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Sequence Analysis of the Mobile Genome Island pKLC102 of Pseudomonas aeruginosa C

Klinische Forschergruppe, OE 6710, Medizinische Hochschule Hannover, D-30625 Hannover, Germany

Received 24 July 2003/ Accepted 19 October 2003

The Pseudomonas aeruginosa plasmid pKLC102 coexists as a plasmid and a genome island in clone C strains. Whereas the related plasmid pKLK106 reversibly recombines with P. aeruginosa clone K chromosomes at one of the two tRNA^Lys genes, pKLC102 is incorporated into the tRNA^Lys gene only close to the pilA locus. Targeting of the other tRNA^Lys copy in the chromosome is blocked by a 23,395-bp mosaic of truncated PAO open reading frames, transposons, and pKLC102 homologs. Annotation and phylogenetic analysis of the large 103,532-bp pKLC102 sequence revealed that pKLC102 is a hybrid of plasmid and phage origin. The plasmid lineage conferred oriV and genes for replication, partitioning, and conjugation, including a pil cluster encoding type IV thin sex pili and an 8,524-bp chvB glucan synthetase gene that is known to be a major determinant for host tropism and virulence. The phage lineage conferred integrase, att, and a syntenic set of conserved hypothetical genes also observed in the tRNA^Gly-associated genome islands of P. aeruginosa clone C chromosomes. In subgroup C isolates from patients with cystic fibrosis, pKLC102 was irreversibly fixed into the chromosome by the insertion of the large 23,061-bp class I transposon TNCP23, which is a composite of plasmid, integron, and IS6100 elements. Intramolecular transposition of a copy of IS6100 led to chromosomal inversions and disruption of plasmid synteny. The case of pKLC102 in P. aeruginosa clone C documents the intraclonal evolution of a genome island from a mobile ancestor via a reversibly integrated state to irreversible incorporation and dissipation in the chromosome.

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