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. 1988 Jun;170(6):2592–2598. doi: 10.1128/jb.170.6.2592-2598.1988

Construction and characterization of Pseudomonas aeruginosa protein F-deficient mutants after in vitro and in vivo insertion mutagenesis of the cloned gene.

W A Woodruff 1, R E Hancock 1
PMCID: PMC211176  PMID: 2836364

Abstract

Mutants with insertion mutations in the Pseudomonas aeruginosa protein F (oprF) gene were created in vivo by Tn1 mutagenesis of the cloned gene in Escherichia coli and in vitro by insertion of the streptomycin resistance-encoding omega fragment into the cloned gene, followed by transfer of the mutated protein F gene back to P. aeruginosa. Homologous recombination into the P. aeruginosa chromosome was driven by a bacteriophage F116L transduction method in the oprF::Tn1 mutants or Tn5-instability in the oprF::omega mutants. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis and Western immunoblotting demonstrated that the resultant oprF insertion mutants had lost protein F, whereas restriction digestion and Southern blotting experiments proved that the mutants contained a single chromosomal oprF gene with either Tn1 or omega inserted into it. It has been proposed that protein F has a role in antibiotic uptake in P. aeruginosa. Measurement of antibiotic resistance levels showed small to marginal increases in resistance, compared with that of the parent P. aeruginosa strain, to a variety of beta-lactam antibiotics. Protein F-deficient mutants had altered barrier properties as revealed by a three- to fivefold increase in the uptake of the hydrophobic fluorescent probe 1-N-phenylnaphthylamine.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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