Cited by 66Genomics and Chromatin DynamicsT-cell and B-cell ImmunologyDevelopmental Biology and Gene Regulation

Transcription Factor Pip Can Enhance DNA Binding by E47, Leading to Transcriptional Synergy Involving Multiple Protein Domains

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Nagulapalli, Sujatha, Atchison, Michael L.·1998·Molecular and Cellular Biology

Abstract

The transcription factors E2A (E12/E47) and Pip are both required for normal B-cell development. Each protein binds to regulatory sequences within various immunoglobulin enhancer elements. Activity of E2A proteins can be regulated by interactions with other proteins which influence their DNA binding or activation potential. Similarly, Pip function can be influenced by interaction with the protein PU.1, which can recruit Pip to bind to DNA. We show here that a previously unidentified Pip binding site resides adjacent to the E2A binding site within the immunoglobulin kappa 3' enhancer. Both of these binding sites are crucial for high-level enhancer activity. We found that E47 and Pip can functionally interact to generate a very potent 100-fold transcriptional synergy. Through a series of mutagenesis experiments, we identified the Pip sequences necessary for transcriptional activation and for synergy with E47. Two synergy domains (residues 140 to 207 and 300 to 420) in addition to the Pip DNA binding domain (residues 1 to 134) are required for maximal synergy with E47. We also identified a Pip domain (residues 207 to 300) that appears to mask Pip transactivation potential. Part of the synergy mechanism between E47 and Pip appears to involve the ability of Pip to increase DNA binding by E47, perhaps by inducing a conformational change in the E47 protein. E47 may also induce a conformational change in Pip which unmasks sequences important for transcriptional activity. Based upon our results, we propose a model for E47-Pip transcriptional synergy.

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  • ICSBP interacts with E47 on the element composed of an IRS-like sequence and the E2A binding site found in the Igκ 3' enhancer to activate transcription, like IRF-4.

    “ICSBP was also shown to interact with E47 (encoded by the E2A gene) on the element composed of IRS-like sequence and the E2A binding site found in the Ig k 3 9 enhancer to activate transcription, again like IRF-4. (5,32)”
  • IRF-4 interacts with some partners common to ICSBP, namely PU.1 and E47.

    “IRF-4 is similar to ICSBP in structure, interacts with some common partners (PU.1 and E47), and regulates an overlapping set of target promoters. (31,32,63,64)”
  • IRF-4 regulates an overlapping set of target promoters with ICSBP.

    “IRF-4 is similar to ICSBP in structure, interacts with some common partners (PU.1 and E47), and regulates an overlapping set of target promoters. (31,32,63,64)”
  • IRF-4 is similar to ICSBP in structure.

    “IRF-4 is similar to ICSBP in structure, interacts with some common partners (PU.1 and E47), and regulates an overlapping set of target promoters. (31,32,63,64)”

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Authors
Nagulapalli, S., & Atchison, M. L.
Affiliations
University of Pennsylvania (US)
Venue
Molecular and Cellular Biology
Published
1998-08
Volume
18
Issue
8
Pages
4639-4650
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2129093323
Cited by
66
References
69
Citations by year
2024: 1 · 2022: 2 · 2020: 2 · 2019: 1 · 2018: 1 · 2016: 1 · 2015: 1 · 2014: 3 · 2012: 2
FWCI
1.16
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute of General Medical Sciences (GM-42415, R01GM042415)
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
E47, E2A, transcriptional synergy, DNA binding, enhancer activity, PU.1, B cell development, protein-protein interaction, transcriptional activation, protein conformational change
MeSH terms
Interferon Regulatory Factor-8, Interferon Regulatory Factor-4, Animals, Binding Sites, DNA-Binding Proteins, Enhancer Elements, Genetic, Immunoglobulin kappa-Chains, Recombinant Fusion Proteins, Repressor Proteins, Structure-Activity Relationship, Transcription Factors, Transcription, Genetic, Tumor Cells, Cultured, Transcriptional Activation, Trans-Activators, 3T3 Cells, Interferon Regulatory Factors, Mice, TCF Transcription Factors, Transcription Factor 7-Like 1 Protein

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