Specifically phosphorylates the activated forms of G protein-coupled receptors. Such receptor phosphorylation initiates beta-arrestin-mediated receptor desensitization, internalization, and signaling events leading to their desensitization. Seems to be involved in the desensitization of D2-like dopamin receptors in striatum and chemokine receptor CXCR4 which is critical for CXCL12-induced cell chemotaxis. Phosphorylates rhodopsin (RHO) (in vitro) and a non G-protein-coupled receptor: LRP6 during Wnt signaling (in vitro). Widely expressed. Belongs to the protein kinase superfamily. AGC Ser/Thr protein kinase family. GPRK subfamily. 3 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Protein type: AGC group; EC 188.8.131.52; GRK family; GRK subfamily; Kinase, protein; Protein kinase, AGC; Protein kinase, Ser/Thr (non-receptor)