细胞定位
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Cell membrane; Single-pass type I membrane protein. Cell projection, lamellipodium membrane. Cell junction, focal adhesi
on. Cell junction, synapse, postsynaptic cell membrane {ECO:0000250|UniProtKB:O54890}; Single-pass type I membrane prote
in {ECO:0000250|UniProtKB:O54890} Cell junction, synapse {ECO:0000250|UniProtKB:O54890}
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功能
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Integrin alpha-V/beta-3 (ITGAV:ITGB3) is a receptor for cytotactin, fibronectin, laminin, matrix metalloproteinase-2, osteo
pontin, 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 alph
a-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 recogni
zes the sequence H-H-L-G-G-G-A-K-Q-A- G-D-V in fibrinogen gamma chain. Following activation integrin alpha- IIb/beta-3 brin
gs 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 (B
y similarity). ITGAV:ITGB3 binds to fractalkine (CX3CL1) and acts as its coreceptor in CX3CR1-dependent fractalkine signali
ng (PubMed:23125415, PubMed:24789099). ITGAV:ITGB3 binds to NRG1 (via EGF domain) and this binding is essential for NRG1-ER
BB signaling (PubMed:20682778). ITGAV:ITGB3 binds to FGF1 and this binding is essential for FGF1 signaling (PubMed:18441324
). ITGAV:ITGB3 binds to FGF2 and this binding is essential for FGF2 signaling (PubMed:). ITGAV:ITGB3 binds to IGF1
and this binding is essential for IGF1 signaling (PubMed:19578119). ITGAV:ITGB3 binds to IGF2 and this binding is essential
for IGF2 signaling (PubMed:28873464). ITGAV:ITGB3 binds to IL1B and this binding is essential for IL1B signaling (PubMed:2
9030430). 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 (PubMed:18635536, PubMed:25398877)
. ITGAV:ITGB3 acts as a receptor for fibrillin-1 (FBN1) and mediates R-G-D-dependent cell adhesion to FBN1 (PubMed:12807887
). In brain, plays a role in synaptic transmission and plasticity. Involved in the regulation of the serotonin neurotransmi
ssion, is required to localize to specific compartments within the synapse the serotonin receptor SLC6A4 and for an appropr
iate reuptake of serotonin. Controls excitatory synaptic strength by regulating GRIA2-containing AMPAR endocytosis, which a
ffects AMPAR abundance and composition (By similarity). ITGAV:ITGB3 act as a receptor for CD40LG (PubMed:31331973).
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