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Papers In Press, published online ahead of print May 7, 2002
J. Biol. Chem, 10.1074/jbc.M201429200
Submitted on February 12, 2002
Revised on May 6, 2002
Accepted on May 7, 2002
and
) regulate phosphoenolpyrvate carboxykinase (PEPCK) gene expression
Pharmacology, University of Tennessee, Memphis, TN 38163
Corresponding Author: epark{at}utmem.edu
Thyroid hormone and cAMP stimulate transcription of the gene for phosphoenolpyruvate carboxykinase (PEPCK). CCAAT enhancer binding proteins (C/EBP
and
) are involved in multiple aspects of the nutritional, developmental and hormonal regulation of PEPCK gene expression. Previously, we have identified a thyroid hormone response element in the PEPCK promoter and demonstrated that C/EBP proteins bound to the P3(I) site are participants in the induction of PEPCK gene expression by thyroid hormone and cAMP. Here, we identify several peptide regions within the transactivation domain of C/EBP
that enhance the ability of T3 to stimulate gene transcription. We also demonstrate that several conserved amino acids in the transactivation domain of C/EBP
and C/EBP
are required for the stimulation of basal gene expression and identify amino acids within C/EBP
that participate in the cAMP induction of the PEPCK gene. Finally, we show that the CREB binding protein (CBP) enhanced the induction of PEPCK gene transcription by thyroid hormone and that CBP is associated with the PEPCK gene in vivo. Our results indicate that both C/EBP proteins and CBP participate in the regulation of PEPCK gene transcription by thyroid hormone.
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