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• W2034379667 endingPage "2839" @default.
• W2034379667 startingPage "2831" @default.
• W2034379667 abstract "The G protein-coupled receptor kinases (GRKs) are best known for their role in phosphorylating and desensitising G protein-coupled receptors (GPCRs). The GRKs also regulate signalling downstream of other families of receptors and have a number of non-receptor substrates and binding partners. Here we identify RhoAGTP and Raf1 as novel binding partners of GRK2 and report a previously unsuspected function for this kinase. GRK2 is a RhoA effector that serves as a RhoA-activated scaffold protein for the ERK MAP kinase cascade. The ability of GRK2 to bind to Raf1, MEK1 and ERK2 is dependent on RhoAGTP binding to the catalytic domain of the kinase. Exogenous GRK2 has previously been shown to increase ERK activation downstream of the epidermal growth factor receptor (EGFR). Here we find that GRK2-mediated ERK activation downstream of the EGFR is Rho-dependent and that treatment with EGF promotes RhoAGTP binding and ERK scaffolding by GRK2. Depletion of GRK2 expression by RNAi reveals that GRK2 is required for EGF-induced, Rho- and ERK-dependent thymidine incorporation in vascular smooth muscle cells (VSMCs). We therefore hypothesise that Rho-dependent ERK MAPK scaffolding by GRK2 downstream of the EGFR may have an important role in the vasculature, where increased levels of both GRK2 and RhoA have been associated with hypertension." @default.
• W2034379667 created "2016-06-24" @default.
• W2034379667 creator A5018783661 @default.
• W2034379667 creator A5091465169 @default.
• W2034379667 date "2013-12-01" @default.
• W2034379667 modified "2023-10-02" @default.
• W2034379667 title "G protein-coupled receptor kinase 2 (GRK2) is a Rho-activated scaffold protein for the ERK MAP kinase cascade" @default.
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• W2034379667 doi "https://doi.org/10.1016/j.cellsig.2013.08.031" @default.
• W2034379667 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24018045" @default.
• W2034379667 hasPublicationYear "2013" @default.
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