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• W3100018294 abstract "ABSTRACT The thiazolidinedione (TZD) pioglitazone (Pio) is an FDA-approved drug for type 2 diabetes mellitus that binds and activates the nuclear receptor peroxisome proliferator-activated receptor gamma (PPARγ). Although TZDs have potent antidiabetic effects, they also display harmful side effects that have necessitated a better understanding of their mechanisms of action. In particular, little is known about the effect of in vivo TZD metabolites on the structure and function of PPARγ. Here, we present a structure-function comparison of Pio and a major in vivo metabolite, 1-hydroxypioglitazone (PioOH). PioOH displayed a lower binding affinity and reduced potency in coregulator recruitment assays compared to Pio. To determine the structural basis of these findings, we solved an X-ray crystal structure of PioOH bound to PPARγ ligand-binding domain (LBD) and compared it to a published Pio-bound crystal structure. PioOH exhibited an altered hydrogen bonding network that could underlie its reduced affinity and potency compared to Pio. Solution-state structural analysis using NMR spectroscopy and hydrogen/deuterium exchange mass spectrometry (HDX-MS) analysis revealed that PioOH stabilizes the PPARγ activation function-2 (AF-2) coactivator binding surface better than Pio. In support of AF-2 stabilization, PioOH displayed stabilized coactivator binding in biochemical assays and better transcriptional efficacy (maximal transactivation response) in a cell-based assay that reports on the activity of the PPARγ LBD. These results, which indicate that Pio hydroxylation affects both its potency and efficacy as a PPARγ agonist, contribute to our understanding of PPARγ-binding drug metabolite interactions and may assist in future PPARγ drug design efforts." @default.
• W3100018294 created "2020-11-23" @default.
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• W3100018294 date "2018-07-27" @default.
• W3100018294 modified "2023-09-25" @default.
• W3100018294 title "Structural basis of altered potency and efficacy displayed by a major in vivo metabolite of the anti-diabetic PPARγ drug pioglitazone" @default.
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• W3100018294 doi "https://doi.org/10.1101/351346" @default.
• W3100018294 hasPublicationYear "2018" @default.
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