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. 1998 Aug 15;165(2):289-93.
doi: 10.1111/j.1574-6968.1998.tb13159.x.

Two novel plasmid-mediated cefotaxime-hydrolyzing beta-lactamases (CTX-M-5 and CTX-M-6) from Salmonella typhimurium

M Gazouli  1 , E Tzelepi, A Markogiannakis, N J Legakis, L S Tzouvelekis
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Two novel plasmid-mediated cefotaxime-hydrolyzing beta-lactamases (CTX-M-5 and CTX-M-6) from Salmonella typhimurium

M Gazouli et al. FEMS Microbiol Lett. .

Abstract

Two novel plasmid-mediated beta-lactamases (CTX-M-5 and CTX-M-6) produced by Salmonella typhimurium clinical strains were characterized. The enzymes exhibited a pI of 8.4, hydrolyzed oxyimino-beta-lactams and were susceptible to mechanism-based beta-lactamase inhibitors. The respective bla genes were cloned and sequenced. The deduced amino acid sequences showed a high degree of homology with those of the previously described plasmid class A CTX-M-type enzymes and appeared related to the chromosomal beta-lactamases of Klebsiella oxytoca.

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