X-ray crystal structure of rivoglitazone bound to PPARγ and PPAR subtype selectivity of TZDs

May 14, 2017Biochimica et biophysica acta. General subjects

Detailed 3D structure of rivoglitazone with PPARγ and how TZD drugs selectively bind PPAR types

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Abstract

The first X-ray crystal structure of rivoglitazone bound to a PPAR receptor is reported.

Thiazolidinedione compounds target the PPARγ receptor and may help treat insulin resistance and type II diabetes.
Rivoglitazone is identified as the most potent TZD among rosiglitazone and pioglitazone.
TZDs also interact with PPARα and PPARδ, leading to potential off-target effects due to their marginal selectivity.
Key interactions that influence TZD receptor selectivity involve specific residues in PPARα and PPARδ.
Rivoglitazone establishes a unique hydrogen bond network with the PPARγ co-activator binding surface and shows more extensive interactions with certain receptor regions compared to rosiglitazone.

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Thiazolidinedione (TZD) compounds targeting the nuclear receptor peroxisome proliferator-activated receptor gamma (PPARγ) demonstrate unique benefits for the treatment of insulin resistance and type II diabetes. TZDs include rosiglitazone, pioglitazone and rivoglitazone, with the latter being the most potent. The TZDs are only marginally selective for the therapeutic target PPARγ as they also activate PPARα and PPARδ homologues to varying degrees, causing off-target effects. While crystal structures for TZD compounds in complex with PPARγ are available, minimal structural information is available for TZDs bound to PPARα and PPARδ. This paucity of structural information has hampered the determination of precise structural mechanisms involved in TZD selectivity between PPARs. To help address these questions molecular dynamic simulations were performed of rosiglitazone, pioglitazone and rivoglitazone in complex with PPARα, PPARδ, and PPARγ in order to better understand the mechanisms of PPAR selectivity. The simulations revealed that TZD interactions with residues Tyr314 and Phe318 of PPARα and residues Phe291 and Thr253 of PPARδ as well as the omega loop, are key determinants of TZD receptor selectivity. Notably, in this study, we solve the first X-ray crystal structure of rivoglitazone bound to any PPAR. Rivoglitazone forms a unique hydrogen bond network with the residues of the PPARγ co-activator binding surface (known as AF2) and makes more extensive contacts with helix 3 and the β-sheet as compared to model TZD compounds such as rosiglitazone.

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X-ray crystal structure of rivoglitazone bound to PPARγ and PPAR subtype selectivity of TZDs

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