+データを開く
-基本情報
登録情報 | データベース: EMDB / ID: EMD-23245 | |||||||||
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タイトル | Integrin AlphaIIbBeta3-PT25-2 Complex | |||||||||
マップデータ | Cryo-EM map of Human aIIBb3 integrin headpiece with PT25-2 antibody fragment bound | |||||||||
試料 |
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キーワード | PT25-2 / CELL ADHESION | |||||||||
機能・相同性 | 機能・相同性情報 tube development / regulation of serotonin uptake / positive regulation of adenylate cyclase-inhibiting opioid receptor signaling pathway / alpha9-beta1 integrin-ADAM8 complex / regulation of trophoblast cell migration / integrin alphaIIb-beta3 complex / regulation of postsynaptic neurotransmitter receptor diffusion trapping / alphav-beta3 integrin-vitronectin complex / regulation of extracellular matrix organization / platelet alpha granule membrane ...tube development / regulation of serotonin uptake / positive regulation of adenylate cyclase-inhibiting opioid receptor signaling pathway / alpha9-beta1 integrin-ADAM8 complex / regulation of trophoblast cell migration / integrin alphaIIb-beta3 complex / regulation of postsynaptic neurotransmitter receptor diffusion trapping / alphav-beta3 integrin-vitronectin complex / regulation of extracellular matrix organization / platelet alpha granule membrane / positive regulation of glomerular mesangial cell proliferation / negative regulation of lipoprotein metabolic process / integrin alphav-beta3 complex / negative regulation of low-density lipoprotein receptor activity / fibrinogen binding / alphav-beta3 integrin-PKCalpha complex / maintenance of postsynaptic specialization structure / alphav-beta3 integrin-HMGB1 complex / blood coagulation, fibrin clot formation / mesodermal cell differentiation / vascular endothelial growth factor receptor 2 binding / negative regulation of lipid transport / glycinergic synapse / angiogenesis involved in wound healing / Elastic fibre formation / regulation of release of sequestered calcium ion into cytosol / alphav-beta3 integrin-IGF-1-IGF1R complex / cell-substrate junction assembly / platelet-derived growth factor receptor binding / filopodium membrane / extracellular matrix binding / positive regulation of vascular endothelial growth factor receptor signaling pathway / positive regulation of fibroblast migration / regulation of postsynaptic neurotransmitter receptor internalization / apolipoprotein A-I-mediated signaling pathway / regulation of bone resorption / apoptotic cell clearance / positive regulation of cell adhesion mediated by integrin / wound healing, spreading of epidermal cells / heterotypic cell-cell adhesion / integrin complex / positive regulation of leukocyte migration / Molecules associated with elastic fibres / smooth muscle cell migration / cell adhesion mediated by integrin / positive regulation of cell-matrix adhesion / microvillus membrane / negative chemotaxis / Syndecan interactions / cellular response to insulin-like growth factor stimulus / activation of protein kinase activity / p130Cas linkage to MAPK signaling for integrins / cell-substrate adhesion / protein disulfide isomerase activity / positive regulation of smooth muscle cell migration / positive regulation of osteoblast proliferation / cellular response to platelet-derived growth factor stimulus / TGF-beta receptor signaling activates SMADs / PECAM1 interactions / GRB2:SOS provides linkage to MAPK signaling for Integrins / lamellipodium membrane / platelet-derived growth factor receptor signaling pathway / fibronectin binding / negative regulation of macrophage derived foam cell differentiation / negative regulation of lipid storage / ECM proteoglycans / positive regulation of bone resorption / positive regulation of T cell migration / Integrin cell surface interactions / negative regulation of endothelial cell apoptotic process / coreceptor activity / positive regulation of substrate adhesion-dependent cell spreading / cell adhesion molecule binding / positive regulation of endothelial cell proliferation / embryo implantation / Integrin signaling / positive regulation of endothelial cell migration / cell-matrix adhesion / substrate adhesion-dependent cell spreading / Signal transduction by L1 / integrin-mediated signaling pathway / response to activity / regulation of actin cytoskeleton organization / protein kinase C binding / positive regulation of smooth muscle cell proliferation / wound healing / Signaling by high-kinase activity BRAF mutants / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / MAP2K and MAPK activation / platelet activation / platelet aggregation / VEGFA-VEGFR2 Pathway / cell-cell adhesion / ruffle membrane / cellular response to mechanical stimulus / positive regulation of angiogenesis / Signaling by RAF1 mutants / Signaling by moderate kinase activity BRAF mutants / Paradoxical activation of RAF signaling by kinase inactive BRAF / Signaling downstream of RAS mutants 類似検索 - 分子機能 | |||||||||
生物種 | Mus musculus (ハツカネズミ) / Homo sapiens (ヒト) | |||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.3 Å | |||||||||
