title: Engineering of FRT-lacZ fusion constructs: induction of the Pseudomonas aeruginosa fadAB1 operon by medium and long chain-length fatty acids.
abstract: Without prior knowledge of the promoters of various genes in bacteria, it can be difficult to study gene regulation using reporter-gene fusions. Regulation studies of promoters are ideal at their native locus, which do not require prior knowledge of promoter regions. Based on a previous study with FRT-lacZ-KmR constructs, we constructed two novel FRT-lacZ-GmR plasmids. This allows easy engineering of Pseudomonas aeruginosa reporter-gene fusions, post-mutant construction, with the Flp-FRT system. We demonstrate the usefulness of one of these FRT-lacZ-GmR plasmids to study the regulation of the fadAB1 operon in P. aeruginosa at its native locus. The fadAB1 operon, involved in fatty acid (FA) degradation, was significantly induced in the presence of several medium chain-length fatty acids (MCFA) and, to a lesser degree, long chain-length fatty acids (LCFA). In addition to the previous work on the FRT-lacZ-KmR tools, these new constructs increase the repertoire of tools that can be applied to P. aeruginosa or other species and strains of bacteria where kanamycin resistance may not be appropriate.
authors.affiliation: Department of Microbiology, College of Natural Sciences, University of Hawaii at Manoa, 2538 McCarthy Mall, Snyder 310, Honolulu, HI 96822, USA.
authors.forename: Mike S
authors.initials: MS
authors.lastname: Son
authors.forename: David T
authors.initials: DT
authors.lastname: Nguyen
authors.forename: Yun
authors.initials: Y
authors.lastname: Kang
authors.forename: Tung T
authors.initials: TT
authors.lastname: Hoang
mesh_terms: D001483:Base Sequence; D002876:Chromosomes, Bacterial / Q000378:metabolism; D005227:Fatty Acids / Q000494:pharmacology*; D015964:Gene Expression Regulation, Bacterial / Q000187:drug effects*; D005818:Genetic Engineering / Q000379:methods*; D005947:Glucose / Q000494:pharmacology; D009876:Operon / Q000235:genetics*; D010957:Plasmids / Q000378:metabolism; D011550:Pseudomonas aeruginosa / Q000187:drug effects* / Q000235:genetics* / Q000254:growth & development; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D001616:beta-Galactosidase / Q000378:metabolism*
chemical_list: D005227:Fatty Acids; D011993:Recombinant Fusion Proteins; D001616:beta-Galactosidase; D005947:Glucose