Cited by 113Estrogen and related hormone effectsGenomics and Chromatin DynamicsReceptor Mechanisms and Signaling

Homodimerization of the Glucocorticoid Receptor Is Not Essential for Response Element Binding: Activation of the Phenylethanolamine N-Methyltransferase Gene by Dimerization-Defective Mutants

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Adams, Melanie, Meijer, Onno C., Wang, Jian, Bhargava, Aditi, Pearce, David·2003·Molecular Endocrinology

Abstract

We have tested the commonly held hypothesis that glucocorticoid receptors (GRs) must dimerize via their DNA binding domain (DBD) to bind to glucocorticoid response elements (GRE) and induce gene expression. Guided by the GR dimerization-deficient dim/dim knock-in mouse, which expresses normal mRNA levels of the strictly GR-dependent phenylethanolamine N-methyltransferase (PNMT) gene, we analyzed in detail the regulation of the PNMT 5'-flanking region using wild-type GR (GRwt) and GR dimer mutants (GRdms). We demonstrated that mouse and rat PNMT 5'-regulatory fragments are more strongly induced by GRdms than by GRwt. Footprinting analysis revealed five regions where a GR-DBD peptide could bind. We delineated a 105-bp region containing two footprints with near-consensus glucocorticoid response elements and multiple half-sites that was sufficient for transactivation via both GRwt and GRdms. Finally, we demonstrated direct binding of GRdms proteins to this responsive region using EMSA. We propose that on a subset of GR-responsive promoters, exemplified by the PNMT gene, GRs can form concerted multimers in a manner that is independent of the DBD-dimer interface. We further suggest that protein-DNA and protein-protein interactions that support such complexes are essential for activation of this type of gene, and that DNA binding of GR might be essential to survival.

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Authors
Adams, M., Meijer, O. C., Wang, J., Bhargava, A., & Pearce, D.
Affiliations
University of California, San Francisco (US)
Corresponding author
Pearce, David
Venue
Molecular Endocrinology
Published
2003-12
Volume
17
Issue
12
Pages
2583-2592
ISSN
  • 0888-8809 (ISSN-L)
  • 1944-9917
OpenAlex
W2027749435
Cited by
113
References
41
Citations by year
2024: 2 · 2023: 2 · 2022: 4 · 2021: 2 · 2020: 1 · 2019: 5 · 2018: 1 · 2017: 4 · 2016: 4 · 2015: 5 · 2014: 6 · 2013: 2 · 2012: 5
FWCI
3.35
Type
journal article
Language
en
Open access
Locations
  • Molecular Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • University of California, San Francisco
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK51151)
  • Department of Medicine, University of California, San Francisco
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
Keywords
glucocorticoid receptor, receptor homodimerization, DNA-binding domain, glucocorticoid response element, phenylethanolamine N-methyltransferase, gene expression regulation, promoter binding, protein-DNA interactions, protein-protein interaction, transcriptional activation, half-sites
MeSH terms
Animals, Base Sequence, Cell Line, Chlorocebus aethiops, Cloning, Molecular, Deoxyribonuclease I, Molecular Sequence Data, Phenylethanolamine N-Methyltransferase, Plasmids, Receptors, Glucocorticoid, Recombinant Proteins, Gene Expression Regulation, Enzymologic, Mutagenesis, Mutagenesis, Site-Directed, Sequence Deletion, Genes, Reporter, DNA Footprinting, Dimerization, Amino Acid Substitution, Mice, Rats

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