic / calcium ion transmembrane transport / platelet activation / regulation of blood pressure / postsynaptic membrane / membrane raft / external side of plasma membrane / apoptotic process / Neutrophil degranulation / protein-containing complex binding / glutamatergic synapse / signal transduction / protein-containing complex / ATP binding / identical protein 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: 1.96 Å | |||||||||
![]() | Felix MB / Alisa G / Hariprasad V / Jesse IM / David MT | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Structural insights into the human P2X1 receptor and ligand interactions. 著者: Felix M Bennetts / Hariprasad Venugopal / Alisa Glukhova / Jesse I Mobbs / Sabatino Ventura / David M Thal / ![]() 要旨: The P2X1 receptor is a trimeric ligand-gated ion channel that plays an important role in urogenital and immune functions, offering the potential for new drug treatments. However, progress in this ...The P2X1 receptor is a trimeric ligand-gated ion channel that plays an important role in urogenital and immune functions, offering the potential for new drug treatments. However, progress in this area has been hindered by limited structural information and a lack of well-characterised tool compounds. In this study, we employ cryogenic electron microscopy (cryo-EM) to elucidate the structures of the P2X1 receptor in an ATP-bound desensitised state and an NF449-bound closed state. NF449, a potent P2X1 receptor antagonist, engages the receptor distinctively, while ATP, the endogenous ligand, binds in a manner consistent with other P2X receptors. To explore the molecular basis of receptor inhibition, activation, and ligand interactions, key residues involved in ligand and metal ion binding were mutated. Radioligand binding assays with [H]-α,β-methylene ATP and intracellular calcium ion influx assays were used to evaluate the effects of these mutations. These experiments validate key ligand-receptor interactions and identify conserved and non-conserved residues critical for ligand binding or receptor modulation. This research expands our understanding of the P2X1 receptor structure at a molecular level and opens new avenues for in silico drug design targeting the P2X1 receptor. | |||||||||
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構造の表示
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-EMDBアーカイブ
マップデータ | ![]() | 26.4 MB | ![]() | |
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ヘッダ (付随情報) | ![]() ![]() | 24.9 KB 24.9 KB | 表示 表示 | ![]() |
FSC (解像度算出) | ![]() | 7.8 KB | 表示 | ![]() |
画像 | ![]() | 65.4 KB | ||
マスクデータ | ![]() | 52.7 MB | ![]() | |
Filedesc metadata | ![]() | 7.5 KB | ||
その他 | ![]() ![]() ![]() | 49.3 MB 48.9 MB 48.9 MB | ||
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
関連構造データ | ![]() 9b73MC ![]() 9b95C 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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リンク
EMDBのページ | ![]() ![]() |
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マップ
ファイル | ![]() | ||||||||||||||||||||||||||||||||||||
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注釈 | Map of the P2X1 receptor generated in Cryosparc. (J609 homogenous refinement job) | ||||||||||||||||||||||||||||||||||||
投影像・断面図 | 画像のコントロール
画像は Spider により作成 | ||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 0.82 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
-マスク #1
ファイル | ![]() | ||||||||||||
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投影像・断面図 |
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密度ヒストグラム |
-追加マップ: Sharp map of the P2X1 receptor generated in...
ファイル | emd_44299_additional_1.map | ||||||||||||
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注釈 | Sharp map of the P2X1 receptor generated in Phenix. (Generated from original cryo-EM map) | ||||||||||||
投影像・断面図 |
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密度ヒストグラム |
-ハーフマップ: Half map of the P2X1 receptor generated in...
ファイル | emd_44299_half_map_1.map | ||||||||||||
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注釈 | Half map of the P2X1 receptor generated in Cryosparc. (J609 homogenous refinement job) | ||||||||||||
投影像・断面図 |
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密度ヒストグラム |
-ハーフマップ: Half map of the P2X1 receptor generated in...
