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Sci Signal. 2011 Oct 11;4(194):ra68. doi: 10.1126/scisignal.2002034.

Phosphorylation of Mad controls competition between wingless and BMP signaling.

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1
Howard Hughes Medical Institute and Department of Biological Chemistry, University of California, Los Angeles, CA 90095-1662, USA.

Abstract

Bone morphogenetic proteins (BMPs) and Wnts are growth factors that provide essential patterning signals for cell proliferation and differentiation. Here, we describe a molecular mechanism by which the phosphorylation state of the Drosophila transcription factor Mad determines its ability to transduce either BMP or Wingless (Wg) signals. Previously, Mad was thought to function in gene transcription only when phosphorylated by BMP receptors. We found that the unphosphorylated form of Mad was required for canonical Wg signaling by interacting with the Pangolin-Armadillo transcriptional complex. Phosphorylation of the carboxyl terminus of Mad by BMP receptor directed Mad toward BMP signaling, thereby preventing Mad from functioning in the Wg pathway. The results show that Mad has distinct signal transduction roles in the BMP and Wnt pathways depending on its phosphorylation state.

PMID:
21990430
PMCID:
PMC3215398
DOI:
10.1126/scisignal.2002034
[Indexed for MEDLINE]
Free PMC Article
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