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Published online 16 July 2001. doi:10.1083/jcb.200102032
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© The Rockefeller University Press, 0021-9525/2001/7/345 $5.00
The Journal of Cell Biology, Volume 154, Number 2, July 23, 2001 345-354


Article

Novel p62dok family members, dok-4 and dok-5, are substrates of the c-Ret receptor tyrosine kinase and mediate neuronal differentiation

Jan Grimm1, Martin Sachs1, Stefan Britsch1, Silvana Di Cesare1, Thomas Schwarz-Romond1, Kari Alitalo2 and Walter Birchmeier1

1 Max-Delbrueck-Center for Molecular Medicine, 13092 Berlin, Germany
2 Molecular/Cancer Biology Laboratory, Haartman Institute, University of Helsinki, 00014 Helsinki, Finland

Address correspondence to W. Birchmeier, Max-Delbrueck-Center for Molecular Medicine, Robert-Roessle-Strasse 10, 13092 Berlin, Germany. Tel.: (49) 309-406-3800. Fax: (49) 309-406-2656. E-mail: wbirch{at}mdc-berlin.de

Docking proteins are substrates of tyrosine kinases and function in the recruitment and assembly of specific signal transduction molecules. Here we found that p62dok family members act as substrates for the c-Ret receptor tyrosine kinase. In addition to dok-1, dok-2, and dok-3, we identified two new family members, dok-4 and dok-5, that can directly associate with Y1062 of c-Ret. Dok-4 and dok-5 constitute a subgroup of dok family members that is coexpressed with c-Ret in various neuronal tissues. Activated c-Ret promotes neurite outgrowth of PC12 cells; for this activity, Y1062 in c-Ret is essential. c-Ret/dok fusion proteins, in which Y1062 of c-Ret is deleted and replaced by the sequences of dok-4 or dok-5, induce ligand-dependent axonal outgrowth of PC12 cells, whereas a c-Ret fusion containing dok-2 sequences does not elicit this response. Dok-4 and dok-5 do not associate with rasGAP or Nck, in contrast to p62dok and dok-2. Moreover, dok-4 and dok-5 enhance c-Ret–dependent activation of mitogen-activated protein kinase. Thus, we have identified a subclass of p62dok proteins that are putative links with downstream effectors of c-Ret in neuronal differentiation.

Key Words: signal transduction; yeast two-hybrid system; docking proteins; neural development; endothelia


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