Utilize este identificador para referenciar este registo: http://hdl.handle.net/10451/21344
Título: Molecular characterization of a new class 3 integron in Klebsiella pneumoniae
Autor: Correia, M
Boavida, F
Grosso, F
Salgado, MJ
Lito, LM
Cristino, JM
Mendo, S
Duarte, A
Palavras-chave: Microbiology
Pharmacology & Pharmacy
Data: 2003
Editora: AMER SOC MICROBIOLOGY
Citação: ANTIMICROBIAL AGENTS AND CHEMOTHERAPY. - Vol. 47, n. 9 (SEP 2003), p. 2838-2843
Resumo: 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 beta-lactamase was encoded by bla(GES-1), previously described in class 1 integrons from K. pneumoniae ORI-1 and Pseudomonas aeruginosa Pa695. Further sequence analysis demonstrated that the bla(GES-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 bla(GES-1) gene cassette was inserted at the attI3 site. The second gene cassette was the result of a fusion event between bla(OXA-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 bla(GES-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.
URI: http://hdl.handle.net/10451/21344
DOI: http://dx.doi.org/10.1128/AAC.47.9.2838-2843.2003
ISSN: 0066-4804
Aparece nas colecções:FF - Produção Científica 2000-2009

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