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Tumorigenic N-terminal deletions of c-Myb modulate DNA binding, transactivation, and cooperativity with C/EBP

Item Type:Article
Title:Tumorigenic N-terminal deletions of c-Myb modulate DNA binding, transactivation, and cooperativity with C/EBP
Creators Name:Oelgeschlager, M. and Kowenz-Leutz, E. and Schreek, S. and Leutz, A. and Luescher, B.
Abstract:Oncogenic activation of c-myb by retroviral insertion has been implicated in tumor formation in chicken and mice. These genetic alterations result in deregulated expression of the c-myb gene and frequently in N-terminal truncation of the c-Myb protein. We demonstrate that truncation of the c-Myb N-terminus affects DNA binding and reporter activation. However, all three mutants, Myb{delta}N20, MybΔN47 and MybΔN71 cooperated with C/EBP{beta} in reporter assays. In contrast to Myb{delta}N20 and Myb{delta}N47, however, the Myb{delta}N71 mutant failed to activate the chromatin embedded endogenous mim-1 gene together with C/EB{beta}. This suggests that an N-terminal region (amino acids 47-71) within repeat 1 (R1) of the murine c-Myb DNA binding domain affects activation of chromosomal target genes in collaboration with C/EBP{beta}.
Keywords:Differentiaion, Hematopoiesis, Leukemia, Oncogene, Transcription, Animals, Mice
Source:Oncogene
ISSN:0950-9232
Publisher:Nature Publishing Group (U.K.)
Volume:20
Number:50
Page Range:7420-7424
Date:1 January 2001
PubMed:View item in PubMed

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