G Protein-coupled Receptor Kinases of the GRK4 Protein Subfamily Phosphorylate Inactive G Protein-coupled Receptors (GPCRs)*

Background: GPCR phosphorylation by GRKs initiates arrestin binding and signaling switch to G protein-independent pathways. Results: GRK5/6 phosphorylate many inactive GPCRs. GRK2/3 and even permanently membrane-tethered GRK2 mutants phosphorylate only active receptors. Conclusion: Particular receptor-GRK combinations determine the role of GPCR activation in its phosphorylation. Significance: GRKs can phosphorylate active and inactive GPCRs, promoting arrestin recruitment. G protein-coupled receptor (GPCR) kinases (GRKs) play a key role in homologous desensitization of GPCRs. It is widely assumed that most GRKs selectively phosphorylate only active GPCRs. Here, we show that although this seems to be the case for the GRK2/3 subfamily, GRK5/6 effectively phosphorylate inactive forms of several GPCRs, including β2-adrenergic and M2 muscarinic receptors, which are commonly used as representative models for GPCRs. Agonist-independent GPCR phosphorylation cannot be explained by constitutive activity of the receptor or membrane association of the GRK, suggesting that it is an inherent ability of GRK5/6. Importantly, phosphorylation of the inactive β2-adrenergic receptor enhanced its interactions with arrestins. Arrestin-3 was able to discriminate between phosphorylation of the same receptor by GRK2 and GRK5, demonstrating preference for the latter. Arrestin recruitment to inactive phosphorylated GPCRs suggests that not only agonist activation but also the complement of GRKs in the cell regulate formation of the arrestin-receptor complex and thereby G protein-independent signaling.

• Publication year

  2015

• Venue

  Journal of Biological Chemistry

• Publication date

  2015-03-13

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1074/jbc.M115.644773PMID 25770216PMCID PMC4409243
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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