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• W1570179944 endingPage "7068" @default.
• W1570179944 startingPage "7059" @default.
• W1570179944 abstract "The tolQ, tolR, and tolA genes from Pseudomonas aeruginosa PAO were cloned using degenerate oligonucleotide PCR primers designed based on conserved transmembrane regions of Escherichia coli TolQ and TolR and E. coli and Pseudomonas putida ExbB and ExbD. The resulting PCR product was used as a probe to isolate a 6.5-kb DNA fragment containing P. aeruginosa tolQ, tolR, and tolA. The nucleotide sequence of a 2.9-kb DNA fragment containing the tolQ, tolR, and tolA genes was determined. The DNA sequence predicts TolQ to be a 25,250-Da protein exhibiting 53% identity to E. coli TolQ. TolR is predicted to be a 15,788-Da protein, sharing 38% identity with the E. coli TolR protein. The P. aeruginosa tolA sequence predicts a 37,813-Da protein with 27% identity to the E. coli TolA. The P. aeruginosa TolQRA proteins were expressed in E. coli minicells. Analysis of plasmid-encoded tolQ::lacZ and tolA::lacZ promoter fusions in E. coli indicated that these genes are expressed at different levels, suggesting transcription from different promoters. Transcriptional analysis of the tol genes in P. aeruginosa revealed that the tolQ and tolR genes are cotranscribed as an approximately 1.5-kb transcript and that tolA is transcribed from its own promoter as an approximately 1.2-kb transcript. The P. aeruginosa Tol proteins were functionally unable to complement E. coli tol mutants, although P. aeruginosa TolQ was able to complement the iron-limited growth of an E. coli exbB mutant. Introduction of the tolQRA genes in the tol-like mutant PAO 1652 restored pyocin AR41 killing, indicating that the Tol proteins are involved in the uptake of pyocin AR41 in P. aeruginosa. Attempts to inactivate the chromosomal copy of the tolA or tolQ gene in the parent strain PAO proved to be unsuccessful, and we propose that inactivation of these genes in P. aeruginosa results in a lethal phenotype." @default.
• W1570179944 created "2016-06-24" @default.
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• W1570179944 date "1996-12-01" @default.
• W1570179944 modified "2023-10-18" @default.
• W1570179944 title "Identification and characterization of the tolQRA genes of Pseudomonas aeruginosa" @default.
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• W1570179944 doi "https://doi.org/10.1128/jb.178.24.7059-7068.1996" @default.
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