Identification of nuclear receptor corepressor as a peroxisome proliferator-activated receptor alpha interacting protein.
Nuclear receptor corepressor (NCoR) was demonstrated to interact strongly with peroxisome proliferator-activated receptor alpha (PPARalpha), and PPARalpha ligands suppressed this interaction. In contrast to the interaction of PPARalpha with the coactivator protein, p300, association of the receptor with NCoR did not require any part of the PPARalpha ligand binding domain. NCoR was found to suppress PPARalpha-dependent transcriptional activation in the context of a PPARalpha.retinoid X receptor alpha (RXRalpha) heterodimeric complex bound to a peroxisome proliferator-responsive element in human embryonic kidney 293 cells. This repression was reversed agonists of either receptor demonstrating a functional interaction between NCoR and PPARalpha.RXRalpha heterodimeric complexes in mammalian cells. NCoR appears to influence PPARalpha signaling pathways and, therefore, may modulate tissue responsiveness to peroxisome proliferators.
Dowell
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Program in Molecular and Cellular Biology, College of Pharmacy, Oregon State University, Corvallis, Oregon 97331, USA.
Ishmael
J E
JE
Avram
D
D
Peterson
V J
VJ
Nevrivy
D J
DJ
Leid
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M
D000595:Amino Acid Sequence; D002478:Cells, Cultured; D003001:Cloning, Molecular; D019281:Dimerization; D006801:Humans; D008024:Ligands; D008830:Microbodies / Q000378:metabolism*; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics; D009687:Nuclear Proteins / Q000378:metabolism*; D056971:Nuclear Receptor Co-Repressor 1; D018160:Receptors, Cytoplasmic and Nuclear / Q000235:genetics / Q000378:metabolism*; D018168:Receptors, Retinoic Acid / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism*; D047488:Retinoid X Receptors; D015398:Signal Transduction / Q000235:genetics; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D015533:Transcriptional Activation / Q000235:genetics; D014162:Transfection / Q000235:genetics; D015003:Yeasts / Q000235:genetics; D000097768:Retinoic Acid Receptor gamma
D008024:Ligands; D009687:Nuclear Proteins; D056971:Nuclear Receptor Co-Repressor 1; D018160:Receptors, Cytoplasmic and Nuclear; D018168:Receptors, Retinoic Acid; D012097:Repressor Proteins; D047488:Retinoid X Receptors; D014157:Transcription Factors; D000097768:Retinoic Acid Receptor gamma; C539127:NCOR1 protein, human