CD93
Function
Cell surface receptor that plays a role in various physiological processes including inflammation, phagocytosis, and cell adhesion. Plays a role in phagocytosis and enhances the uptake of apoptotic cells and immune complexes by acting as a receptor for defense collagens including surfactant protein A/SFTPA1, C1q, and mannose-binding lectin (MBL2) (PubMed:7977768). Plays a role in the regulation of endothelial cell function and adhesion by activating angiogenesis (PubMed:24809468). Mechanistically, exerts its angiogenic function by associating with beta-dystroglycan, leading to SRC-dependent phosphorylation and subsequent recruitment of CBL. In turn, CBL provides a docking site for downstream signaling components, such as CRKL to enhance cell migration (PubMed:26848865). Participates in angiogenesis also by acting as a receptor for the ECM pan-endothelial glycoprotein multimerin-2/MMRN2 and IGFBP7 ligands (PubMed:28671670, PubMed:36265539, PubMed:38218180). Both ligands play a non-redundant role in CD93-mediated endothelial cell function (PubMed:38218180). Acts as a key regulator of endothelial barrier function through modulating VEGFR2 function (By similarity).
Post-translational modifications
N- and O-glycosylated.
Phosphorylated on Tyr-628 and Tyr-644 by SRC; these phosphorylations promote endothelial cell adhesion and migration.
Tissue Specificity
Highly expressed in endothelial cells, platelets, cells of myeloid origin, such as monocytes and neutrophils. Not expressed in cells of lymphoid origin.
Cellular localization
- Cell membrane
- Single-pass type I membrane protein
Alternative names
CD93, C1QR1, MXRA4, Complement component C1q receptor, C1q/MBL/SPA receptor, CDw93, Complement component 1 q subcomponent receptor 1, Matrix-remodeling-associated protein 4, C1qR, C1qR(p), C1qRp