Abstract
The c-Cbl proto-oncogene acts as an E3 ubiquitin ligase via its RING finger domain to negatively regulate activated cellular signal transduction pathways. We have identified an aberrant Cbl-protein of approximately 95 kDa, which we have called p95Cbl, from the murine reticulum sarcoma cell-line, J-774. Cloning of the p95Cbl cDNA revealed that it contains a deletion resulting in the loss of 111 amino acids, eliminating two critical tyrosine residues in the linker region as well as the entire RING finger domain. p95Cbl displays a propensity for its interaction with the Src-family kinase Hck over cellular Cbl expressed in the same cells. Like its wildtype counterpart, p95Cbl is inducibly tyrosine phosphorylated in response to Fcγ receptor engagement on hematopoietic cells, however this phosphorylation is sustained beyond that of cellular Cbl. NIH3T3 fibroblasts stably expressing p95Cbl acquire the typical refractile morphology associated with cellular transformation and form colonies in a focus-formation assay. The exogenously expressed mutant protein is constitutively phosphorylated in fibroblasts and partitions into the particulate fraction of cells, while cellular Cbl is exclusively cytoplasmic. p95Cbl is a novel, oncogenic mutant of the c-Cbl proto-oncogene, which might act in a dominant negative fashion to prolong normal cellular signaling responses by interfering with the down-regulation of activated signaling complexes through c-Cbl.
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Acknowledgements
We would like to thank the members of the laboratory for their constructive comments and discussions during the course of this work. This work was supported by grants from the Canadian Institutes of Health Research and the Cancer Research Society of Canada. SA Bisson is supported by an Alberta Heritage Foundation for Medical Research (AHFMR) Studentship and an Honorary Izaak Walton Killam Scholarship (University of Calgary). SM Robbins is a Senior Scholar of the AHFMR and holds a Canada Research Chair in Cancer Biology.
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Bisson, S., Ujack, E. & Robbins, S. Isolation and characterization of a novel, transforming allele of the c-Cbl proto-oncogene from a murine macrophage cell line. Oncogene 21, 3677–3687 (2002). https://doi.org/10.1038/sj.onc.1205510
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DOI: https://doi.org/10.1038/sj.onc.1205510
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