Journal
ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
Volume 60, Issue 7, Pages 3934-3941Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AAC.00358-16
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- HHS \ National Institutes of Health (NIH) [R01-AI100291]
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Staphylococcus aureus is an important cause of both hospital- and community-associated methicillin-resistant S. aureus (MRSA) infections worldwide. beta-Lactam antibiotics are the drugs of choice to treat S. aureus infections, but resistance to these and other antibiotics make treatment problematic. High-level beta-lactam resistance of S. aureus has always been attributed to the horizontally acquired penicillin binding protein 2a (PBP 2a) encoded by the mecA gene. Here, we show that S. aureus can also express high-level resistance to beta-lactams, including new-generation broad-spectrum cephalosporins that are active against methicillin-resistant strains, through an uncanonical core genome-encoded penicillin binding protein, PBP 4, a nonessential enzyme previously considered not to be important for staphylococcal beta-lactam resistance. Our results show that PBP 4 can mediate high-level resistance to beta-lactams.
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