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- W2902567904 abstract "The presence of β-lactamases (e.g., PDC-3) that have naturally evolved and acquired the ability to break down β-lactam antibiotics (e.g., ceftazidime and ceftolozane) leads to highly resistant and potentially lethal Pseudomonas aeruginosa infections. We show that wild-type PDC-3 β-lactamase forms an acyl enzyme complex with ceftazidime, but it cannot accommodate the structurally similar ceftolozane that has a longer R2 side chain with increased basicity. A single amino acid substitution from a glutamate to a lysine at position 221 in PDC-3 (E221K) causes the tyrosine residue at 223 to adopt a new position poised for efficient hydrolysis of both cephalosporins. The importance of the mechanism of action of the E221K variant, in particular, is underscored by its evolutionary recurrences in multiple bacterial species. Understanding the biochemical and molecular basis for resistance is key to designing effective therapies and developing new β-lactam/β-lactamase inhibitor combinations." @default.
- W2902567904 created "2018-12-11" @default.
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- W2902567904 date "2018-12-21" @default.
- W2902567904 modified "2023-10-15" @default.
- W2902567904 title "Deciphering the Evolution of Cephalosporin Resistance to Ceftolozane-Tazobactam in Pseudomonas aeruginosa" @default.
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- W2902567904 doi "https://doi.org/10.1128/mbio.02085-18" @default.
- W2902567904 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6299481" @default.
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