The last 59 amino acids of Smoothened cytoplasmic tail directly bind the protein kinase Fused and negatively regulate the Hedgehog pathway.Report as inadecuate




The last 59 amino acids of Smoothened cytoplasmic tail directly bind the protein kinase Fused and negatively regulate the Hedgehog pathway. - Download this document for free, or read online. Document in PDF available to download.

* Corresponding author 1 IJM - Institut Jacques Monod 2 BS - Biologie systémique 3 Hybrigenics Paris

Abstract : The Hedgehog HH signaling pathway is crucial for the development of many organisms and its inappropriate activation is involved in numerous cancers. HH signal controls the traffic and activity of the seven-pass transmembrane protein Smoothened SMO, leading to the transcriptional regulation of HH-responsive genes. In Drosophila, the intracellular transduction events following SMO activation depend on cytoplasmic multimeric complexes that include the Fused FU protein kinase. Here we show that the regulatory domain of FU physically interacts with the last 52 amino acids of SMO and that the two proteins colocalize in vivo to vesicles. The deletion of this region of SMO leads to a constitutive activation of SMO, promoting the ectopic transcription of HH target genes. This activation is partially dependent of FU activity. Thus, we identify a novel link between SMO and the cytoplasmic complexes and reveal a negative role of the SMO C-terminal region that interacts with FU. We propose that FU could act as a switch, activator in presence of HH signal or inhibitor in absence of HH.





Author: Sébastien Malpel - Sandra Claret - Matthieu Sanial - Amira Brigui - Tristan Piolot - Laurent Daviet - Séverine Martin-Lannerée

Source: https://hal.archives-ouvertes.fr/



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