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2016 ; 14
(6
): e1002481
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Regulation of Smoothened Phosphorylation and High-Level Hedgehog Signaling
Activity by a Plasma Membrane Associated Kinase
#MMPMID27280464
Li S
; Li S
; Han Y
; Tong C
; Wang B
; Chen Y
; Jiang J
PLoS Biol
2016[Jun]; 14
(6
): e1002481
PMID27280464
show ga
Hedgehog (Hh) signaling controls embryonic development and adult tissue
homeostasis through the G protein coupled receptor (GPCR)-family protein
Smoothened (Smo). Upon stimulation, Smo accumulates on the cell surface in
Drosophila or primary cilia in vertebrates, which is thought to be essential for
its activation and function, but the underlying mechanisms remain poorly
understood. Here we show that Hh stimulates the binding of Smo to a plasma
membrane-associated kinase Gilgamesh (Gish)/CK1? and that Gish fine-tunes Hh
pathway activity by phosphorylating a Ser/Thr cluster (CL-II) in the
juxtamembrane region of Smo carboxyl-terminal intracellular tail (C-tail). We
find that CL-II phosphorylation is promoted by protein kinase A (PKA)-mediated
phosphorylation of Smo C-tail and depends on cell surface localization of both
Gish and Smo. Consistent with CL-II being critical for high-threshold Hh target
gene expression, its phosphorylation appears to require higher levels of Hh or
longer exposure to the same level of Hh than PKA-site phosphorylation on Smo.
Furthermore, we find that vertebrate CK1? is localized at the primary cilium to
promote Smo phosphorylation and Sonic hedgehog (Shh) pathway activation. Our
study reveals a conserved mechanism whereby Hh induces a change in Smo
subcellular localization to promote its association with and activation by a
plasma membrane localized kinase, and provides new insight into how Hh morphogen
progressively activates Smo.
|*Signal Transduction
[MESH]
|Animals
[MESH]
|Animals, Genetically Modified
[MESH]
|Binding Sites/genetics
[MESH]
|Blotting, Western
[MESH]
|Casein Kinase I/genetics/*metabolism
[MESH]
|Cell Line
[MESH]
|Cell Membrane/*metabolism
[MESH]
|Cilia/genetics/metabolism
[MESH]
|Cyclic AMP-Dependent Protein Kinases/genetics/metabolism
[MESH]