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. 1993 Jun 15;90(12):5588–5592. doi: 10.1073/pnas.90.12.5588

Cloning and expression of GRK5: a member of the G protein-coupled receptor kinase family.

P Kunapuli 1, J L Benovic 1
PMCID: PMC46766  PMID: 7685906

Abstract

Guanine nucleotide binding protein (G-protein)-coupled receptor kinases (GRKs) specifically phosphorylate the agonist-occupied form of G-protein-coupled receptors such as the beta 2-adrenergic receptor and rhodopsin. The best characterized members of this family include the beta-adrenergic receptor kinase (beta ARK) and rhodopsin kinase. To identify additional members of the GRK family, the polymerase chain reaction was used to amplify human heart cDNA using degenerate oligonucleotide primers from highly conserved regions unique to the GRK family. Here we report the isolation of a cDNA that encodes a 590-amino acid protein kinase, termed GRK5, which has 34.8% and 47.2% amino acid identities with beta ARK and rhodopsin kinase, respectively. Interestingly, GRK5 has an even higher homology with Drosophila GPRK-2 (71.0% identity) and the recently identified human IT11 (69.1% identity). Northern blot analysis of GRK5 with selected human tissues reveals a message of approximately 3 kilobases with highest levels in heart, placenta, lung > skeletal muscle > brain, liver, pancreas > kidney. GRK5, overexpressed in Sf9 insect cells using the baculovirus system, was able to phosphorylate rhodopsin in a light-dependent manner. In addition, GRK5 neither contains a consensus sequence for isoprenylation like rhodopsin kinase nor is activated by G-protein beta gamma subunits like beta ARK1. Thus, GRK5 represents a member of the GRK family that likely has a unique physiological role.

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Selected References

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