Cited by 40Chromatin Remodeling and CancerGenomics and Chromatin DynamicsEstrogen and related hormone effects

Structural Modeling of GR Interactions with the SWI/SNF Chromatin Remodeling Complex and C/EBP

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Muratcioglu, Serena, Presman, Diego M., Pooley, John R., Grøntved, Lars, Hager, Gordon L., Nussinov, Ruth, Keskin, Ozlem, Gursoy, Attila·2015·Biophysical Journal

Abstract

The glucocorticoid receptor (GR) is a steroid-hormone-activated transcription factor that modulates gene expression. Transcriptional regulation by the GR requires dynamic receptor binding to specific target sites located across the genome. This binding remodels the chromatin structure to allow interaction with other transcription factors. Thus, chromatin remodeling is an essential component of GR-mediated transcriptional regulation, and understanding the interactions between these molecules at the structural level provides insights into the mechanisms of how GR and chromatin remodeling cooperate to regulate gene expression. This study suggests models for the assembly of the SWI/SNF-A (SWItch/Sucrose-NonFermentable) complex and its interaction with the GR. We used the PRISM algorithm (PRotein Interactions by Structural Matching) to predict the three-dimensional complex structures of the target proteins. The structural models indicate that BAF57 and/or BAF250 mediate the interaction between the GR and the SWI/SNF-A complex, corroborating experimental data. They further suggest that a BAF60a/BAF155 and/or BAF60a/BAF170 interaction is critical for association between the core and variant subunits. Further, we model the interaction between GR and CCAAT-enhancer-binding proteins (C/EBPs), since the GR can regulate gene expression indirectly by interacting with other transcription factors like C/EBPs. We observe that GR can bind to bZip domains of the C/EBPα homodimer as both a monomer and dimer of the DNA-binding domain. In silico mutagenesis of the predicted interface residues confirm the importance of these residues in binding. In vivo analysis of the computationally suggested mutations reveals that double mutations of the leucine residues (L317D+L335D) may disrupt the interaction between GR and C/EBPα. Determination of the complex structures of the GR is of fundamental relevance to understanding its interactions and functions, since the function of a protein or a complex is dictated by its structure. In addition, it may help us estimate the effects of mutations on GR interactions and signaling.

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Authors
Muratcioglu, S., Presman, D. M., Pooley, J. R., Grøntved, L., Hager, G. L., Nussinov, R., Keskin, O., & Gursoy, A.
Affiliations
  • National Institutes of Health (US)
  • University of Bristol (GB)
  • University of Southern Denmark (DK)
  • Tel Aviv University (IL)
Venue
Biophysical Journal
Publisher
Elsevier BV
Published
2015-09
Volume
109
Issue
6
Pages
1227-1239
ISSN
0006-3495 (ISSN-L)
OpenAlex
W1712737666
Cited by
39
References
74
Citations by year
2026: 3 · 2025: 2 · 2024: 1 · 2023: 3 · 2022: 2 · 2021: 8 · 2020: 4 · 2019: 1 · 2018: 5 · 2017: 5 · 2016: 4
FWCI
2.03
Type
journal article
Language
en
Open access
Locations
  • Biophysical Journal (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Explore Bristol Research (publishedVersion)
  • University of Southern Denmark Research Portal (University of Southern Denmark) (publishedVersion)
  • Conicet (submittedVersion, cc-by-nc-sa)
Funders
  • National Cancer Institute
  • National Institutes of Health (HHSN261200800001E)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chromatin Remodeling and Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
Keywords
glucocorticoid receptor, SWI/SNF complex, C/EBPα, protein-protein interaction, BAF57, BAF155, BAF170, bZIP domain, transcriptional regulation, chromatin remodeling, protein complex structure prediction, in silico mutagenesis
MeSH terms
Algorithms, Animals, Chromosomal Proteins, Non-Histone, Computers, Analog, Luminescent Proteins, Models, Molecular, Mutation, Receptors, Glucocorticoid, Transfection, Dimerization, CCAAT-Enhancer-Binding Proteins, Chromatin Assembly and Disassembly, Cell Line, Tumor, Mice, Rats

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