کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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3361286 | 1591908 | 2006 | 5 صفحه PDF | دانلود رایگان |
Eight strains of Pseudomonas aeruginosa producing IMP-5 carbapenemases were collected from three Portuguese hospitals. All isolates were epidemiologically unrelated. The blaIMP-5 gene was inserted into a class 1 integron previously reported in Acinetobacter baumannii 65FFC. Expression of the the blaIMP-5 gene in P. aeruginosa has been shown to be driven by the P1 promoter [TTGATA] in which the cytosine was replaced by thymine, which caused an increase in transcription of blaIMP-5 that was confirmed by site-directed mutagenesis. The minimum inhibitory concentrations (MICs) of imipenem for Escherichia coli pGMLA-1 (the recombinant from A. baumannii 65FFC) and E. coli pATG-2 (the recombinant from P. aeruginosa isolates) were 0.5 mg/L and >32 mg/L, respectively. This study reports the spread of a class 1 integron In76 with a new point mutation in the P1 promoter sequence leading to overproduction of IMP-5.
Journal: International Journal of Antimicrobial Agents - Volume 27, Issue 1, January 2006, Pages 27–31