Role of efflux pumps and mutations in genes for topoisomerases II and IV in fluoroquinolone-resistant Pseudomonas aeruginosa strains.
Microb Drug Resist
; 9(4): 323-8, 2003.
Article
em En
| MEDLINE
| ID: mdl-15000738
ABSTRACT
We have investigated the occurrence of mutations in topoisomerase II (DNA gyrase) subunit B(gyrB) and topoisomerase IV subunit E(parE) and the hyperexpression of genes for four efflux pump proteins in 20 previously described, fluoroquinolone-resistant clinical strains of Pseudomonas aeruginosa. Amino acid alterations were found in GyrB in five strains and in ParE in three strains with MIC of norfloxacin > or = 8 mg/L, and it is likely that some of the alterations contribute to the quinolone resistance exhibited by these strains. Seventeen of the 20 strains overproduced mRNA for one or more pump proteins (MexB, MexD, MexF, or MexY), which caused multidrug resistance phenotype in more than half of strains. Two strains were hypermutable and one of them was highly resistant, but the other strain was only moderately resistant.
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Base de dados:
MEDLINE
Assunto principal:
Pseudomonas aeruginosa
/
DNA Topoisomerases Tipo II
/
Fluoroquinolonas
/
DNA Topoisomerase IV
/
Genes Bacterianos
/
Anti-Infecciosos
Idioma:
En
Revista:
Microb Drug Resist
Assunto da revista:
MICROBIOLOGIA
/
TERAPIA POR MEDICAMENTOS
Ano de publicação:
2003
Tipo de documento:
Article
País de afiliação:
Suécia