Reversion-inducing cysteine-rich protein with Kazal motifs (RECK)

Functions together with ADGRA2 to enable brain endothelial cells to respond to Wnt7 signals (WNT7A or WNT7B) (PubMed:28289266, PubMed:30026314). Plays a key role in Wnt7-specific answers: required for central nervous system (CNS) angiogenesis and blood-brain barrier regulation (By similarity).

Acts as a Wnt7-specific coactivator of canonical Wnt signaling by decoding Wnt ligands: acts by interacting specifically with the disordered linker region of Wnt7, thereby conferring ligand selectivity for Wnt7 (PubMed:30026314). ADGRA2 is then required to deliver RECK-bound Wnt7 into frizzled by building a higher-order RECK-ADGRA2-Fzd-LRP5-LRP6 complex (PubMed:30026314).