Recombinant Human G protein-coupled receptor kinase 4 (GRK4)

Uniprot Id

P32298

Target Species

Human

Target Name

GRK4

Target Full Name

G protein-coupled receptor kinase 4

Target Function

Specifically phosphorylates the activated forms of G protein-coupled receptors. GRK4-alpha can phosphorylate rhodopsin and its activity is inhibited by calmodulin; the other three isoforms do not phosphorylate rhodopsin and do not interact with calmodulin. GRK4-alpha and GRK4-gamma phosphorylate DRD3. Phosphorylates ADRB2.

Target Subcellular Location

Cytoplasm. Cytoplasm, cell cortex. Note=Both at the cell surface and dispersed in the cytoplasm under basal conditions. Receptor stimulation results in the internalization of GRK4 to the perinuclear area, where colocalization with DRD3 is observed strongly at 5 and 15 minutes. DRD3 and GRK4 colocalize in lipid rafts of renal proximal tubule cells.

Target Protein Families

Protein kinase superfamily, AGC Ser/Thr protein kinase family, GPRK subfamily

Target Tissue Specificity

Isoform 1, isoform 2, isoform 3, and isoform 4 are expressed in testis. Isoform 4 is expressed in myometrium.

Target Synonyms

G protein coupled receptor kinase 4; G protein-coupled receptor kinase 2 (Drosophila)-like; G protein-coupled receptor kinase 4; G protein-coupled receptor kinase GRK4; G proteinm coupled receptor kinase GRK4; GPRK2L; GPRK4; GRK4; GRK4_HUMAN; GRK4a; ITI1

Target Background

This gene encodes a member of the guanine nucleotide-binding protein (G protein)-coupled receptor kinase subfamily of the Ser/Thr protein kinase family. The protein phosphorylates the activated forms of G protein-coupled receptors thus initiating its deactivation. This gene has been linked to both genetic and acquired hypertension. Several transcript variants encoding different isoforms have been found for this gene.