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Title: Probing Dominant Negative Behavior of Glucocorticoid Receptor β through a Hybrid Structural and Biochemical Approach

Journal Article · · Molecular and Cellular Biology
DOI:https://doi.org/10.1128/MCB.00453-17· OSTI ID:1435832
 [1];  [1];  [1];  [2];  [1];  [2]; ORCiD logo [1]
  1. National Inst. of Health (NIH), Research Triangle Park, NC (United States). National Inst. of Environmental Health Sciences, Genome Integrity and Structural Biology Lab.
  2. National Inst. of Health (NIH), Research Triangle Park, NC (United States). National Inst. of Environmental Health Sciences, Signal Transduction Lab.

Glucocorticoid receptor β (GRβ) is associated with glucocorticoid resistance via dominant negative regulation of GRα. To better understand how GRβ functions as a dominant negative inhibitor of GRα at a molecular level, we determined the crystal structure of the ligand binding domain of GRβ complexed with the antagonist RU-486. The structure reveals that GRβ binds RU-486 in the same ligand binding pocket as GRα, and furthermore, the unique C-terminal amino acids of GRβ are mostly disordered. Binding energy analysis suggests that these C-terminal residues of GRβ do not contribute to RU-486 binding. Intriguingly, the GRβ/RU-486 complex binds corepressor peptide with affinity similar to that of a GRα/RU-486 complex, despite the lack of helix 12. Our biophysical and biochemical analyses reveal that in the presence of RU-486, GRβ is found in a conformation that favors corepressor binding, potentially antagonizing GRα function. This study thus presents an unexpected molecular mechanism by which GRβ could repress transcription.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Institutes of Health (NIH), National Institute of Environmental Health Sciences; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
ZIA ES102645; Z01 ES043010; Z01 ES090057; W-31-109-Eng-38
OSTI ID:
1435832
Journal Information:
Molecular and Cellular Biology, Vol. 38, Issue 8; ISSN 0270-7306
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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Clinical Use and Molecular Action of Corticosteroids in the Pediatric Age journal January 2019

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