title: Quantitative and kinetic study of oxidative stress regulons using green fluorescent protein.
abstract: Potentially damaging reactive oxygen species (ROS) are involved in a number of pathways ranging from signal transduction to apoptosis. Cells have adapted this alteration in redox status into a complex regulatory mechanism. ROS are specifically able to induce the expression of a multitude of genes. We constructed and characterized "oxidative stress probes" consisting of promoter fusions of several ROS-induced genes and the green fluorescent protein (GFP) reporter gene. Specifically, the sodA, fumC, zwf, acnA, acrAB, and soxS genes from the SoxRS regulon and the katG and ahpC genes from OxyR regulon, which respond to the superoxide anion and hydrogen peroxide, were studied. Our results revealed not only different levels of background transcription, but different induction levels both in terms of timing and strength. These systematic studies were performed under a uniform parallel platform and have provided insight into the complicated gene regulation of the oxidative stress regulons.
authors.affiliation: Department of Chemical and Biochemical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21250, USA.
authors.forename: Canghai
authors.initials: C
authors.lastname: Lu
authors.forename: C Renee
authors.initials: CR
authors.lastname: Albano
authors.forename: William E
authors.initials: WE
authors.lastname: Bentley
authors.forename: Govind
authors.initials: G
authors.lastname: Rao
mesh_terms: D000667:Ampicillin / Q000633:toxicity; D017931:DNA Primers; D015342:DNA Probes; D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics* / Q000378:metabolism*; D015870:Gene Expression; D005798:Genes, Bacterial; D049452:Green Fluorescent Proteins / Q000378:metabolism*; D006861:Hydrogen Peroxide / Q000633:toxicity; D007700:Kinetics; D010084:Oxidation-Reduction; D018384:Oxidative Stress / Q000235:genetics*; D010269:Paraquat / Q000633:toxicity; D010957:Plasmids; D016133:Polymerase Chain Reaction; D018085:Regulon
chemical_list: D017931:DNA Primers; D015342:DNA Probes; D049452:Green Fluorescent Proteins; D000667:Ampicillin; D006861:Hydrogen Peroxide; D010269:Paraquat