CSNK1A1 phosphorylates SMO dimer

Stable Identifier
Reaction [transition]
Homo sapiens
Locations in the PathwayBrowser
SVG |   | PPTX  | SBGN
Click the image above or here to open this reaction in the Pathway Browser
The layout of this reaction may differ from that in the pathway view due to the constraints in pathway layout
Initial activation of SMO in response to HH occurs with the CSNK1A1-mediated phosphorylation of serine and threonine residues in the C-terminal tail. While many potential CSNK1A1 target residues have been identified in in vitro assays, residues S588, S590, T593 and S595 in the S0 region appear to be the most critical for function (Chen et al, 2011). Initial phosphorylation increases the affinity of the C-terminal tail for both CSNK1A1 and ADRBK1/GRK2, establishing a positive feedback mechanism that promotes further phosphorylation. CSNK1A1 and ADRBK1-mediated phosphorylation is thought to promote an open, activated conformation of the C-terminal tails, analogous to that in Drosophila Smo upon pathway activation (Chen et al, 2011; Chen et al, 2010; Zhao et al, 2007).
Literature References
PubMed ID Title Journal Year
21695114 Sonic Hedgehog dependent phosphorylation by CK1? and GRK2 is required for ciliary accumulation and activation of smoothened

Yue, T, Jia, J, Ma, G, Sasai, N, Briscoe, J, Jiang, J, Chen, Y

PLoS Biol. 2011
20844016 G protein-coupled receptor kinase 2 promotes high-level Hedgehog signaling by regulating the active state of Smo through kinase-dependent and kinase-independent mechanisms in Drosophila

Zhao, Y, Jia, J, Li, S, Tong, C, Liu, Y, Wang, B, Jiang, J, Chen, Y

Genes Dev. 2010
17960137 Hedgehog regulates smoothened activity by inducing a conformational switch

Tong, C, Jiang, J, Zhao, Y

Nature 2007
Catalyst Activity

protein serine/threonine kinase activity of SMO dimer:CSNK1A1 [ciliary membrane]

Inferred From
Cite Us!