Adrenergic Receptor Beta Kinase 2 (ADRbK2)

The beta-adrenergic receptor kinase specifically phosphorylates the agonist-occupied form of the beta-adrenergic and related G protein-coupled receptors. Overall, the beta adrenergic receptor kinase 2 has 85% amino acid similarity with beta adrenergic receptor kinase 1, with the protein kinase catalytic domain having 95% similarity. These data suggest the existence of a family of receptor kinases which may serve broadly to regulate receptor function.
Beta adrenergic receptor kinase-2 (ARBK2, BARK-2, G-protein-coupled receptor kinase 3, GRK3) is an intracellular enzyme that phosphorylates G protein-coupled receptors. It was cloned from mice and rats in 1991. The human gene was cloned in 1993.