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2015 ; 29
(5
): 421-39
Nephropedia Template TP
Lewis SN
; Garcia Z
; Hontecillas R
; Bassaganya-Riera J
; Bevan DR
J Comput Aided Mol Des
2015[May]; 29
(5
): 421-39
PMID25616366
show ga
Peroxisome proliferator-activated receptor-gamma (PPAR?) is a nuclear hormone
receptor involved in regulating various metabolic and immune processes. The PPAR
family of receptors possesses a large binding cavity that imparts promiscuity of
ligand binding not common to other nuclear receptors. This feature increases the
challenge of using computational methods to identify PPAR ligands that will dock
favorably into a structural model. Utilizing both ligand- and structure-based
pharmacophore methods, we sought to improve agonist prediction by grouping
ligands according to pharmacophore features, and pairing models derived from
these features with receptor structures for docking. For 22 of the 33 receptor
structures evaluated we observed an increase in true positive rate (TPR) when
screening was restricted to compounds sharing molecular features found in
rosiglitazone. A combination of structure models used for docking resulted in a
higher TPR (40 %) when compared to docking with a single structure model (<20 %).
Prediction was also improved when specific protein-ligand interactions between
the docked ligands and structure models were given greater weight than the
calculated free energy of binding. A large-scale screen of compounds using a
marketed drug database verified the predictive ability of the selected structure
models. This study highlights the steps necessary to improve screening for PPAR?
ligands using multiple structure models, ligand-based pharmacophore data,
evaluation of protein-ligand interactions, and comparison of docking datasets.
The unique combination of methods presented here holds potential for more
efficient screening of compounds with unknown affinity for PPAR? that could serve
as candidates for therapeutic development.