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The neuronal scaffold protein Shank3 mediates signaling and biological function of the receptor tyrosine kinase Ret in epithelial cells

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Official URL:http://www.jcb.org/cgi/reprint/167/5/945
PubMed:View item in PubMed
Creators Name:Schuetz, G. and Rosario, M. and Grimm, J. and Boeckers, T.M. and Gundelfinger, E.D. and Birchmeier, W.
Journal Title:Journal of Cell Biology
Journal Abbreviation:J Cell Biol
Page Range:945-952
Date:6 December 2004
Keywords:Signal Transducing/metabolism Adaptor Proteins, Amino Acid Motifs, Binding Sites, Carrier Proteins, Cell Differentiation, Cell Line, Tumor Cell Line, Epithelial Cells, GRB2 Adaptor Protein, MAP Kinase Signaling System, Neurons, Organogenesis, Protein Binding, Protein Isoforms, Proto-Oncogene Proteins, Proto-Oncogene Proteins c-ret, Receptor Protein-Tyrosine Kinases, Signal Transduction, Animals, Dogs, Mice
Abstract:Shank proteins, initially also described as ProSAP proteins, are scaffolding adaptors that have been previously shown to integrate neurotransmitter receptors into the cortical cytoskeleton at postsynaptic densities. We show here that Shank proteins are also crucial in receptor tyrosine kinase signaling. The PDZ domain-containing Shank3 protein was found to represent a novel interaction partner of the receptor tyrosine kinase Ret, which binds specifically to a PDZ-binding motif present in the Ret9 but not in the Ret51 isoform. Furthermore, we show that Ret9 but not Ret51 induces epithelial cells to form branched tubular structures in three-dimensional cultures in a Shank3-dependent manner. Ret9 but not Ret51 has been previously shown to be required for kidney development. Shank3 protein mediates sustained Erk-MAPK and PI3K signaling, which is crucial for tubule formation, through recruitment of the adaptor protein Grb2. These results demonstrate that the Shank3 adaptor protein can mediate cellular signaling, and provide a molecular mechanism for the biological divergence between the Ret9 and Ret51 isoform.
Publisher:Rockefeller University Press (U.S.A.)
Additional Information:Copyright (c) 2004 by The Rockefeller University Press
Item Type:Article

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