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Proteolytic processing of Ci requires phosphorylation by the kinases Sgg/GSK3 and CK1. The newly identified phosphorylation sites form clusters with previously described PKA sites in which phosphorylation by PKA acts to prime subsequent phosphorylation by Sgg/GSK3 and CK1.
Much of our understanding of the Hedgehog (Hh) signaling pathway comes from Drosophila, where a gradient of Hh signaling regulates the function of the transcription factor Cubitus interruptus (Ci) at three levels: protein stabilization, nuclear import, and activation. Regulation of Ci occurs in a cytoplasmic complex containing Ci, the kinesin-like protein Costal-2 (Cos2), the serine-threonine kinase...
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