7E2O image
Entry Detail
PDB ID:
7E2O
Keywords:
Title:
X-ray Crystal structure of PPARgamma R288H mutant.
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2021-02-06
Release Date:
2022-01-19
Method Details:
Experimental Method:
Resolution:
3.20 Å
R-Value Free:
0.31
R-Value Work:
0.23
R-Value Observed:
0.23
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Peroxisome proliferator-activated receptor gamma
Mutations:R288H
Chain IDs:A, B
Chain Length:276
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Structural Insights into the Loss-of-Function R288H Mutant of Human PPAR gamma.
Biol.Pharm.Bull. 44 1196 1201 (2021)
PMID: 34471047 DOI: 10.1248/bpb.b21-00253

Abstact

Peroxisome proliferator-activated receptor gamma (PPARγ) is a nuclear receptor and the molecular target of thiazolidinedione-class antidiabetic drugs. It has been reported that the loss of function R288H mutation in the human PPARγ ligand-binding domain (LBD) may be associated with the onset of colon cancer. A previous in vitro study showed that this mutation dampens 15-deoxy-Δ12,14-prostaglandin J2 (15d-PGJ2, a natural PPARγ agonist)-dependent transcriptional activation; however, it is poorly understood why the function of the R288H mutant is impaired and what role this arginine (Arg) residue plays. In this study, we found that the apo-form of R288H PPARγ mutant displays several altered conformational arrangements of the amino acid side chains in LBD: 1) the loss of a salt bridge between Arg288 and Glu295 leads to increased helix 3 movement; 2) closer proximity of Gln286 and His449 via a hydrogen bond, and closer proximity of Cys285 and Phe363 via hydrophobic interaction, stabilize the helix 3-helix 11 interaction; and 3) there is steric hindrance between Cys285/Gln286/Ser289/His449 and the flexible ligands 15d-PGJ2, 6-oxotetracosahexaenoic acid (6-oxoTHA), and 17-oxodocosahexaenoic acid (17-oxoDHA). These results suggest why Arg288 plays an important role in ligand binding and why the R288H mutation is disadvantageous for flexible ligand binding.

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