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• W1878232800 abstract "The phospholipase C (PLC) operon of Pseudomonas aeruginosa consists of plcS, which encodes a heat-labile secreted hemolysin, and two in-phase, overlapping genes, plcR1 and plcR2, which may encode Pi-regulatory genes. A 2.8-kilobase-pair deletion mutation in this operon was constructed, and a tetracycline resistance (Tcr) cartridge replaced the deleted sequences. A deletion mutant of strain PAO1 was obtained through recombination between the flanking regions of the mutated cloned PLC operon and the homologous chromosomal regions. The deletion of the chromosomal PLC operon and its replacement by the Tcr cartridge was confirmed by Southern hybridization. The deletion strain, PLC SR, is nonhemolytic. However, it retains PLC activity when measured on a synthetic substrate. A second mutant strain, PLC R, contains a deletion in the plcR genes. This mutant is more hemolytic and produces more enzymatic activity than PAO1. The virulence of both of these mutants was compared with that of PAO1 in the mouse burn model of infection. When mice were infected with cultures grown in a high-Pi medium, there was a 10-fold increase in the 50% lethal dose of the mutants compared with PAO1. In contrast, when the inoculum originated from low-Pi cultures, there was a 200- to 10,000-fold increase in the 50% lethal dose of the mutants over PAO1." @default.
• W1878232800 created "2016-06-24" @default.
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• W1878232800 date "1989-05-01" @default.
• W1878232800 modified "2023-10-14" @default.
• W1878232800 title "Mutations in the hemolytic-phospholipase C operon result in decreased virulence of Pseudomonas aeruginosa PAO1 grown under phosphate-limiting conditions" @default.
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• W1878232800 doi "https://doi.org/10.1128/iai.57.5.1369-1373.1989" @default.
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