Abstract
A clinical Escherichia coli isolate resistant to all β-lactams, including carbapenems, expressed a novel metallo-β-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.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Amino Acid Substitution
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Anti-Bacterial Agents / pharmacology
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Bacterial Proteins / genetics
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Bacterial Proteins / metabolism*
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Carbapenems / pharmacology
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Cephalosporins / pharmacology
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Cloning, Molecular
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DNA, Bacterial / genetics
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Escherichia coli / drug effects
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Escherichia coli / enzymology*
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Escherichia coli / genetics
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Humans
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Hydrolysis
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Kinetics
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Microbial Sensitivity Tests
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Plasmids / genetics
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Polymerase Chain Reaction
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Urinary Tract Infections / microbiology
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beta-Lactamases / genetics
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beta-Lactamases / metabolism*
Substances
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Anti-Bacterial Agents
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Bacterial Proteins
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Carbapenems
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Cephalosporins
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DNA, Bacterial
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beta lactamase NDM-4, E coli
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beta-Lactamases
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carbapenemase