Journal
ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
Volume 62, Issue 8, Pages -Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AAC.00638-18
Keywords
beta-lactamases; ceftazidime; regulation
Categories
Funding
- Antimicrobial Resistance Cross Council Initiative [MR/N013646/1]
- SENESCYT, Ecuador
- MRC [MR/N013646/1] Funding Source: UKRI
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The hyperproduction of chromosomally encoded beta-lactamases is a key method of acquired resistance to ceftazidime, aztreonam, and, when seen in backgrounds having reduced envelope permeability, carbapenems. Here, we show that the loss of Mpl, a UDP-muramic acid/peptide ligase, is a common and previously overlooked cause of chromosomally encoded beta-lactamase hyperproduction in clinical isolates of Stenotrophomonas maltophilia and Pseudomonas aeruginosa, important pathogens notorious for their beta-lactam-resistant phenotypes.
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