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- W1993404368 abstract "The RET proto-oncogene encodes two isoforms of a receptor type tyrosine kinase which plays a role in neural crest and kidney development. Distinct germ-line mutations of RET have been associated with the inherited cancer syndromes MEN2A, MEN2B and FMTC as well as with the congenital disorder Hirschsprung disease (HSCR), whereas somatic rearrangements (RET/PTCs) have been frequently detected in the papillary thyroid carcinoma. Despite these findings, suggesting a relevant role for RET product in development and neoplastic processes, little is known about the signalling triggered by this receptor. In this study, we have demonstrated that the transducing adaptor molecule Shc is recruited and activated by both Ret isoforms and by the rearranged cytoplasmatic Ret/ptc2 oncoproteins as well as by the membrane bound receptor activated by MEN2A or by MEN2B associated mutations. Moreover, our analysis has identified the Ret tyrosine residue and the Shc domains involved in the interaction. In fact, here we show that both the phosphotyrosine binding domains of Shc, PTB and SH2, interact with Ret/ptc2 in vitro. However, PTB domain binds 20 folds higher amount of Ret/ptc2 than SH2. The putative binding site for either SH2 and PTB domains has been identified as Tyr586 of Ret/ptc2 (Tyr1062 on proto-Ret). In keeping with this finding, by using RET/PTC2-Y586F mutant, we have demonstrated that this tyrosine residue, the last amino acid but one before the divergence of the two Ret isoforms, is the docking site for Shc." @default.
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- W1993404368 date "1997-02-20" @default.
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- W1993404368 title "Identification of Shc docking site on Ret tyrosine kinase" @default.
- W1993404368 doi "https://doi.org/10.1038/sj.onc.1200896" @default.
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