Journal
PLASMID
Volume 59, Issue 2, Pages 111-118Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.plasmid.2007.12.002
Keywords
pseudomonas aeruginosa; FRT-lacZ fusion; fatty acid degradation
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Funding
- NCRR NIH HHS [P20 RR018727, P20 RR018727-035798, P20RR018727] Funding Source: Medline
- NIAID NIH HHS [R03 AI065852-02, R03 AI065852] Funding Source: Medline
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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-Km(R) constructs, we constructed two novel FRT-lacZ-Gm(R) 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-Gm(R) 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-Km(R) 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. (C) 2007 Elsevier Inc. All rights reserved.
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