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Mol Cell Biol. 1991 June; 11(6): 3037-3042

Enhancer-binding activity of the tal-1 oncoprotein in association with the E47/E12 helix-loop-helix proteins.

H L Hsu, J T Cheng, Q Chen and R Baer

Department of Microbiology, University of Texas Southwestern Medical Center, Dallas 75235-9048.

ABSTRACT

Almost 30% of patients with T-cell acute lymphoblastic leukemia (T-ALL) bear structural alterations of tal-1, a presumptive proto-oncogene that encodes sequences homologous to the helix-loop-helix (HLH) DNA-binding and dimerization domain. Analysis of the tal-1 gene product reveals that its HLH domain mediates protein-protein interactions with either of the ubiquitously expressed HLH proteins E47 and E12. The resultant tal-1/E47 and tal-1/E12 heterodimers specifically recognize the E-box DNA sequence motif found in eucaryotic transcriptional enhancers. Hence, the tal-1 protein shares biochemical properties with other tissue-specific HLH proteins that control cell type determination during myogenesis (e.g., MyoD1) and neurogenesis (e.g., achaete-scute). The data suggest that HLH heterodimers involving tal-1 may function in vivo as transcriptional regulatory factors that influence cell type determination during hematopoietic development.

Mol Cell Biol. 1991 June; 11(6): 3037-3042




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