Enables G protein-coupled receptor kinase activity. Predicted to be involved in several processes, including cellular protein metabolic process; desensitization of G protein-coupled receptor signaling pathway; and inositol phosphate metabolic process. Predicted to act upstream of or within phosphorylation. Predicted to be located in several cellular components, including Z disc; dendrite; and sperm midpiece. Is expressed in adrenal gland; alimentary system; nervous system; retina; and vibrissa. Orthologous to human GRK3 (G protein-coupled receptor kinase 3). [provided by Alliance of Genome Resources, Apr 2022]