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Plasmids play critical roles in bacterial fitness and evolution of  Pseudomonas aeruginosa . Here two plasmids found in a drug-resistant  P .  aeruginosa  clinical isolate HS87 were completely sequenced. The pHS87b plasmid (11.2 kb) carries phage-related genes and function-unknown genes. Notably, pHS87b encodes an integrase and has an adjacent  tRNA   Thr  -associated attachment site. A corresponding integrated form of pHS87b at the  tRNA   Thr   locus was identified on the chromosome of  P .  aeruginosa , showing that pHS87b is able to site-specifically integrate into the 3’-end of the  tRNA   Thr   gene. The pHS87a plasmid (26.8 kb) displays a plastic structure containing a putative replication module, stability factors and a variable region. The RepA of pHS87a shows significant similarity to the replication proteins of pPT23A-family plasmids. pHS87a carries a transposon Tn 6049 , a truncated insertion sequence ΔIS 1071  and a Tn 402 -like class 1 integron which contains an  aacA4  cassette that may confer aminoglycoside resistance. Thus, pHS87b is a site-specific integrative plasmid whereas pHS87a is a plastic antibiotic resistance plasmid. The two native plasmids may promote the fitness and evolution of  P .  aeruginosa .

plos one

A Site-Specific Integrative Plasmid Found in Pseudomonas aeruginosa Clinical Isolate HS87 along with A Plasmid Carrying an Aminoglycoside-Resistant Gene