1887

Abstract

Two conjugative plasmids (CPs) were isolated and characterized from the same ‘’ strain, SOG2/4. The plasmids were separated from each other and transferred into . One has a high copy number and is not stable (pSOG1) whereas the other has a low copy number and is stably maintained (pSOG2). Plasmid pSOG2 is the first CP found to have these characteristics. The genomes of both pSOG plasmids have been sequenced and were compared to each other and the available CPs. Interestingly, apart from a very well-conserved core, 70 % of the pSOG1 and pSOG2 genomes is largely different and composed of a mixture of genes that often resemble counterparts in previously described CPs. However, about 20 % of the predicted genes do not have known homologues, not even in other CPs. Unlike pSOG1, pSOG2 does not contain a gene for the highly conserved PlrA protein nor for obvious homologues of partitioning proteins. Unlike pNOB8 and pKEF9, both pSOG plasmids lack the so-called clustered regularly interspaced short palindrome repeats (CRISPRs). The sites of recombination between the two genomes can be explained by the presence of recombination motifs previously identified in other CPs. Like other CPs, the pSOG plasmids possess a gene encoding an integrase of the tyrosine recombinase family. This integrase probably mediates plasmid site-specific integration into the host chromosome at the highly conserved tRNA loci.

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2006-07-01
2024-03-28
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