title: Differential expression of CYP102 in Bacillus megaterium by 17-beta-estradiol and 4-sec-butylphenol.
abstract: Previously we have reported the induction of CYP102 in Bacillus megaterium by 17beta-estradiol (E2) and 4-sec-butylphenol (4-sBP). Electrophoretic mobility shift assay analyses demonstrated that E2 and 4-sBP both cause a dose-dependent disassociation of the Bm3R1 repressor protein from its binding site on the operator sequence of the CYP102 gene. Equimolar combinations of E2 and 4-sBP demonstrated additive induction of CYP102 compared to equivalent samples of E2 and 4-sBP added alone. Two gene constructs were used in this investigation. One construct designated BMC143 contained the entire regulatory region of CYP102. The other gene construct, designated BMA45, had the "Barbie box" sequence deleted. While the induction of CYP102 by 4-sBP was much higher in the BMC 143 construct, E2 induced CYP102 in both constructs to the same extent. This difference in induction of CYP102 by these two inducers indicates that they act at different sites, either on the Bm3R1 repressor protein or on positive regulatory sites, or that they act, in part, through different mechanisms.
authors.affiliation: Department of Chemistry, Tulane University, New Orleans, LA 70118, USA.
authors.forename: Christopher W
authors.initials: CW
authors.lastname: Rowley
authors.forename: Rajendram V
authors.initials: RV
authors.lastname: Rajnarayanan
authors.forename: Nancy E
authors.initials: NE
authors.lastname: Hopkins
authors.forename: William L
authors.initials: WL
authors.lastname: Alworth
mesh_terms: D001410:Bacillus megaterium / Q000201:enzymology* / Q000235:genetics*; D001426:Bacterial Proteins / Q000096:biosynthesis / Q000235:genetics*; D001665:Binding Sites; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis / Q000235:genetics*; D004790:Enzyme Induction / Q000187:drug effects; D004958:Estradiol / Q000494:pharmacology; D015870:Gene Expression / Q000187:drug effects; D005798:Genes, Bacterial; D006899:Mixed Function Oxygenases / Q000096:biosynthesis / Q000235:genetics*; D009251:NADPH-Ferrihemoprotein Reductase; D010636:Phenols / Q000494:pharmacology
chemical_list: D001426:Bacterial Proteins; D010636:Phenols; D004958:Estradiol; D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D009251:NADPH-Ferrihemoprotein Reductase; C052423:flavocytochrome P450 BM3 monoxygenases