Endothelial receptor which functions together with RECK to enable brain endothelial cells to selectively respond to Wnt7 signals (WNT7A or WNT7B) (PubMed:25373781, PubMed:25558062, PubMed:28803732). 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 (PubMed:21071672, PubMed:21282641, PubMed:21421844, PubMed:25373781, PubMed:28288111). 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 (By similarity). 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 (By similarity). Binds to the glycosaminoglycans heparin, heparin sulfate, chondroitin sulfate and dermatan sulfate (By similarity). Interacts with RECK; the interaction is direct (PubMed:28803732). Interacts (via PDZ-binding motif) with DLG1 (via PDZ domains) (PubMed:25558062). The cleaved extracellular subunit interacts with the integrin heterodimer ITGAV:ITGB3 (By similarity). Enriched at lateral cell borders and also at sites of cell-ECM (extracellular matrix) contact. Abundantly expressed in the vasculature of the developing embryo (PubMed:11559528, PubMed:21071672, PubMed:21282641). Expression in normal adult tissues is specifically vascular with endothelial expression in CNS, including brain and retina and more widespread pericyte expression in the brain and organs, including the kidney, pancreas and corpus luteum (PubMed:21071672). At 10 dpc expressed in a wide variety of tissues with relatively more abundant expression in limb buds (PubMed:18848646). At 10.5-12.5 dpc, detected in vessels of the developing CNS and perineural vascular plexus (PNVP) (PubMed:21282641). Expressed in both endothelial cells and pericytes, most prominently in brain and neural tube, and to a lesser degrees in non-CNS embryonic organs, including the liver, heart, and kidney (PubMed:18848646, PubMed:21282641). Expressed also in embryonic epithelium of lung and esophagus and in mesenchyme (PubMed:18848646, PubMed:21282641). Detected in mesenchyme of the palatal shelf at 12.5 dpc (PubMed:21282641). Up-regulated by the growth factors activin AB (INHBA: INHBB dimer) and TGFB1 in vitro. 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. Cleaved by thrombin (F2) and MMP1. Also cleaved by MMP9, with lower efficiency. 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. Shedding is enhanced by the growth factor FGF2 and may promote cell survival during angiogenesis. No viable adults (PubMed:21071672, PubMed:21282641, PubMed:21421844). Beginning at 11 dpc, deficient embryos exhibit completely penetrant, progressive CNS hemorrhage originating in forebrain telencephalon and ventral neural tube leading to embryonic lethality from 15.5 dpc (PubMed:21071672, PubMed:21282641, PubMed:21421844). Embryos at 11.5 dpc display selective CNS-specific vascular patterning defects, with markedly reduced angiogenic sprouting into the forebrain telencephalon and thickening of the underlying periventricular vascular plexus rendering the telencephalon virtually avascular (PubMed:21071672, PubMed:21282641, PubMed:21421844, PubMed:25373781). Remaining CNS vessels show significantly increased permeability (PubMed:21421844). Lung size is reduced in 15.5 dpc embryos (PubMed:21282641). Cleft palate is present at 15.5 dpc or later (PubMed:21282641). Conditional knockout mice lacking Adgra2 in the endothelia of adult mice show blood-brain barrier integrity defects in a stroke model and glioblastoma (PubMed:28288111). 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.