登録情報 データベース : PDB / ID : 9dao 構造の表示 ダウンロードとリンクタイトル AlphaIIbbeta3 in fully-extended conformation in complex with R6H8 Fab 要素Integrin alpha-IIb Integrin beta-3 R6H8 Fab heavy chain R6H8 Fab light chain 詳細キーワード BLOOD CLOTTING / alphaIIbbeta3 integrin / platelet aggregation / clot retraction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 / integrin alphaIIb-beta3 complex / regulation of postsynaptic neurotransmitter receptor diffusion trapping / maintenance of postsynaptic specialization structure / alphav-beta3 integrin-vitronectin complex / regulation of extracellular matrix organization ... 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 / maintenance of postsynaptic specialization structure / alphav-beta3 integrin-vitronectin complex / regulation of extracellular matrix organization / positive regulation of glomerular mesangial cell proliferation / platelet alpha granule membrane / negative regulation of lipoprotein metabolic process / integrin alphav-beta3 complex / alphav-beta3 integrin-PKCalpha complex / fibrinogen binding / alphav-beta3 integrin-HMGB1 complex / blood coagulation, fibrin clot formation / glycinergic synapse / vascular endothelial growth factor receptor 2 binding / negative regulation of lipid transport / positive regulation of vascular endothelial growth factor signaling pathway / : / regulation of release of sequestered calcium ion into cytosol / Elastic fibre formation / mesodermal cell differentiation / cell-substrate junction assembly / alphav-beta3 integrin-IGF-1-IGF1R complex / platelet-derived growth factor receptor binding / angiogenesis involved in wound healing / filopodium membrane / extracellular matrix binding / positive regulation of fibroblast migration / positive regulation of vascular endothelial growth factor receptor signaling pathway / regulation of bone resorption / apolipoprotein A-I-mediated signaling pathway / positive regulation of cell adhesion mediated by integrin / positive regulation of leukocyte migration / apoptotic cell clearance / wound healing, spreading of epidermal cells / integrin complex / heterotypic cell-cell adhesion / smooth muscle cell migration / Molecules associated with elastic fibres / Mechanical load activates signaling by PIEZO1 and integrins in osteocytes / positive regulation of cell-matrix adhesion / negative chemotaxis / cell adhesion mediated by integrin / cellular response to insulin-like growth factor stimulus / Syndecan interactions / microvillus membrane / p130Cas linkage to MAPK signaling for integrins / positive regulation of smooth muscle cell migration / regulation of postsynaptic neurotransmitter receptor internalization / protein disulfide isomerase activity / cell-substrate adhesion / positive regulation of osteoblast proliferation / PECAM1 interactions / TGF-beta receptor signaling activates SMADs / 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 / Integrin cell surface interactions / positive regulation of bone resorption / positive regulation of T cell migration / negative regulation of endothelial cell apoptotic process / coreceptor activity / cell adhesion molecule binding / cellular response to platelet-derived growth factor stimulus / positive regulation of endothelial cell proliferation / positive regulation of substrate adhesion-dependent cell spreading / positive regulation of endothelial cell migration / Integrin signaling / embryo implantation / substrate adhesion-dependent cell spreading / protein kinase C binding / Turbulent (oscillatory, disturbed) flow shear stress activates signaling by PIEZO1 and integrins in endothelial cells / cell-matrix adhesion / Signal transduction by L1 / response to activity / integrin-mediated signaling pathway / regulation of actin cytoskeleton organization / positive regulation of smooth muscle cell proliferation / wound healing / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / Signaling by high-kinase activity BRAF mutants / MAP2K and MAPK activation / cell-cell adhesion / platelet activation / VEGFA-VEGFR2 Pathway / platelet aggregation / ruffle membrane / cellular response to mechanical stimulus / positive regulation of fibroblast proliferation / positive regulation of angiogenesis / Signaling by RAF1 mutants 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 beta tail domain / : / Integrin alpha Ig-like domain 3 / Integrin EGF domain / Integrin beta subunit, tail ... 