データ登録者 | Bush MW / Walz T | |||||||||
資金援助 | 米国, 1件
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引用 | ジャーナル: Blood Adv / 年: 2021 タイトル: Electron microscopy shows that binding of monoclonal antibody PT25-2 primes integrin αIIbβ3 for ligand binding. 著者: Dragana Nešić / Martin Bush / Aleksandar Spasic / Jihong Li / Tetsuji Kamata / Makoto Handa / Marta Filizola / Thomas Walz / Barry S Coller / 要旨: The murine monoclonal antibody (mAb) PT25-2 induces αIIbβ3 to bind ligand and initiate platelet aggregation. The underlying mechanism is unclear, because previous mutagenesis studies suggested that ...The murine monoclonal antibody (mAb) PT25-2 induces αIIbβ3 to bind ligand and initiate platelet aggregation. The underlying mechanism is unclear, because previous mutagenesis studies suggested that PT25-2 binds to the αIIb β propeller, a site distant from the Arg-Gly-Asp-binding pocket. To elucidate the mechanism, we studied the αIIbβ3-PT25-2 Fab complex by negative-stain and cryo-electron microscopy (EM). We found that PT25-2 binding results in αIIbβ3 partially exposing multiple ligand-induced binding site epitopes and adopting extended conformations without swing-out of the β3 hybrid domain. The cryo-EM structure showed PT25-2 binding to the αIIb residues identified by mutagenesis but also to 2 additional regions. Overlay of the cryo-EM structure with the bent αIIbβ3 crystal structure showed that binding of PT25-2 creates clashes with the αIIb calf-1/calf-2 domains, suggesting that PT25-2 selectively binds to partially or fully extended receptor conformations and prevents a return to its bent conformation. Kinetic studies of the binding of PT25-2 compared with mAbs 10E5 and 7E3 support this hypothesis. We conclude that PT25-2 induces αIIbβ3 ligand binding by binding to extended conformations and by preventing the interactions between the αIIb and β3 leg domains and subsequently the βI and β3 leg domains required for the bent-closed conformation. | |||||||||
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 | EMマップ: SurfViewMolmilJmol/JSmol |
添付画像 |
-ダウンロードとリンク
-EMDBアーカイブ
マップデータ | emd_23245.map.gz | 117.2 MB | EMDBマップデータ形式 | |
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ヘッダ (付随情報) | emd-23245-v30.xml emd-23245.xml | 17.5 KB 17.5 KB | 表示 表示 | EMDBヘッダ |
画像 | emd_23245.png | 173.2 KB | ||
Filedesc metadata | emd-23245.cif.gz | 7.2 KB | ||
アーカイブディレクトリ | http://ftp.pdbj.org/pub/emdb/structures/EMD-23245 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-23245 | HTTPS FTP |
-検証レポート
文書・要旨 | emd_23245_validation.pdf.gz | 522.6 KB | 表示 | EMDB検証レポート |
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文書・詳細版 | emd_23245_full_validation.pdf.gz | 522.2 KB | 表示 | |
XML形式データ | emd_23245_validation.xml.gz | 5.3 KB | 表示 | |
CIF形式データ | emd_23245_validation.cif.gz | 6.4 KB | 表示 | |
アーカイブディレクトリ | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-23245 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-23245 | HTTPS FTP |
-関連構造データ
-リンク
EMDBのページ | EMDB (EBI/PDBe) / EMDataResource |
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「今月の分子」の関連する項目 |
-マップ
ファイル | ダウンロード / ファイル: emd_23245.map.gz / 形式: CCP4 / 大きさ: 125 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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注釈 | Cryo-EM map of Human aIIBb3 integrin headpiece with PT25-2 antibody fragment bound | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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: 1 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
CCP4マップ ヘッダ情報:
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-添付データ
-試料の構成要素
+全体 : Human aIIBb3 integrin headpiece with PT25-2 antibody fragment bound
+超分子 #1: Human aIIBb3 integrin headpiece with PT25-2 antibody fragment bound
+超分子 #2: PT25-2 heavy and light chains
+超分子 #3: aIIBb3 integrin headpiece
+分子 #1: PT25-2 heavy chain
+分子 #2: PT25-2 light chain
+分子 #3: Integrin alpha-IIb
+分子 #4: Integrin beta-3
+分子 #8: CALCIUM ION
+分子 #9: 2-acetamido-2-deoxy-beta-D-glucopyranose
+分子 #10: MAGNESIUM ION
+分子 #11: water
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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解析 | 単粒子再構成法 |
試料の集合状態 | particle |
-試料調製
緩衝液 | pH: 7.4 |
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グリッド | モデル: Quantifoil R1.2/1.3 / 材質: COPPER / 支持フィルム - 材質: CARBON / 支持フィルム - トポロジー: HOLEY / 前処理 - タイプ: GLOW DISCHARGE / 前処理 - 時間: 60 sec. / 前処理 - 雰囲気: AIR |
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 IV |
-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) 検出モード: SUPER-RESOLUTION / 平均電子線量: 80.0 e/Å2 |
電子線 | 加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN |
電子光学系 | 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD |
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 |
-画像解析
初期モデル | モデルのタイプ: PDB ENTRY |
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最終 再構成 | 解像度のタイプ: BY AUTHOR / 解像度: 3.3 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 使用した粒子像数: 166124 |
初期 角度割当 | タイプ: MAXIMUM LIKELIHOOD |
最終 角度割当 | タイプ: MAXIMUM LIKELIHOOD |