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Mol. Cell. Biol., Sep 1997, 5127-5135, Vol 17, No. 9
Copyright © 1997, American Society for Microbiology

Core binding factor cannot synergistically activate the myeloperoxidase proximal enhancer in immature myeloid cells without c-Myb

M Britos-Bray and AD Friedman
Johns Hopkins Oncology Center, Division of Pediatric Oncology, Baltimore, Maryland 21287, USA.

The myeloperoxidase (MPO) gene is transcribed specifically in immature myeloid cells and is regulated in part by a 414-bp proximal enhancer. Mutation of a core binding factor (CBF)-binding site at -288 decreased enhancer activity 30-fold in 32D cl3 myeloid cells cultured in granulocyte colony-stimulating factor (G-CSF). A novel functional analysis, linking the CBF-binding site to an enhancer deletion series, located at -147 an evolutionarily conserved c-Myb-binding site which was required for optimal enhancer activity and synergy with CBF in 32D cells. These sites cooperated in isolation and independent of a precise spacing. Deletional analysis carried out in the absence of the c-Myb- binding site at -147 located at -301 a second c-Myb-binding site which also synergized with CBF to activate the enhancer. A GA-rich region at - 162 contributed to cooperation with CBF when the adjacent c-Myb-binding site was intact. Mutation of both c-Myb-binding sites in the context of the entire enhancer greatly impaired activation by endogenous CBF in 32D cells. Similarly, activation by c-Myb was impaired in constructs lacking the CBF-binding site. CBF and c-Myb were required for induction of MPO proximal enhancer activity when 32D cells differentiated in response to G-CSF. A fusion protein containing the Gal4 DNA-binding domain and the AML-1B activation domain, amino acids 216 to 480, activated transcription alone and cooperatively with c-Myb in nonmyeloid CV-1 cells. Determining how CBF and c-Myb synergize in myeloid cells might contribute to our understanding of leukemogenesis by the AML1-ETO, AML1-MDS1, CBFbeta-SMMHC, and v-Myb oncoproteins.


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