登録情報 データベース : EMDB / ID : EMD-23245 構造の表示 ダウンロードとリンクタイトル 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 詳細 試料細胞 : Human aIIBb3 integrin headpiece with PT25-2 antibody fragment bound細胞 : PT25-2 heavy and light chainsタンパク質・ペプチド : PT25-2 heavy chainタンパク質・ペプチド : PT25-2 light chain細胞 : aIIBb3 integrin headpieceタンパク質・ペプチド : Integrin alpha-IIbタンパク質・ペプチド : Integrin beta-3リガンド : CALCIUM IONリガンド : 2-acetamido-2-deoxy-beta-D-glucopyranoseリガンド : MAGNESIUM IONリガンド : water 詳細機能・相同性 機能・相同性情報分子機能 ドメイン・相同性 構成要素
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 / 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 ... 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 / 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 / integrin alphav-beta3 complex / negative regulation of lipoprotein metabolic process / alphav-beta3 integrin-PKCalpha complex / fibrinogen binding / maintenance of postsynaptic specialization structure / alphav-beta3 integrin-HMGB1 complex / blood coagulation, fibrin clot formation / negative regulation of lipid transport / vascular endothelial growth factor receptor 2 binding / glycinergic synapse / negative regulation of low-density lipoprotein receptor activity / angiogenesis involved in wound healing / Elastic fibre formation / regulation of release of sequestered calcium ion into cytosol / mesodermal cell differentiation / cell-substrate junction assembly / alphav-beta3 integrin-IGF-1-IGF1R complex / platelet-derived growth factor receptor binding / filopodium membrane / extracellular matrix binding / regulation of postsynaptic neurotransmitter receptor internalization / positive regulation of fibroblast migration / positive regulation of vascular endothelial growth factor receptor signaling pathway / 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 / Molecules associated with elastic fibres / positive regulation of leukocyte migration / positive regulation of cell-matrix adhesion / cellular response to insulin-like growth factor stimulus / smooth muscle cell migration / microvillus membrane / negative chemotaxis / cell adhesion mediated by integrin / Syndecan interactions / p130Cas linkage to MAPK signaling for integrins / activation of protein kinase activity / cellular response to platelet-derived growth factor stimulus / cell-substrate adhesion / protein disulfide isomerase activity / positive regulation of smooth muscle cell migration / positive regulation of osteoblast proliferation / TGF-beta receptor signaling activates SMADs / PECAM1 interactions / lamellipodium membrane / GRB2:SOS provides linkage to MAPK signaling for Integrins / negative regulation of macrophage derived foam cell differentiation / platelet-derived growth factor receptor signaling pathway / negative regulation of lipid storage / fibronectin binding / ECM proteoglycans / positive regulation of T cell migration / positive regulation of bone resorption / Integrin cell surface interactions / coreceptor activity / negative regulation of endothelial cell apoptotic process / positive regulation of substrate adhesion-dependent cell spreading / cell adhesion molecule binding / positive regulation of endothelial cell proliferation / embryo implantation / positive regulation of endothelial cell migration / Integrin signaling / substrate adhesion-dependent cell spreading / cell-matrix adhesion / response to activity / Signal transduction by L1 / integrin-mediated signaling pathway / regulation of actin cytoskeleton organization / protein kinase C binding / positive regulation of smooth muscle cell proliferation / Signaling by high-kinase activity BRAF mutants / wound healing / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / MAP2K and MAPK activation / platelet activation / platelet aggregation / ruffle membrane / VEGFA-VEGFR2 Pathway / cell-cell adhesion / 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 / regulation of protein localization 類似検索 - 分子機能 Integrin beta, epidermal growth factor-like domain 1 / Integrin beta epidermal growth factor like domain 1 / Integrin beta subunit, cytoplasmic domain / Integrin beta cytoplasmic domain / Integrin_b_cyt / : / Integrin alpha Ig-like domain 3 / Integrin beta tail domain / Integrin beta subunit, tail / Integrin beta tail domain superfamily ... Integrin beta, epidermal growth factor-like domain 1 / Integrin beta epidermal growth factor like domain 1 / Integrin beta subunit, cytoplasmic domain / Integrin beta cytoplasmic domain / Integrin_b_cyt / : / Integrin alpha Ig-like domain 3 / Integrin beta tail domain / Integrin beta subunit, tail / Integrin beta tail domain superfamily / Integrin_B_tail / Integrin beta subunit, VWA domain / Integrin beta subunit / Integrin beta N-terminal / Integrin beta chain VWA domain / Integrin plexin domain / Integrins beta chain cysteine-rich domain signature. / Integrin beta subunits (N-terminal portion of extracellular region) / Integrin alpha cytoplasmic region / EGF-like domain, extracellular / EGF-like domain / Integrin alpha-2 / Integrin alpha Ig-like domain 1 / : / Integrin alpha Ig-like domain 2 / Integrin alpha chain / Integrin alpha beta-propellor / Integrin alpha chain, C-terminal cytoplasmic region, conserved site / Integrins alpha chain signature. / FG-GAP repeat profile. / Integrin alpha (beta-propellor repeats). / FG-GAP repeat / FG-GAP repeat / Integrin alpha, N-terminal / Integrin domain superfamily / PSI domain / domain found in Plexins, Semaphorins and Integrins / von Willebrand factor A-like domain superfamily / EGF-like domain signature 2. / EGF-like domain signature 1. 類似検索 - ドメイン・相同性生物種 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 詳細 データ登録者Bush MW / Walz T / Coller B / Filizola M / Spasic A / Nesic D / Li J 資金援助 米国, 1件 詳細 詳細を隠すOrganization Grant number 国 National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI) 2R01HL019278-43 米国
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 登録 2021年1月5日 - ヘッダ(付随情報) 公開 2022年1月12日 - マップ公開 2022年1月12日 - 更新 2022年7月27日 - 現状 2022年7月27日 処理サイト : RCSB / 状態 : 公開
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