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  • Examination of Ligand-Dependent Coactivator Recruitment by Peroxisome Proliferator-Activated Receptor-alpha (PPARalpha).

    PPAR Res. 2006:69612. doi: 10.1155/PPAR/2006/69612. 2006. View on PubMed.
  • Authors

    Tien ES, Hannon DB, Thompson JT, and Vanden Heuvel JP
  • Abstract

    The ligand-dependent recruitment of coactivators to peroxisome proliferator-activated receptor-alpha (PPARalpha) was examined. PPAR-binding protein (PBP), PPARgamma coactivator-1alpha (PGC-1alpha), steroid receptor coactivator-1 (SRC-1), and CBP/p300-interacting transactivator with ED-rich tail 2 (CITED2) affected PPARalpha activity in the presence of Wy-14,643. The effects on PPARalpha activity in light of increased or decreased expression of these coactivators were qualitatively different depending on the ligand examined. Diminished expression of PGC-1alpha, SRC-1, or PBP by RNAi plasmids affected natural or synthetic agonist activity whereas only Wy-14,643 was affected by decreased PGC-1alpha. The interaction of PPARalpha with an LXXLL-containing peptide library showed ligand-specific patterns, indicative of differences in conformational change. The association of coactivators to PPARalpha occurs predominantly via the carboxyl-terminus and mutating (456)LHPLL to (456)LHPAA resulted in a dominant-negative construct. This research confirms that coactivator recruitment to PPARalpha is ligand-dependent and that selective receptor modulators (SRMs) of this important protein are likely.

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