ファイル | emd_44299_half_map_2.map | ||||||||||||
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注釈 | Half map of the P2X1 receptor generated in Cryosparc. (J609 homogenous refinement job) | ||||||||||||
投影像・断面図 |
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密度ヒストグラム |
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試料の構成要素
-全体 : P2X1 receptor trimer
全体 | 名称: P2X1 receptor trimer |
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要素 |
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-超分子 #1: P2X1 receptor trimer
超分子 | 名称: P2X1 receptor trimer / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1 |
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由来(天然) | 生物種: ![]() |
分子量 | 理論値: 134.94 KDa |
-分子 #1: P2X purinoceptor 1
分子 | 名称: P2X purinoceptor 1 / タイプ: protein_or_peptide / ID: 1 / コピー数: 3 / 光学異性体: LEVO |
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由来(天然) | 生物種: ![]() |
分子量 | 理論値: 45.038957 KDa |
組換発現 | 生物種: ![]() ![]() |
配列 | 文字列: MARRFQEELA AFLFEYDTPR MVLVRNKKVG VIFRLIQLVV LVYVIGWVFL YEKGYQTSSG LISSVSVKLK GLAVTQLPGL GPQVWDVAD YVFPAQGDNS FVVMTNFIVT PKQTQGYCAE HPEGGICKED SGCTPGKAKR KAQGIRTGKC VAFNDTVKTC E IFGWCPVE ...文字列: MARRFQEELA AFLFEYDTPR MVLVRNKKVG VIFRLIQLVV LVYVIGWVFL YEKGYQTSSG LISSVSVKLK GLAVTQLPGL GPQVWDVAD YVFPAQGDNS FVVMTNFIVT PKQTQGYCAE HPEGGICKED SGCTPGKAKR KAQGIRTGKC VAFNDTVKTC E IFGWCPVE VDDDIPRPAL LREAENFTLF IKNSISFPRF KVNRRNLVEE VNAAHMKTCL FHKTLHPLCP VFQLGYVVQE SG QNFSTLA EKGGVVGITI DWHCDLDWHV RHCRPIYEFH GLYEEKNLSP GFNFRFARHF VENGTNYRHL FKVFGIRFDI LVD GKAGKF DIIPTMTTIG SGIGIFGVAT VLCDLLLLHI LPKRHYYKQK KFKYAEDMGP GAAERDLAAT SSTLGLQENM RTS UniProtKB: P2X purinoceptor 1 |
-分子 #2: ADENOSINE-5'-TRIPHOSPHATE
分子 | 名称: ADENOSINE-5'-TRIPHOSPHATE / タイプ: ligand / ID: 2 / コピー数: 3 / 式: ATP |
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分子量 | 理論値: 507.181 Da |
Chemical component information | ![]() ChemComp-ATP: |
-分子 #3: 2-acetamido-2-deoxy-beta-D-glucopyranose
分子 | 名称: 2-acetamido-2-deoxy-beta-D-glucopyranose / タイプ: ligand / ID: 3 / コピー数: 9 / 式: NAG |
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分子量 | 理論値: 221.208 Da |
Chemical component information | ![]() ChemComp-NAG: |
-分子 #4: MAGNESIUM ION
分子 | 名称: MAGNESIUM ION / タイプ: ligand / ID: 4 / コピー数: 3 / 式: MG |
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分子量 | 理論値: 24.305 Da |
-分子 #5: water
分子 | 名称: water / タイプ: ligand / ID: 5 / コピー数: 66 / 式: HOH |
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分子量 | 理論値: 18.015 Da |
Chemical component information | ![]() ChemComp-HOH: |
-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
濃度 | 19 mg/mL | ||||||||||||||||||||||||
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緩衝液 | pH: 8 構成要素:
詳細: The buffer consists of 50 mM Tris (pH 8), 100 mM NaCl, 0.01% LMNG, and 0.0006% CHS supplemented with 1 mM ATP and 1 mM MgCl2 overnight before vitrification. Additionally, 0.4 mM or 1.2 mM of ...詳細: The buffer consists of 50 mM Tris (pH 8), 100 mM NaCl, 0.01% LMNG, and 0.0006% CHS supplemented with 1 mM ATP and 1 mM MgCl2 overnight before vitrification. Additionally, 0.4 mM or 1.2 mM of fluorinated Fos-Choline-8 (fluor-FC8) was added just one minute prior to vitrification. | ||||||||||||||||||||||||
グリッド | モデル: UltrAuFoil R1.2/1.3 / 材質: GOLD / メッシュ: 300 / 支持フィルム - 材質: GOLD / 支持フィルム - トポロジー: HOLEY ARRAY / 支持フィルム - Film thickness: 50 / 前処理 - タイプ: GLOW DISCHARGE / 前処理 - 時間: 180 sec. / 前処理 - 雰囲気: OTHER / 詳細: Model used: Glow Discharge Peelco Easyglow | ||||||||||||||||||||||||
凍結 | 凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 277 K / 装置: FEI VITROBOT MARK III 詳細: Grids were frozen in liquid ethane using a Vitrobot Mark III operated at 4 degrees Celsius and 100% humidity with 12 blot force and 2 seconds blot time.. |
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電子顕微鏡法
顕微鏡 | TFS KRIOS |
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詳細 | Initial grid screening was conducted using a 200kV TFS Artica cryo-electron microscope prior to imaging on a Titan Krios cryo-electron microscope. |
撮影 | 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: 2 / 実像数: 10756 / 平均露光時間: 1.0 sec. / 平均電子線量: 60.0 e/Å2 詳細: 4578 images were collected on the grid containing P2X1 receptor supplemented with a higher concentration of fluor-FC8 (1.2 mM), while 6178 images were collected on the grid with a lower ...詳細: 4578 images were collected on the grid containing P2X1 receptor supplemented with a higher concentration of fluor-FC8 (1.2 mM), while 6178 images were collected on the grid with a lower concentration of fluor-FC8 (0.4 mM) |
電子線 | 加速電圧: 300 kV / 電子線源: ![]() |
電子光学系 | 倍率(補正後): 105000 / 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): 1.5 µm / 最小 デフォーカス(公称値): 0.5 µm / 倍率(公称値): 105000 |
試料ステージ | 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER ホルダー冷却材: NITROGEN |
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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画像解析
-原子モデル構築 1
初期モデル | PDB ID: Chain - Residue range: 1-399 / Chain - Source name: AlphaFold / Chain - Initial model type: in silico model / 詳細: Full human P2X1 receptor trimer |
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詳細 | Initial fitting was performed in Chimerax and then refinements were performed in Coot and Phenix. |
精密化 | 空間: REAL / プロトコル: RIGID BODY FIT / 温度因子: 60.7 |
得られたモデル | ![]() PDB-9b73: |