PreprintCited by 541Genomics and Chromatin DynamicsT-cell and B-cell ImmunologyDevelopmental Biology and Gene Regulation

Assembly and function of a TCR alpha enhancer complex is dependent on LEF-1-induced DNA bending and multiple protein-protein interactions.

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Giese, K, Kingsley, C, Kirshner, J R, Grosschedl, R·1995·Genes & Development

Abstract

In this study we examine the molecular basis for the synergistic regulation of the minimal TCR alpha enhancer by multiple proteins. We find that reconstitution of TCR alpha enhancer function in nonlymphoid cells requires expression of the lymphoid-specific proteins LEF-1, Ets-1 and PEBP2 alpha (CBF alpha), and a specific arrangement of their binding sites in the enhancer. We show that Ets-1 cooperates with PEBP2 alpha to bind adjacent sites at one end of the enhancer, forming a ternary complex that is unstable by itself. Stable occupancy of the Ets-1- and PEBP2 alpha-binding sites in a DNase I protection assay was found to depend on both a specific helical phasing relationship with a nonadjacent ATF/CREB-binding site at the other end of the enhancer and on LEF-1. The HMG domain of LEF-1 was found previously to bend the DNA helix in the center of the TCR alpha enhancer. We now show that the HMG domain of the distantly related SRY protein, which also bends DNA, can partially replace LEF-1 in stimulating enhancer function in transfection assays. Taken together with the observation that Ets-1 and members of the ATF/CREB family have the potential to associate in vitro, these data suggest that LEF-1 can coordinate the assembly of a specific higher-order enhancer complex by facilitating interactions between proteins bound at nonadjacent sites.

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Authors
Giese, K., Kingsley, C., Kirshner, J. R., & Grosschedl, R.
Affiliations
Howard Hughes Medical Institute (US)
Venue
Genes & Development
Published
1995-04-15
Volume
9
Issue
8
Pages
995-1008
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2130002948
Cited by
541
References
74
Citations by year
2026: 2 · 2025: 7 · 2024: 3 · 2023: 1 · 2022: 4 · 2021: 4 · 2020: 3 · 2019: 2 · 2018: 1 · 2017: 6 · 2016: 4 · 2015: 5 · 2014: 10 · 2013: 9 · 2012: 17
Type
posted content
Language
en
Open access
Locations
  • Genes & Development (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Howard Hughes Medical Institute
  • McKnight Foundation
  • National Institutes of Health
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
Keywords
LEF1, ETS1, DNA bending, HMG domain, protein-protein interaction, transcriptional regulation
MeSH terms
Amino Acid Sequence, Animals, Base Sequence, Binding Sites, Blood Proteins, Cells, Cultured, DNA-Binding Proteins, Enhancer Elements, Genetic, Gene Expression Regulation, Humans, Models, Genetic, Molecular Sequence Data, Nucleic Acid Conformation, Protein Binding, Proto-Oncogene Proteins, Transcription Factors, Transcription, Genetic, Receptors, Antigen, T-Cell, alpha-beta, Cyclic AMP Response Element-Binding Protein, Macromolecular Substances, Transcription Factor AP-2, Core Binding Factor alpha Subunits, Proto-Oncogene Proteins c-ets, Proto-Oncogene Protein c-ets-1, Activating Transcription Factors, Lymphoid Enhancer-Binding Factor 1

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