title: Enhancer-binding activity of the tal-1 oncoprotein in association with the E47/E12 helix-loop-helix proteins.
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.
authors.affiliation: Department of Microbiology, University of Texas Southwestern Medical Center, Dallas 75235-9048.
authors.forename: H L
authors.initials: HL
authors.lastname: Hsu
authors.forename: J T
authors.initials: JT
authors.lastname: Cheng
authors.forename: Q
authors.initials: Q
authors.lastname: Chen
authors.forename: R
authors.initials: R
authors.lastname: Baer
mesh_terms: D001483:Base Sequence; D051792:Basic Helix-Loop-Helix Proteins; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D004742:Enhancer Elements, Genetic; D005982:Glutathione Transferase / Q000235:genetics / Q000378:metabolism; D006801:Humans; D015459:Leukemia-Lymphoma, Adult T-Cell / Q000235:genetics; D046911:Macromolecular Substances; D008969:Molecular Sequence Data; D015345:Oligonucleotide Probes; D011485:Protein Binding; D014176:Protein Biosynthesis; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins / Q000235:genetics* / Q000378:metabolism; D011519:Proto-Oncogenes; D011994:Recombinant Proteins / Q000378:metabolism; D000073942:T-Cell Acute Lymphocytic Leukemia Protein 1; D051820:TCF Transcription Factors; D058125:Transcription Factor 7-Like 1 Protein; D014157:Transcription Factors; D014158:Transcription, Genetic
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; D004268:DNA-Binding Proteins; D005982:Glutathione Transferase; D046911:Macromolecular Substances; D015345:Oligonucleotide Probes; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins; D011994:Recombinant Proteins; D000073942:T-Cell Acute Lymphocytic Leukemia Protein 1; D051820:TCF Transcription Factors; D058125:Transcription Factor 7-Like 1 Protein; D014157:Transcription Factors; C000715470:MAS1 protein, human; C544912:TCF7L1 protein, human; C067143:TAL1 protein, human