G protein-coupled receptor kinase 6
Definition:
Specifically phosphorylates the activated forms of G protein-coupled receptors. Such receptor phosphorylation initiates beta-arrestin-mediated receptor desensitization, internalization, and signaling events leading to their desensitization. Seems to be involved in the desensitization of D2-like dopamine receptors in striatum and chemokine receptor CXCR4 which is critical for CXCL12-induced cell chemotaxis (By similarity). Phosphorylates rhodopsin (RHO) (in vitro) and a non G-protein-coupled receptor: LRP6 during Wnt signaling (in vitro).
References:
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[1]. Minyong Chen, et al. G Protein-coupled receptor kinases phosphorylate LRP6 in the Wnt pathway. J Biol Chem. 2009 Dec 11;284(50):35040-8. [Content Brief]
[2]. John M Busillo, et al. Site-specific phosphorylation of CXCR4 is dynamically regulated by multiple kinases and results in differential modulation of CXCR4 signaling. J Biol Chem. 2010 Mar 5;285(10):7805-17. [Content Brief]
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