Abstract
Hedgehog (Hh) signaling plays a crucial role in the formation and maintenance of tissues in most animals. The key activator of cytoplasmic Hh signaling is an atypical G-protein-coupled receptor (GPCR) family protein called Smoothened (Smo). In response to binding of Hh ligands to their receptor Patched, Smo is conformationally activated by extensive phosphorylation of its cytoplasmic C-terminus and engages downstream pathway components to promote Hh target gene expression. GPCR kinases (GRKs) positively regulate Hh signaling, a function that has been conserved in both invertebrates and vertebrates. Direct phosphorylation of highly conserved clusters of Ser/Thr residues in the proximal Smo C-terminus by GRKs is important in controlling Smo trafficking and activating signaling. GRKs also indirectly affect Hh pathway activity by influencing cellular cAMP levels and thus the activity of protein kinase A, a key regulator of the Cubitus interruptus/GLI family transcription factors that mediate Hh transcriptional responses. This indirect role hints at a broader interconnectivity between GRKs, GPCR signaling, and Hh pathway function, an idea supported by the recent identification of several GPCRs that are capable of modulating Hh target gene expression.
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Maier, D., Hipfner, D.R. (2016). Evolutionarily Conserved Role of G-Protein-Coupled Receptor Kinases in the Hedgehog Signaling Pathway. In: Gurevich, V., Gurevich, E., Tesmer, J. (eds) G Protein-Coupled Receptor Kinases. Methods in Pharmacology and Toxicology. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-3798-1_14
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