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The leukaemic oncoproteins Bcr-Abl and Tel-Abl (ETV6/Abl) have altered substrate preferences and activate similar intracellular signalling pathways

Abstract

Inappropriate activation of Abl family kinases plays a crucial role in different human leukaemias. In addition to the well known oncoproteins p190Bcr-Abl and p210Bcr-Abl, Tel-Abl, a novel fusion protein resulting from a different chromosomal translocation, has recently been described. In this study, the kinase specificities of the Bcr-Abl and Tel-Abl proteins were compared to the physiological Abl family kinases c-Abl and Arg (abl related gene). Using short peptides which correspond to the target epitopes in known substrate proteins of Abl family kinases, we found a higher catalytic promiscuity of Bcr-Abl and Tel-Abl. Similar to Bcr-Abl, Tel-Abl was found in complexes with the adapter protein CRKL. In addition, c-Crk II and CRKL are tyrosine phosphorylated and complexed with numerous other tyrosine phosphorylated proteins in Tel-Abl expressing Ba/F3 cells. GTPase analysis with a RasGTP-specific precipitation assay showed constitutive elevation of GTP-loaded Ras in cells expressing the leukaemic Abl proteins. The mitogenic MAPK/Erk kinases as well as Akt/PKB, a kinase implicated to negatively regulate apoptosis, were also constitutively activated by both Bcr-Abl and Tel-Abl. The results indicate that the leukaemic Abl-fusion proteins have catalytic specificities different from the normal kinases c-Abl and Arg and that Tel-Abl is capable to activate at least some pathways which are also upregulated by Bcr-Abl.

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Acknowledgements

We thank Rajasekaran Baskaran and Jean Wang for supplying the 8E9 antibody, the NIH3T3 Bcr-Abl cells and the Abl−/− fibroblasts, Tomoyuki Shishido and Saburo Hanafusa for the Arg antiserum and Ulf Rapp (MSZ, Würzburg) for encouragement and support. J Voss is indebted to the members of his thesis committee for helpful comments and support. The grant support of S Feller, G Posern and C Kardinal by the Deutsche Forschungsgemeinschaft and the Wilhelm-Sander-Stiftung is gratefully acknowledged.

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Voss, J., Posern, G., Hannemann, J. et al. The leukaemic oncoproteins Bcr-Abl and Tel-Abl (ETV6/Abl) have altered substrate preferences and activate similar intracellular signalling pathways. Oncogene 19, 1684–1690 (2000). https://doi.org/10.1038/sj.onc.1203467

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