| Literature DB >> 28223379 |
Ghady Haidar1, Cornelius J Clancy2,3,4, Ryan K Shields5,3, Binghua Hao3, Shaoji Cheng5, M Hong Nguyen1,5,3.
Abstract
We identified four blaKPC-3 mutations in ceftazidime-avibactam-resistant clinical Klebsiella pneumoniae isolates, corresponding to D179Y, T243M, D179Y/T243M, and EL165-166 KPC-3 variants. Using site-directed mutagenesis and transforming vectors into Escherichia coli, we conclusively demonstrated that mutant blaKPC-3 encoded enzymes that functioned as extended-spectrum β-lactamases; mutations directly conferred higher MICs of ceftazidime-avibactam and decreased the MICs of carbapenems and other β-lactams. Impact was strongest for the D179Y mutant, highlighting the importance of the KPC Ω-loop.Entities:
Keywords: KPC; ceftazidime-avibactam; drug resistance mechanisms; site-directed mutagenesis
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Year: 2017 PMID: 28223379 PMCID: PMC5404534 DOI: 10.1128/AAC.02534-16
Source DB: PubMed Journal: Antimicrob Agents Chemother ISSN: 0066-4804 Impact factor: 5.191