Structural basis for specific ligation of the peroxisome proliferator-activated receptor delta.Wu, C.C., Baiga, T.J., Downes, M., La Clair, J.J., Atkins, A.R., Richard, S.B., Fan, W., Stockley-Noel, T.A., Bowman, M.E., Noel, J.P., Evans, R.M.
(2017) Proc. Natl. Acad. Sci. U.S.A. 114: E2563-E2570
- PubMed: 28320959
- DOI: 10.1073/pnas.1621513114
- Primary Citation of Related Structures:
- PubMed Abstract:
The peroxisome proliferator-activated receptor (PPAR) family comprises three subtypes: PPARα, PPARγ, and PPARδ. PPARδ transcriptionally modulates lipid metabolism and the control of energy homeostasis; therefore, PPARδ agonists are promising agents f ...
The peroxisome proliferator-activated receptor (PPAR) family comprises three subtypes: PPARα, PPARγ, and PPARδ. PPARδ transcriptionally modulates lipid metabolism and the control of energy homeostasis; therefore, PPARδ agonists are promising agents for treating a variety of metabolic disorders. In the present study, we develop a panel of rationally designed PPARδ agonists. The modular motif affords efficient syntheses using building blocks optimized for interactions with subtype-specific residues in the PPARδ ligand-binding domain (LBD). A combination of atomic-resolution protein X-ray crystallographic structures, ligand-dependent LBD stabilization assays, and cell-based transactivation measurements delineate structure-activity relationships (SARs) for PPARδ-selective targeting and structural modulation. We identify key ligand-induced conformational transitions of a conserved tryptophan side chain in the LBD that trigger reorganization of the H2'-H3 surface segment of PPARδ. The subtype-specific conservation of H2'-H3 sequences suggests that this architectural remodeling constitutes a previously unrecognized conformational switch accompanying ligand-dependent PPARδ transcriptional regulation.
Howard Hughes Medical Institute, The Salk Institute for Biological Studies, La Jolla, CA 92037.