July 7, 2019  |  

A carbapenem-resistant Pseudomonas aeruginosa isolate harboring two copies of blaIMP-34 encoding a metallo-ß-lactamase.

Authors: Tada, Tatsuya and Miyoshi-Akiyama, Tohru and Shimada, Kayo and Shiroma, Akino and Nakano, Kazuma and Teruya, Kuniko and Satou, Kazuhito and Hirano, Takashi and Shimojima, Masahiro and Kirikae, Teruo

A carbapenem-resistant strain of Pseudomonas aeruginosa, NCGM1984, was isolated in 2012 from a hospitalized patient in Japan. Immunochromatographic assay showed that the isolate was positive for IMP-type metallo-ß-lactamase. Complete genome sequencing revealed that NCGM1984 harbored two copies of blaIMP-34, located at different sites on the chromosome. Each blaIMP-34 was present in the same structures of the class 1 integrons, tnpA(ISPa7)-intI1-qacG-blaIMP-34-aac(6')-Ib-qacEdelta1-sul1-orf5-tniBdelta-tniA. The isolate belonged to multilocus sequence typing ST235, one of the international high-risk clones. IMP-34, with an amino acid substitution (Glu126Gly) compared with IMP-1, hydrolyzed all ß-lactamases tested except aztreonam, and its catalytic activities were similar to IMP-1. This is the first report of a clinical isolate of an IMP-34-producing P. aeruginosa harboring two copies of blaIMP-34 on its chromosome.

Journal: PloS one
DOI: 10.1371/journal.pone.0149385
Year: 2016

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