 G protein-coupled receptor kinase 2

G-protein-coupled receptor kinase 2 (GRK2) is an enzyme that in humans is encoded by the "ADRBK1" gene.GRK2 was initially called Beta-adrenergic receptor kinase (βARK or βARK1), and is a member of the G protein-coupled receptor kinase subfamily of the Ser/Thr protein kinases that is most highly similar to GRK3(βARK2).