Cited by 94Estrogen and related hormone effectsReceptor Mechanisms and SignalingGenomics and Chromatin Dynamics

Site-directed mutagenesis of the phosphorylation sites in the mouse glucocorticoid receptor.

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Mason, S.A., Housley, P.R.·1993·Journal of Biological Chemistry

Abstract

The functional significance of receptor phosphorylation in mediating the actions of glucocorticoids remains undefined. The identification of seven phosphorylation sites in the mouse glucocorticoid receptor (Bodwell, J. E., Orti, E., Coull, J. M., Pappin, D. J. C., Smith, L. I., and Swift, F. (1991) J. Biol. Chem. 266, 7549-7555) permits a direct examination of the potential regulatory role of glucocorticoid receptor phosphorylation in transactivation. Using oligonucleotide-directed mutagenesis of the mouse glucocorticoid receptor cDNA, we have substituted alanine or aspartate for the residues phosphorylated in this ligand-dependent transcription factor. COS-1 cells were cotransfected with mutant receptor cDNA expression vectors and a reporter plasmid containing the glucocorticoid-inducible mouse mammary tumor virus promoter linked to chloramphenicol acetyltransferase in order to characterize the effect of these substitutions on receptor-mediated gene expression. Substitution of alanine or aspartate at single phosphorylation sites does not prevent receptor transactivation. Receptors containing multiple substitutions of alanine or aspartate at the major phosphorylation sites in the acidic domain elicit levels of hormone-induced reporter gene expression that are comparable to wild-type receptors. Mutant receptors substituted with alanine at the five phosphorylation sites conserved among the rat, human, and mouse receptors exhibit a 22% decrease in transcriptional activity. Receptors mutated at all seven sites display a similar modest reduction. These results demonstrate that receptor phosphorylation at these seven identified residues is not a major determinant in glucocorticoid receptor transcriptional activity at the mouse mammary tumor virus promoter.

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Crossref · 10.1016/s0021-9258(20)80568-7

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  • Multiple kinases differentially phosphorylate the GR at serine residues S203, S211 and S226, regulating GR nuclear translocation and GR-dependent gene transcription.

    “Multiple kinases have been reported to differentially phosphorylate the GR at its serine residues, S203, S211 and S226, an effect which regulates GR nuclear translocation and GR-dependent gene transcription.25, 26, 27, 28, 29”

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Authors
Mason, S. A., & Housley, P. R.
Affiliations
University of South Carolina (US)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1993-10
Volume
268
Issue
29
Pages
21501-21504
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1597897944
Cited by
94
References
42
Citations by year
2021: 1 · 2020: 1 · 2019: 2 · 2017: 1 · 2015: 1 · 2013: 1 · 2012: 1
FWCI
6.10
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01dk036905-03)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK-36905)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
Keywords
glucocorticoid receptor, receptor phosphorylation, phosphorylation sites, transcriptional activation, transcriptional activity, acidic domain, alanine substitution, aspartate substitution, mouse mammary tumor virus promoter, hormone-induced gene expression, ligand-dependent transcription factors
MeSH terms
Animals, Cell Line, Genetic Vectors, Mammary Tumor Virus, Mouse, Phosphorylation, Promoter Regions, Genetic, Receptors, Glucocorticoid, Mutagenesis, Site-Directed, DNA, Complementary, Mice

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