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• W1574663713 endingPage "5358" @default.
• W1574663713 startingPage "5350" @default.
• W1574663713 abstract "Mutants of IncFII plasmid NR1 that have transposons inserted in the repA4 open reading frame (ORF) are not inherited stably. The repA4 ORF is located immediately downstream from the replication origin (ori). The repA4 coding region contains inverted-repeat sequences that are homologous to the terC inverted repeats located in the replication terminus of the Escherichia coli chromosome. The site of initiation of leading-strand synthesis for replication of NR1 is also located in repA4 near its 3' end. Transposon insertions between ori and the right-hand terC repeat resulted in plasmid instability, whereas transposon insertions farther downstream did not. Derivatives that contained a 35-bp frameshift insertion in the repA4 ORF were all stable, even when the frameshift was located very near the 5' end of the coding region. This finding indicates that repA4 does not specify a protein product that is essential for plasmid stability. Examination of mutants having a nest of deletions with endpoints in or near repA4 indicated that the 3' end of the repA4 coding region and the site of leading-strand initiation could be deleted without appreciable effect on plasmid stability. Deletion of the pemI and pemK genes, located farther downstream from repA4 and reported to affect plasmid stability, also had no detectable effect. In contrast, mutants from which the right-hand terC repeat, or both right- and left-hand repeats, had been deleted were unstable. None of the insertion or deletion mutations in or near repA4 affected plasmid copy number. Alteration of the terC repeats by site-directed mutagenesis had little effect on plasmid stability. Plasmid stability was not affected by a fus mutation known to inactivate the termination function. Therefore, it appears that the overall integrity of the repA4 region is more important for stable maintenance of plasmid NR1 than are any of the individual known features found in this region." @default.
• W1574663713 created "2016-06-24" @default.
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• W1574663713 date "1993-09-01" @default.
• W1574663713 modified "2023-10-18" @default.
• W1574663713 title "Insertion and deletion mutations in the repA4 region of the IncFII plasmid NR1 cause unstable inheritance" @default.
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• W1574663713 doi "https://doi.org/10.1128/jb.175.17.5350-5358.1993" @default.
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