Abstract
Streptomyces sp. CN229 was isolated from Tunisia soil. This strain displayed antimicrobial activity against Gram positive and Gram negative bacteria. In addition it is resistant to most β-lactam antibiotics including imipenem and meropenem (MIC imipenem >70 μg/ml). Metallo-β-lactamase (MβL) production was confirmed by either imipenem MIC decrease in the presence of ethylene diamine tetraactic acid (EDTA) or the inhibition zone enhancement around EDTA-impregnated imipenem, or meropenem discs. Isolectric focusing analysis demonstrated the production of β-lactamase with pI of 5.8 that is inhibited by EDTA.Streptomyces sp. CN229 was screened for the imipenem resistance genes,bla VIM andbla IMP previously identified inPseudomonas aeruginosa. The presence of these genes was not confirmed by specific PCR analysis. We concluded that carbapenem resistance inStreptomyces sp. CN229 strain is mainly due to production of a novel carbapenemase. Our data show for the first time that MβL is produced byStreptomyces sp. MβL-mediated imipenem and meropenem resistance inStreptomyces is a cause for concern in the study of resistance evolution and antibiotic cluster biosynthetic genes.
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Lazim, H., Salah, A.M., Slama, N. et al. Biochemical detection of a metallo-β-lactamase in carbapenem resistant strain ofStreptomyces sp. CN229 isolated from soil. Ann. Microbiol. 57, 515–519 (2007). https://doi.org/10.1007/BF03175348
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DOI: https://doi.org/10.1007/BF03175348