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- W2072678051 abstract "Cbl has emerged as a novel signal transducing protein downstream of a number of cell surface receptors coupled to tyrosine kinases. Identified as the protein product of the c-cbl proto-oncogene, the cellular homolog to the transforming gene of a murine retrovirus, Cbl comprises an N-terminal transforming region (Cbl-N), which contains a phosphotyrosine binding (PTB) domain, and a C-terminal modular region (Cbl-C) containing a RING finger motif, a large proline-rich region and a leucine zipper. Deletion of Cbl-C or small deletions N-terminal to the RING finger render Cbl oncogenic, whereas wild type Cbl is non-transforming, even if overexpressed. Cbl serves as a substrate of both receptor and non-receptor tyrosine kinases, and binds to adaptor proteins Grb2, Crk and the p85 subunit of PI-3-kinase. Additionally, both Caenorhabditis elegans and Drosophila Cbl homologs, SLI-1 and D-Cbl, respectively, have been identified as negative regulators of the LET-23/DER receptor tyrosine kinases. Finally, oncogenic mutants of Cbl, when expressed in fibroblasts, upregulate the signaling cascade downstream of the platelet-derived growth factor receptor α in a Cbl-PTB domain-dependent manner. Together, these findings position Cbl as a central player in the regulation of tyrosine kinase signaling pathways. Identification of the Cbl-PTB domain binding motifs on tyrosine kinases and elucidation of the mechanisms of Cbl's negative regulatory effect may provide a new avenue to control tyrosine kinases for therapeutic purposes." @default.
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- W2072678051 date "1998-04-30" @default.
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- W2072678051 title "Molecules in focus: The c-Cbl oncoprotein" @default.
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- W2072678051 doi "https://doi.org/10.1016/s1357-2725(97)00075-7" @default.
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