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• W2116718060 abstract "G protein-coupled receptor kinase 2 (GRK2) plays a fundamental role in the regulation of G protein-coupled receptors (GPCRs), and changes in GRK2 expression levels can have an important impact on cell functions. GRK2 is known to be degraded by the proteasome pathway. We have shown previously that β-arrestins participate in enhanced kinase turnover upon GPCR stimulation by facilitating GRK2 phosphorylation by c-Src or by MAPK or by recruiting the Mdm2 E3 ubiquitin ligase to the receptor complex. In this report, we have investigated how such diverse β-arrestin scaffold functions are integrated to modulate GRK2 degradation. Interestingly, we found that in the absence of GPCR activation, β-arrestins do not perform an adaptor role for GRK2/Mdm2 association, but rather compete with GRK2 for direct Mdm2 binding to regulate basal kinase turnover. Upon agonist stimulation, β-arrestins-mediated phosphorylation of GRK2 at serine 670 by MAPK facilitates Mdm2-mediated GRK2 degradation, whereas c-Src-dependent phosphorylation would support the action of an undetermined β-arrestin-recruited ligase in the absence of GPCR activation. The ability of β-arrestins to play different scaffold functions would allow coordination of both Mdm2-dependent and -independent processes aimed at the specific modulation of GRK2 turnover in different signaling contexts." @default.
• W2116718060 created "2016-06-24" @default.
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• W2116718060 date "2011-01-01" @default.
• W2116718060 modified "2023-10-14" @default.
• W2116718060 title "Multiple Scaffolding Functions of β-Arrestins in the Degradation of G Protein-coupled Receptor Kinase 2" @default.
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• W2116718060 doi "https://doi.org/10.1074/jbc.m110.203406" @default.
• W2116718060 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3020723" @default.
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