6NWK

Structure of the Ancestral Glucocorticoid Receptor 2 ligand binding domain in complex with dexamethasone and PGC1a coregulator fragment

Summary for 6NWK

• Entry DOI: 10.2210/pdb6nwk/pdb
• Descriptor: glucocorticoid receptor, Peroxisome proliferator-activated receptor gamma coactivator 1-alpha, DEXAMETHASONE, ... (8 entities in total)
• Functional Keywords: glucocorticoid receptor; agonist; coactivator, hormone
• Biological source: Homo sapiens; More
• Total number of polymer chains: 2
• Total formula weight: 30775.07

Authors

Liu, X.,Ortlund, E.A. (deposition date: 2019-02-06, release date: 2019-10-23, Last modification date: 2023-10-11)

Primary citation

Liu, X.,Wang, Y.,Ortlund, E.A.
First High-Resolution Crystal Structures of the Glucocorticoid Receptor Ligand-Binding Domain-Peroxisome Proliferator-ActivatedgammaCoactivator 1-alphaComplex with Endogenous and Synthetic Glucocorticoids.
Mol.Pharmacol., 96:408-417, 2019

PubMed Abstract: Both synthetic and endogenous glucocorticoids are important pharmaceutic drugs known to bind to the ligand-binding domain (LBD) of glucocorticoid receptor (GR), a member of the nuclear receptor (NR) superfamily. Ligand binding induces conformational changes within GR, resulting in subsequent DNA binding and differential coregulator recruitment, ultimately activating or repressing target gene expression. One of the most crucial coregulators is peroxisome proliferator-activated coactivator 1- (PGC1), which acts to regulate energy metabolism by directly interacting with GR to modulate gene expression. However, the mechanisms through which PGC1 senses GR conformation to drive transcription are not completely known. Here, an ancestral variant of the GR (AncGR2) LBD was used as a tool to produce stable protein for biochemical and structural studies. PGC1 is found to interact more tightly and form a more stable complex with AncGR2 LBD than nuclear receptor coactivator 2. We report the first high-resolution X-ray crystal structures of AncGR2 LBD in complex with PGC1 and dexamethasone (DEX) or hydrocortisone (HCY). Structural analyses reveal how distinct steroid drugs bind to GR with different affinities by unique hydrogen bonds and hydrophobic interactions. Important charge clamps are formed between the activation function 2 and PGC1 to mediate their specific interactions. These interactions lead to a high level of protection from hydrogen-deuterium exchange at the coregulator interaction site and strong intramolecular allosteric communication to ligand binding site. This is the first structure detailing the GR-PGC1 interaction providing a foundation for future design of specific therapeutic agents targeting these critical metabolic regulators. SIGNIFICANCE STATEMENT: High-resolution structures of AncGR2 LBD bound to DEX and HCY in complex with PGC1α reveal the molecular mechanism of PGC1α binding to AncGR2 LBD as well as the distinct affinities between DEX and HCY binding. Identifying the structural mechanisms that drive drug affinity is of pharmacologic interest to the glucocorticoid receptor field as an avenue to guide future drug design targeting GR-PGC1α signaling, which plays a crucial role in controlling hepatic glucose output.

PubMed: 31391291
DOI: 10.1124/mol.119.116806

Experimental method

X-RAY DIFFRACTION (1.65 Å)