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Antimicrobial Agents and Chemotherapy, February 2004, p. 491-496, Vol. 48, No. 2
0066-4804/04/$08.00+0     DOI: 10.1128/AAC.48.2.491-496.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Plasmid-Mediated 16S rRNA Methylase in Serratia marcescens Conferring High-Level Resistance to Aminoglycosides

Yohei Doi,* Keiko Yokoyama, Kunikazu Yamane, Jun-ichi Wachino, Naohiro Shibata, Tetsuya Yagi, Keigo Shibayama, Haru Kato, and Yoshichika Arakawa

Department of Bacterial Pathogenesis and Infection Control, National Institute of Infectious Diseases, Tokyo, Japan

Received 28 July 2003/ Returned for modification 30 September 2003/ Accepted 13 October 2003

Serratia marcescens S-95, which displayed an unusually high degree of resistance to aminoglycosides, including kanamycins and gentamicins, was isolated in 2002 from a patient in Japan. The resistance was mediated by a large plasmid which was nonconjugative but transferable to an Escherichia coli recipient by transformation. The gene responsible for the aminoglycoside resistance was cloned and sequenced. The deduced amino acid sequence of the resistance gene shared 82% identity with RmtA, which was recently identified as 16S rRNA methylase conferring high-level aminoglycoside resistance in Pseudomonas aeruginosa. Histidine-tagged recombinant protein showed methylation activity against E. coli 16S rRNA. The novel aminoglycoside resistance gene was therefore designated rmtB. The genetic environment of rmtB was further investigated. The sequence immediately upstream of rmtB contained the right end of transposon Tn3, including blaTEM, while an open reading frame possibly encoding a transposase was identified downstream of the gene. This is the first report describing 16S rRNA methylase production in S. marcescens. The aminoglycoside resistance mechanism mediated by production of 16S rRNA methylase and subsequent ribosomal protection used to be confined to aminoglycoside-producing actinomycetes. However, it is now identified among pathogenic bacteria, including Enterobacteriaceae and P. aeruginosa in Japan. This is a cause for concern since other treatment options are often limited in patients requiring highly potent aminoglycosides such as amikacin and tobramycin.

* Corresponding author. Mailing address: Department of Bacterial Pathogenesis and Infection Control, National Institute of Infectious Diseases, 4-7-1 Gakuen, Musashi-Muratyama, Tokyo 208-0011, Japan. Phone: 81-42-561-0771, ext. 538. Fax: 81-42-561-7173. E-mail: yohei{at}nih.go.jp.

Antimicrobial Agents and Chemotherapy, February 2004, p. 491-496, Vol. 48, No. 2
0066-4804/04/$08.00+0     DOI: 10.1128/AAC.48.2.491-496.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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