lmmol · Proteins

Integrin beta-3

UniProt P05106 Organism Homo sapiens Gene GP3A, ITGB3

Also known as: GP3A, ITGB3

Function

Integrin alpha-V/beta-3 (ITGAV:ITGB3) is a receptor for cytotactin, fibronectin, laminin, matrix metalloproteinase-2, osteopontin, osteomodulin, prothrombin, thrombospondin, vitronectin and von Willebrand factor. Integrin alpha-IIb/beta-3 (ITGA2B:ITGB3) is a receptor for fibronectin, fibrinogen, plasminogen, prothrombin, thrombospondin and vitronectin. Integrins alpha-IIb/beta-3 and alpha-V/beta-3 recognize the sequence R-G-D in a wide array of ligands. Integrin alpha-IIb/beta-3 recognizes the sequence H-H-L-G-G-G-A-K-Q-A-G-D-V in fibrinogen gamma chain (By similarity). Following activation integrin alpha-IIb/beta-3 brings about platelet/platelet interaction through binding of soluble fibrinogen. This step leads to rapid platelet aggregation which physically plugs ruptured endothelial surface. Fibrinogen binding enhances SELP expression in activated platelets (By similarity). ITGAV:ITGB3 binds to fractalkine (CX3CL1) and acts as its coreceptor in CX3CR1-dependent fractalkine signaling. ITGAV:ITGB3 binds to NRG1 (via EGF domain) and this binding is essential for NRG1-ERBB signaling. ITGAV:ITGB3 binds to FGF1 and this binding is essential for FGF1 signaling. ITGAV:ITGB3 binds to FGF2 and this binding is essential for FGF2 signaling. ITGAV:ITGB3 binds to IGF1 and this binding is essential for IGF1 signaling. ITGAV:ITGB3 binds to IGF2 and this binding is essential for IGF2 signaling. ITGAV:ITGB3 binds to IL1B and this binding is essential for IL1B signaling. ITGAV:ITGB3 binds to PLA2G2A via a site (site 2) which is distinct from the classical ligand-binding site (site 1) and this induces integrin conformational changes and enhanced ligand binding to site 1. ITGAV:ITGB3 acts as a receptor for fibrillin-1 (FBN1) and mediates R-G-D-dependent cell adhesion to FBN1. In brain, plays a role in synaptic transmission and plasticity. Involved in the regulation of the serotonin neurotransmission, is required to localize to specific compartments within the synapse the serotonin receptor SLC6A4 and for an appropriate reuptake of serotonin. Controls excitatory synaptic strength by regulating GRIA2-containing AMPAR endocytosis, which affects AMPAR abundance and composition (By similarity). ITGAV:ITGB3 act as a receptor for CD40LG. ITGAV:ITGB3 acts as a receptor for IBSP and promotes cell adhesion and migration to IBSP. Integrin ITGA2B:ITGB3 is also the receptor of the erythrocyte-specific ICAM4 ligand involved in heterotypic cell-cell adhesion between erythrocytes and activated platelets.

Classification

Family (Pfam)
PF07974 EGF_2, PF23105 EGF_integrin, PF18372 I-EGF_1, PF08725 Integrin_b_cyt, PF07965 Integrin_B_tail, PF00362 Integrin_beta, PF17205 PSI_integrin
InterPro
EGF_extracell, EGF_integrin_1, EGF_integrin_2, Integrin_beta_N, Integrin_bsu, Integrin_bsu_cyt_dom, Integrin_bsu_tail, Integrin_bsu_tail_dom_sf, Integrin_bsu_VWA, Integrin_dom_sf, Integrin_I-EGF_CS, PSI, vWFA_dom_sf
Functional cluster
Venom Serine Proteases & Phospholipase A2

Experimental structures · PDB · 116

A predicted model is available from AlphaFold.

Gene Ontology · 101

Disease associations

Drugs targeting this protein · 5

Related proteins · sequence + function similarity

Co-cited proteins · studied together in the literature

Literature · 108 cited papers

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