title: The role of the TATA box in the hormonal regulation of phosphoenolpyruvate carboxykinase gene expression.
abstract: In this study, we analyzed the role of the TATA box in the regulation of the phosphoenolpyruvate carboxykinase (PEPCK) gene expression by dexamethasone (DEX), retinoic acid (RA), glucagon (via cAMP) and insulin (INS). The PEPCK TATA box (TATTTAAA) was absolutely required for both basal promoter activity and hormone-mediated transactivation. However, the relative induction of PEPCK gene expression by DEX, RA and cAMP, and its repression by INS, remained unaltered despite the substitution of the PEPCK TATA box with TATA elements from the herpes simplex virus-thymidine kinase gene, gene 33 or a consensus TATA box sequence, TATAAA. The results indicate that the TATA box serves a permissive, but not defining, function in the response of the PEPCK gene to hormones, and that this function can be equally facilitated by heterologous TATA box elements.
mesh_terms: D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D015500:Chloramphenicol O-Acetyltransferase / Q000096:biosynthesis; D016384:Consensus Sequence; D000242:Cyclic AMP / Q000031:analogs & derivatives / Q000494:pharmacology / Q000502:physiology; D017931:DNA Primers; D003907:Dexamethasone / Q000494:pharmacology*; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D014644:Genetic Variation; D007328:Insulin / Q000494:pharmacology*; D007700:Kinetics; D008114:Liver Neoplasms, Experimental; D008969:Molecular Sequence Data; D010729:Phosphoenolpyruvate Carboxykinase (GTP) / Q000096:biosynthesis*; D010957:Plasmids; D051381:Rats; D011994:Recombinant Proteins / Q000096:biosynthesis; D018139:Simplexvirus / Q000201:enzymology; D016385:TATA Box; D013873:Thionucleotides / Q000494:pharmacology; D013937:Thymidine Kinase / Q000235:genetics; D015533:Transcriptional Activation / Q000187:drug effects; D014162:Transfection; D014212:Tretinoin / Q000494:pharmacology*; D014407:Tumor Cells, Cultured
chemical_list: D017931:DNA Primers; D007328:Insulin; D011994:Recombinant Proteins; D013873:Thionucleotides; C015929:8-((4-chlorophenyl)thio)cyclic-3',5'-AMP; D014212:Tretinoin; D003907:Dexamethasone; D000242:Cyclic AMP; D015500:Chloramphenicol O-Acetyltransferase; D013937:Thymidine Kinase; D010729:Phosphoenolpyruvate Carboxykinase (GTP)