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The Journal of Immunology, Vol 158, Issue 5 2251-2258, Copyright © 1997 by American Association of Immunologists

ARTICLES

AML1A and AML1B can transactivate the human IL-3 promoter

H Uchida, J Zhang and SD Nimer
Laboratory of Molecular Aspects of Hematopoiesis, Memorial Sloan- Kettering Cancer Center, New York 10021, USA.

The AML1 gene encodes several transcription factors, including AML1A and AML1B, which bind to DNA via a TGT/cGGT consensus sequence that is found in several promoters, including the human IL-3 promoter. We performed cotransfection experiments in T cells, and demonstrated that although AML1A lacks a putative transactivation domain, it can transactivate the IL-3 promoter nearly as effectively as AML1B, a known activator. A consensus AML1 binding site (TGTGGT), located in the previously identified DNase I footprint region A of the human IL-3 promoter (extending from bp -165 to -128), and a sequence similar to the consensus binding site (TGTGGG), located in footprint region B (bp - 55 to -42), specifically bind AML1 proteins in gel shift assays. The affinity for the TGTGGG sequence was much less than that for the TGTGGT sequence, and mutating the TGTGGG sequence did not alter the IL-3 promoter activity, whereas mutation of the consensus binding site decreased the basal promoter activity and nearly eliminated transactivation by AML1A and AML1B. The AML1/ETO fusion protein, generated by the t(8;21) translocation, repressed IL-3 promoter activity, although the AML1 portion of AML1/ETO (amino acids 1-177) lacked transcriptional regulatory activity and did not bind to DNA in vitro. The 60- to 177-amino acid portion of AML1 readily bound DNA, suggesting that the first 59 amino acids may function as an inhibitory domain for DNA binding. Demonstration of the transactivation by AML1A and localization of a putative inhibitory binding domain suggest additional complexity within this family of transcription factors.


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