Endothelial receptor which functions together with RECK to enable brain endothelial cells to selectively respond to Wnt7 signals (WNT7A or WNT7B) (PubMed:28289266, PubMed:30026314). Plays a key role in Wnt7-specific responses, such as endothelial cell sprouting and migration in the forebrain and neural tube, and establishment of the blood-brain barrier (By similarity). Acts as a Wnt7-specific coactivator of canonical Wnt signaling: required to deliver RECK-bound Wnt7 to frizzled by assembling a higher-order RECK-ADGRA2-Fzd-LRP5-LRP6 complex (PubMed:30026314). ADGRA2-tethering function does not rely on its G-protein coupled receptor (GPCR) structure but instead on its combined capacity to interact with RECK extracellularly and recruit the Dishevelled scaffolding protein intracellularly (PubMed:30026314). Binds to the glycosaminoglycans heparin, heparin sulfate, chondroitin sulfate and dermatan sulfate (PubMed:16982628). Interacts with RECK; the interaction is direct (By similarity). Interacts (via PDZ-binding motif) with DLG1 (via PDZ domains) (PubMed:15021905). The cleaved extracellular subunit interacts with the integrin heterodimer ITGAV:ITGB3 (PubMed:16982628). Enriched at lateral cell borders and also at sites of cell-ECM (extracellular matrix) contact. Expressed in endothelial cells (at protein level) (PubMed:15021905, PubMed:16982628). Abundantly expressed in heart, placenta, ovary, small intestine, and colon (PubMed:15021905). The leucine-rich repeats (LRRs) are important for potentiation of Wnt7 signaling. The RGD motif is involved in integrin ITGAV:ITGB3 binding. Glycosylated. Proteolytically cleaved into two subunits, an extracellular subunit and a seven-transmembrane subunit (PubMed:22013897, PubMed:16982628). Cleaved by thrombin (F2) and MMP1 (PubMed:22013897). Also cleaved by MMP9, with lower efficiency (PubMed:22013897, PubMed:16982628). Presence of the protein disulfide-isomerase P4HB at the cell surface is additionally required for shedding of the extracellular subunit, suggesting that the subunits are linked by disulfide bonds (PubMed:22013897). Shedding is enhanced by the growth factor FGF2 and may promote cell survival during angiogenesis (PubMed:16982628). Belongs to the G-protein coupled receptor 2 family. Adhesion G-protein coupled receptor (ADGR) subfamily. It is uncertain whether Met-1 or Met-8 is the initiator. Truncated N-terminus. Truncated N-terminus. Truncated N-terminus. Extended N-terminus.