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Molecular and Cellular Biology, March 2000, p. 1868-1876, Vol. 20, No. 5
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

The Coactivator PGC-1 Cooperates with Peroxisome Proliferator-Activated Receptor alpha  in Transcriptional Control of Nuclear Genes Encoding Mitochondrial Fatty Acid Oxidation Enzymes

Rick B. Vega,1 Janice M. Huss,1 and Daniel P. Kelly1,2,*

Center for Cardiovascular Research, Departments of Medicine1 and Molecular Biology and Pharmacology,2 Washington University School of Medicine, St. Louis, Missouri

Received 9 August 1999/Returned for modification 22 September 1999/Accepted 10 December 1999

Peroxisome proliferator-activated receptor alpha  (PPARalpha ) plays a key role in the transcriptional control of genes encoding mitochondrial fatty acid beta -oxidation (FAO) enzymes. In this study we sought to determine whether the recently identified PPAR gamma coactivator 1 (PGC-1) is capable of coactivating PPARalpha in the transcriptional control of genes encoding FAO enzymes. Mammalian cell cotransfection experiments demonstrated that PGC-1 enhanced PPARalpha -mediated transcriptional activation of reporter plasmids containing PPARalpha target elements. PGC-1 also enhanced the transactivation activity of a PPARalpha -Gal4 DNA binding domain fusion protein. Retroviral vector-mediated expression studies performed in 3T3-L1 cells demonstrated that PPARalpha and PGC-1 cooperatively induced the expression of PPARalpha target genes and increased cellular palmitate oxidation rates. Glutathione S-transferase "pulldown" studies revealed that in contrast to the previously reported ligand-independent interaction with PPARgamma , PGC-1 binds PPARalpha in a ligand-influenced manner. Protein-protein interaction studies and mammalian cell hybrid experiments demonstrated that the PGC-1-PPARalpha interaction involves an LXXLL domain in PGC-1 and the PPARalpha AF2 region, consistent with the observed ligand influence. Last, the PGC-1 transactivation domain was mapped to within the NH2-terminal 120 amino acids of the PGC-1 molecule, a region distinct from the PPARalpha interacting domains. These results identify PGC-1 as a coactivator of PPARalpha in the transcriptional control of mitochondrial FAO capacity, define separable PPARalpha interaction and transactivation domains within the PGC-1 molecule, and demonstrate that certain features of the PPARalpha -PGC-1 interaction are distinct from that of PPARgamma -PGC-1.


* Corresponding author. Mailing address: Center for Cardiovascular Research, Washington University School of Medicine, 660 S. Euclid Ave., Campus Box 8086, St. Louis, MO 63110. Phone: (314) 362-8908. Fax: (314) 362-0186. E-mail: dkelly{at}imgate.wustl.edu.


Molecular and Cellular Biology, March 2000, p. 1868-1876, Vol. 20, No. 5
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.



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