Abstract
Translocations of the chromosomal locus 11q23 that disrupt the MLL gene (alternatively ALL-1 or HRX) are frequently found in children's leukemias. These events fuse the MLL amino terminus in frame with a variety of unrelated proteins. Up to date, 16 different fusion partners have been characterized and more are likely to exist. No general unifying property could yet be detected amongst these proteins. We show here that the frequent MLL fusion partner ENL at 19p13.1 interacts with the human homologue of the mouse Abl-Interactor 1 (ABI1) protein. ABI1 in turn, is fused to MLL in the t(10;11)(p11.2;q23) translocation. ABI1 was identified as an ENL binding protein by a yeast two-hybrid screen. The interaction of ENL and ABI1 could be verified in vitro by far-Western blot assays and GST-pulldown studies as well as in vivo by co-immunoprecipitation experiments. A structure-function analysis identified an internal region of ENL and a composite motif of ABI1 including an SH3 domain as mutual binding partners. These data introduce novel aspects that might contribute to the understanding of the process of leukemogenesis by MLL fusion proteins.
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Acknowledgements
This work was supported by grants from the DFG (SL27/2-1; SFB466-C7) and the Johannes und Frieda Marohn Stiftung (SLA98). MP García-Cuéllar was supported by a postdoctoral fellowship ‘Beca del Ministerio de Educación y Ciencia: Programa de Formación de Personal Investigador en el Extranjero, Spain.’
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García-Cuéllar, M., Schreiner, S., Birke, M. et al. ENL, the MLL fusion partner in t(11;19), binds to the c-Abl interactor protein 1 (ABI1) that is fused to MLL in t(10;11)+. Oncogene 19, 1744–1751 (2000). https://doi.org/10.1038/sj.onc.1203506
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DOI: https://doi.org/10.1038/sj.onc.1203506
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