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: Protein kinase, AGC; Protein kinase, Ser/Thr (non-receptor); Kinase, protein; EC 22.214.171.124; AGC group; GRK family; GRK subfamily
Chromosomal Location of Human Ortholog: 5q35
Cellular Component: membrane
Molecular Function: G-protein coupled receptor kinase activity; protein binding; ATP binding
Biological Process: Wnt receptor signaling pathway; protein amino acid phosphorylation; regulation of G-protein coupled receptor protein signaling pathway
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.