Coproduction of novel 16S rRNA methylase RmtD and metallo-beta-lactamase SPM-1 in a panresistant Pseudomonas aeruginosa isolate from Brazil.

Article Details

Citation

Copy to clipboard

Doi Y, de Oliveira Garcia D, Adams J, Paterson DL

Coproduction of novel 16S rRNA methylase RmtD and metallo-beta-lactamase SPM-1 in a panresistant Pseudomonas aeruginosa isolate from Brazil.

Antimicrob Agents Chemother. 2007 Mar;51(3):852-6. Epub 2006 Dec 11.

PubMed ID

17158944 [ View in PubMed

]

Abstract

Serious infections with Pseudomonas aeruginosa are frequently treated with the combination of a beta-lactam antimicrobial and an aminoglycoside. P. aeruginosa strain PA0905 was isolated in 2005 from an inpatient in Brazil. It showed a panresistant phenotype that included resistance to beta-lactams, aminoglycosides, and fluoroquinolones. The beta-lactam resistance was conferred by the production of the metallo-beta-lactamase SPM-1. No inhibitory zone was observed when a disk diffusion test was performed with the semisynthetic aminoglycoside arbekacin, raising suspicion of 16S rRNA methylase production. A cloning experiment subsequently revealed the presence of a novel 16S rRNA methylase, RmtD, which accounted for the high-level resistance to all 4,6-disubstituted deoxystreptamine aminoglycosides, such as amikacin, tobramycin, and gentamicin. RmtD shared a moderate degree of identity with RmtA, another 16S rRNA methylase that was initially reported to occur in P. aeruginosa in Japan in 2003. This is the first identification of aminoglycoside resistance mediated by a 16S rRNA methylase in South America. This is also the first report to document coproduction of a metallo-beta-lactamase and a 16S rRNA methylase, a combination that would severely compromise therapeutic options for the infected patients.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Gentamicin	16S ribosomal RNA	Nucleotide	Enteric bacteria and other eubacteria	Yes	Binder	Details
Gentamicin C1a	16S ribosomal RNA	Nucleotide	Enteric bacteria and other eubacteria	Yes	Adduct	Details
Tobramycin	16S ribosomal RNA	Nucleotide	Enteric bacteria and other eubacteria	Yes	Inhibitor	Details