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Synergistic Regulation of Coregulator/Nuclear Receptor Interaction by Ligand and DNA.


ABSTRACT: Nuclear receptor (NR) transcription factors bind various coreceptors, small-molecule ligands, DNA response element sequences, and transcriptional coregulator proteins to affect gene transcription. Small-molecule ligands and DNA are known to influence receptor structure, coregulator protein interaction, and function; however, little is known on the mechanism of synergy between ligand and DNA. Using quantitative biochemical, biophysical, and solution structural methods, including 13C-detected nuclear magnetic resonance and hydrogen/deuterium exchange (HDX) mass spectrometry, we show that ligand and DNA cooperatively recruit the intrinsically disordered steroid receptor coactivator-2 (SRC-2/TIF2/GRIP1/NCoA-2) receptor interaction domain to peroxisome proliferator-activated receptor gamma-retinoid X receptor alpha (PPAR?-RXR?) heterodimer and reveal the binding determinants of the complex. Our data reveal a thermodynamic mechanism by which DNA binding propagates a conformational change in PPAR?-RXR?, stabilizes the receptor ligand binding domain dimer interface, and impacts ligand potency and cooperativity in NR coactivator recruitment.

SUBMITTER: de Vera IMS 

PROVIDER: S-EPMC5653230 | BioStudies | 2017-01-01

REPOSITORIES: biostudies

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