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SUMOylation of human peroxisome proliferator-activated receptor alpha inhibits its trans-activity through the recruitment of the nuclear corepressor NCoR.

J Biol Chem. 2010 Feb 26;285(9):5983-92. Epub 2009 Dec 02
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摘要


The nuclear receptor peroxisome proliferator-activated receptor alpha (PPARalpha) is a key regulator of genes implicated in lipid homeostasis and inflammation. PPARalpha trans-activity is enhanced by recruitment of coactivators such as SRC1 and CBP/p300 and is inhibited by binding of corepressors such as NCoR and SMRT. In addition to ligand binding, PPARalpha activity is regulated by post-translational modifications such as phosphorylation and ubiquitination. In this report, we demonstrate that hPPARalpha is SUMOylated by SUMO-1 on lysine 185 in the hinge region. The E2-conjugating enzyme Ubc9 and the SUMO E3- ligase PIASy are implicated in this process. In addition, ligand treatment decreases the SUMOylation rate of hPPARalpha. Finally, our results demonstrate that SUMO-1 modification of hPPARalpha down-regulates its trans-activity through the specific recruitment of corepressor NCoR but not SMRT leading to the differential expression of a subset of PPARalpha target genes. In conclusion, hPPARalpha SUMOylation on lysine 185 down-regulates its trans-activity through the selective recruitment of NCoR.

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