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 beta tail domain / : / Integrin alpha Ig-like domain 3 / Integrin EGF domain / Integrin beta subunit, tail / Integrin beta tail domain superfamily / Integrin_B_tail / EGF-like domain, extracellular / EGF-like domain / Integrins beta chain EGF (I-EGF) domain profile. / Integrin alpha cytoplasmic region / Integrin beta subunit, VWA domain / Integrin beta subunit / Integrin beta N-terminal / Integrin beta chain VWA domain / Integrin plexin domain / Integrins beta chain EGF (I-EGF) domain signature. / Integrin beta subunits (N-terminal portion of extracellular region) / Integrin alpha-2 / Integrin alpha Ig-like domain 1 / Integrin alpha chain / Integrin alpha beta-propellor / Integrin alpha chain, C-terminal cytoplasmic region, conserved site / : / Integrin alpha Ig-like domain 2 / Integrins alpha chain signature. / FG-GAP repeat profile. / Integrin alpha (beta-propellor repeats). / FG-GAP repeat / FG-GAP repeat / Integrin domain superfamily / Integrin alpha, N-terminal / PSI domain / domain found in Plexins, Semaphorins and Integrins / von Willebrand factor A-like domain superfamily / EGF-like domain signature 1. / EGF-like domain signature 2. 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 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 : 2.8 Å 詳細データ登録者 Walz, T. / Coller, B.S. / Wang, J.L. / Buitrago, L. / Wang, L. / Li, J.H. 資金援助 米国, 1件 詳細 詳細を隠す組織 認可番号 国 National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI) 5R01HL019278-48 米国
引用ジャーナル : Blood Adv / 年 : 2025タイトル : An αIIbβ3 Ligand-Mimetic Murine Monoclonal Antibody That Produces Platelet Activation by Engaging the FcγIIa Receptor.著者 : Jialing Wang / Lorena Buitrago / Lu Wang / Jihong Li / Thomas Walz / Barry S Coller / 要旨 : To produce a murine monoclonal antibody that binds to αIIbβ3 and inhibits clot retraction (CR) we immunized mice with human platelets and tested hybridoma supernatants for their ability to bind to ... To produce a murine monoclonal antibody that binds to αIIbβ3 and inhibits clot retraction (CR) we immunized mice with human platelets and tested hybridoma supernatants for their ability to bind to αIIbβ3 and inhibit CR. The IgG1 mAb R6H8 completely inhibited CR at 20 µg/ml. Paradoxically, 5 µg/ml R6H8 initiated platelet aggregation and induced P-selectin expression, fibrinogen binding, and PAC-1 binding. At 20 µg/ml, however, R6H8 completely inhibited aggregation induced by peptide SFLLRN (25 µg/ml; T6) and T6-induced fibrinogen and PAC-1 binding to platelets. Platelet aggregation induced by R6H8 was inhibited by mAb IV.3, which blocks the FcγIIa receptor (FcγRIIa), and the Fab fragment of R6H8 did not induce platelet aggregation, suggesting that R6H8 binds to both αIIbβ3 and FcγRIIa. Cryo-EM analysis of the R6H8 Fab-αIIbβ3 complex revealed that R6H8: 1) Binds to the αIIbβ3 RGD binding pocket via an RYD sequence in its heavy chain CDR3, 2) Interacts with β3 Asp126, producing a reorientation of Asp126 and loss of the ADMIDAS Ca2+, and 3) Initiates swing-out of the β3 hybrid domain. We conclude that R6H8 is an αIIbβ3 ligand-mimetic mAb that activates platelets via FcγRIIa at low concentrations and potently inhibits platelet aggregation and clot retraction at high concentrations. R6H8 simulates the actions of a number of pathological antibodies, including platelet-activating antibodies developed after therapy with glycoprotein IIb/IIIa (αIIbβ3) inhibitors and platelet-activating antibodies in heparin-induced thrombocytopenia and vaccine-induced immune thrombotic thrombocytopenia. As such, it may be a valuable reagent for better understanding these disorders and identifying potential therapies. 履歴 登録 2024年8月22日 登録サイト : RCSB / 処理サイト : RCSB改定 1.0 2025年4月9日 Provider : repository / タイプ : Initial release