Sequence-Specific Binding of Human Ets-1 to the T Cell Receptor α Gene Enhancer

• Published in: Science (American Association for the Advancement of Science) Vol. 250; no. 4982; pp. 814 - 818
• Main Authors: I-Cheng Ho, Bhat, Narayan K., Gottschalk, Lisa R., Lindsten, Tullia, Thompson, Craig B., Papas, Takis S., Leiden, Jeffrey M.
• Format: Journal Article
• Language: English
• Published: Washington, DC American Society for the Advancement of Science 09.11.1990; American Association for the Advancement of Science
• Subjects: Antigen receptors, T cell; Base Sequence; Binding sites; Binding, Competitive; Biological and medical sciences; Cloning, Molecular; Complementary DNA; DNA; DNA - genetics; DNA Mutational Analysis; DNA probes; Enhancer Elements, Genetic; Fundamental and applied biological sciences. Psychology; Gene Expression Regulation; Gene Rearrangement, T-Lymphocyte; Genes; Genes. Genome; Genetic mutation; Humans; Immunoblotting; Molecular and cellular biology; Molecular genetics; Molecular Sequence Data; Nuclear proteins; Oligonucleotide probes; Protein binding; Proto-Oncogene Protein c-ets-1; Proto-Oncogene Proteins - genetics; Proto-Oncogene Proteins - metabolism; Proto-Oncogene Proteins c-ets; Proto-Oncogenes; Receptors; Receptors, Antigen, T-Cell - genetics; Receptors, Antigen, T-Cell - metabolism; T cell antigen receptors; T cells; T lymphocytes; Transcription Factors; Transcription, Genetic; Human; Binding; Sequence specificity; Immunogenetics; Enhancer sequence; T cell receptor; Gene; C-Onc gene; DNA binding protein; Molecular interaction; Gel retardation technique; Property structure relationship
• ISSN: 0036-8075; 1095-9203
• DOI: 10.1126/science.2237431

Expression of the human T cell receptor (TCR) α gene is regulated by a T cell-specific transcriptional enhancer that is located 4.5 kilobases (kb) 3′ to the Cα gene segment. The core enhancer contains two nuclear protein binding sites, Tα1 and Tα2, which are essential for full enhancer activity. Tα1 contains a consensus cyclic adenosine monophosphate (cAMP) response element (CRE) and binds a set of ubiquitously expressed CRE binding proteins. In contrast, the transcription factors that interact with the Tα2 site have not been defined. In this report, a λgt11 expression protocol was used to isolate a complementary DNA (cDNA) that programs the expression of a Tα2 binding protein. DNA sequence analysis demonstrated that this clone encodes the human ets-1 proto-oncogene. Lysogen extracts produced with this cDNA clone contained a β-galactosidase-Ets-1 fusion protein that bound specifically to a synthetic Tα2 oligonucleotide. The Ets-1 binding site was localized to a 17-base pair (bp) region from the 3′ end of Tα2. Mutation of five nucleotides within this sequence abolished both Ets-1 binding and the activity of the TCR α enhancer in T cells. These results demonstrate that Ets-1 binds in a sequence-specific fashion to the human TCR α enhancer and suggest that this developmentally regulated proto-oncogene functions in regulating TCR α gene expression.