Journal
ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
Volume 56, Issue 4, Pages 2184-2186Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AAC.05961-11
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- INSERM, UM R 914, Paris, France
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A clinical Escherichia coli isolate resistant to all beta-lactams, including carbapenems, expressed a novel metallo-beta-lactamase (MBL), NDM-4, differing from NDM-1 by a single amino acid substitution (Met154Leu). NDM-4 possessed increased hydrolytic activity toward carbapenems and several cephalosporins compared to that of NDM-1. This amino acid substitution was not located in the known active sites of NDM-1, indicating that remote amino acid substitutions might also play a role in the extended activity of this MBL.
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