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Int. J. Mol. Sci. 2015, 16(7), 15405-15424;

Structural and Dynamical Insight into PPARγ Antagonism: In Silico Study of the Ligand-Receptor Interactions of Non-Covalent Antagonists

Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Micar21 Ltd., 1407 Sofia, Bulgaria
Authors to whom correspondence should be addressed.
Academic Editors: Tatyana Karabencheva-Christova and Christo Z. Christov
Received: 12 May 2015 / Revised: 26 June 2015 / Accepted: 30 June 2015 / Published: 8 July 2015
(This article belongs to the Collection Proteins and Protein-Ligand Interactions)
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The structural and dynamical properties of the peroxisome proliferator-activated receptor γ (PPARγ) nuclear receptor have been broadly studied in its agonist state but little is known about the key features required for the receptor antagonistic activity. Here we report a series of molecular dynamics (MD) simulations in combination with free energy estimation of the recently discovered class of non-covalent PPARγ antagonists. Their binding modes and dynamical behavior are described in details. Two key interactions have been detected within the cavity between helices H3, H11 and the activation helix H12, as well as with H12. The strength of the ligand-amino acid residues interactions has been analyzed in relation to the specificity of the ligand dynamical and antagonistic features. According to our results, the PPARγ activation helix does not undergo dramatic conformational changes, as seen in other nuclear receptors, but rather perturbations that occur through a significant ligand-induced reshaping of the ligand-receptor and the receptor-coactivator binding pockets. The H12 residue Tyr473 and the charge clamp residue Glu471 play a central role for the receptor transformations. Our results also demonstrate that MD can be a helpful tool for the compound phenotype characterization (full agonists, partial agonists or antagonists) when insufficient experimental data are available. View Full-Text
Keywords: PPARγ; antagonism; helix 12; nuclear receptors; molecular dynamics PPARγ; antagonism; helix 12; nuclear receptors; molecular dynamics

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Fratev, F.; Tsakovska, I.; Al Sharif, M.; Mihaylova, E.; Pajeva, I. Structural and Dynamical Insight into PPARγ Antagonism: In Silico Study of the Ligand-Receptor Interactions of Non-Covalent Antagonists. Int. J. Mol. Sci. 2015, 16, 15405-15424.

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