Targeted ubiquitination and degradation of G-protein-coupled receptor kinase 5 by the DDB1-CUL4 ubiquitin ligase complex

The G protein-coupled receptor kinases (GRKs) phosphorylate agonist occupied G protein-coupled receptors (GPCRs) and desensitize GPCR-mediated signaling. Recent studies indicate they also function non-catalytically via interaction with other proteins. In this study, a proteomic approach was used to...

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Veröffentlicht in:PloS one 2012-08, Vol.7 (8), p.e43997-e43997
Hauptverfasser: Wu, Ziyan, Chen, Yuejun, Yang, Tong, Gao, Qinqin, Yuan, Man, Ma, Lan
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Chen, Yuejun
Yang, Tong
Gao, Qinqin
Yuan, Man
Ma, Lan
description The G protein-coupled receptor kinases (GRKs) phosphorylate agonist occupied G protein-coupled receptors (GPCRs) and desensitize GPCR-mediated signaling. Recent studies indicate they also function non-catalytically via interaction with other proteins. In this study, a proteomic approach was used to screen interacting proteins of GRK5 in MDA-MB-231 cells and HUVEC cells. Mass spectrometry analysis reveals several proteins in the GRK5 immunocomplex including damaged DNA-binding protein 1 (DDB1), an adaptor subunit of the CUL4-ROC1 E3 ubiquitin ligase complex. Co-immunoprecipitation experiments confirmed the association of GRK5 with DDB1-CUL4 complex, and reveal that DDB1 acts as an adapter to link GRK5 to CUL4 to form the complex. Overexpression of DDB1 promoted, whereas knockdown of DDB1 inhibited the ubiquitination of GRK5, and the degradation of GRK5 was reduced in cells deficient of DDB1. Furthermore, the depletion of DDB1 decreased Hsp90 inhibitor-induced GRK5 destabilization and UV irradiation-induced GRK5 degradation. Thus, our study identified potential GRK5 interacting proteins, and reveals the association of GRK5 with DDB1 in cell and the regulation of GRK5 level by DDB1-CUL4 ubiquitin ligase complex-dependent proteolysis pathway.
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subjects Adapter proteins
Adapters
Animals
Biology
Brain research
Carrier Proteins - metabolism
Cattle
Cell cycle
Cullin Proteins - metabolism
Degradation
Deoxyribonucleic acid
Desensitization
Destabilization
DNA
DNA-binding protein
DNA-Binding Proteins - metabolism
G protein-coupled receptors
G-Protein-Coupled Receptor Kinase 5 - metabolism
Gene expression
Heat shock proteins
HEK293 Cells
Hsp90 protein
Humans
Immunoprecipitation
Irradiation
Kinases
Laboratories
Mass Spectrometry
Mass spectroscopy
Neurobiology
Neurosciences
Pharmacology
Phosphorylation
Proteins
Proteolysis
Proteolysis - radiation effects
Proteomics
Receptor mechanisms
Receptors
RNA polymerase
Science
Scientific imaging
Signaling
U.V. radiation
Ubiquitin
Ubiquitin-protein ligase
Ubiquitination
Ubiquitination - radiation effects
Ultraviolet radiation
Ultraviolet Rays
title Targeted ubiquitination and degradation of G-protein-coupled receptor kinase 5 by the DDB1-CUL4 ubiquitin ligase complex
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