GRK3 is an alias for the gene, Adrenergic, beta, receptor kinase 2, in humans. Other names include: Beta-adrenergic receptor kinase 2; Beta-ARK-2; G-protein-coupled receptor kinase 3; BARK2. The encoded protein is an enzyme with an amino acid length of 688 and a mass of 79.7 kDa. Other isoforms may exist. GRK3 is a member of the Protein kinase superfamily, AGC Ser/Thr protein kinase family, GPRK subfamily. This gene shares homology with other species, including: Mouse.