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Antimicrobial Agents and Chemotherapy, September 2003, p. 2838-2843, Vol. 47, No. 9
0066-4804/03/$08.00+0     DOI: 10.1128/AAC.47.9.2838-2843.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Molecular Characterization of a New Class 3 Integron in Klebsiella pneumoniae

Mário Correia,1 Filipa Boavida,1 Filipa Grosso,1 M. J. Salgado,2 L. M. Lito,2 J. Melo Cristino,2 Sónia Mendo,3 and Aida Duarte1*

Laboratory of Microbiology, Faculty of Pharmacy,1 Laboratory of Microbiology, Faculty of Medicine, University of Lisbon, Lisbon,2 Department of Biology, University of Aveiro, Aveiro, Portugal3

Received 3 March 2003/ Returned for modification 21 April 2003/ Accepted 10 June 2003

Klebsiella pneumoniae FFUL 22K was isolated in April 1999 from the urine of an intensive care unit patient in Portugal. The strain showed an extended-spectrum cephalosporin resistance profile. A typical synergistic effect between cefotaxime or cefepime and clavulanic acid was observed. An Escherichia coli transformant displayed a similar resistance phenotype and harbored a ca. 9.4-kb plasmid (p22K9). Cloning experiments revealed that the extended-spectrum ß-lactamase was encoded by blaGES-1, previously described in class 1 integrons from K. pneumoniae ORI-1 and Pseudomonas aeruginosa Pa695. Further sequence analysis demonstrated that the blaGES-1 gene cassette was located on a new class 3 integron. The integron was 2,863 bp long and consisted of an intI3 integrase gene, an attI3 recombination site, two promoter regions, and two gene cassettes. The IntI3 integrase was 98.8% identical to that of Serratia marcescens AK9373. The blaGES-1 gene cassette was inserted at the attI3 site. The second gene cassette was the result of a fusion event between blaOXA-10-type and aac(6')-Ib gene cassettes and conferred resistance to kanamycin. This is the second class 3 integron reported and the first time that the blaGES-1 gene cassette has been found on an integron belonging to this class, highlighting the considerable heterogeneity of their genetic environment and the spread of gene cassettes among different classes of integrons.

* Corresponding author. Mailing address: Laboratory of Microbiology, Faculty of Pharmacy, University of Lisbon, Av. Forças Armadas, 1649-019 Lisbon, Portugal. Phone: (351) 217946440. Fax: (351) 217934212. E-mail: aduarte{at}ff.ul.pt.

Antimicrobial Agents and Chemotherapy, September 2003, p. 2838-2843, Vol. 47, No. 9
0066-4804/03/$08.00+0     DOI: 10.1128/AAC.47.9.2838-2843.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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