Structural and Kinetic Characterization of Diazabicyclooctanes as Dual Inhibitors of Both Serine-β-Lactamases and Penicillin-Binding Proteins

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• 作者：Andrew M. King ; Dustin T. King ; Shawn French ; Eric Brouillette ; Abdelhamid Asli ; J. Andrew N. Alexander ; Marija Vuckovic ; Samarendra N. Maiti ; Thomas R. Parr Jr. ; Eric D. Brown ; François Malouin ; Natalie C. J. Strynadka ; Gerard D. Wright
• 刊名：ACS Chemical Biology
• 出版年：2016
• 出版时间：April 15, 2016
• 年：2016
• 卷：11
• 期：4
• 页码：864-868
• 全文大小：301K
• 年卷期：0
• ISSN：1554-8937

文摘

Avibactam is a diazabicyclooctane β-lactamase inhibitor possessing outstanding but incomplete efficacy against multidrug-resistant Gram-negative pathogens in combination with β-lactam antibiotics. Significant pharmaceutical investment in generating derivatives of avibactam warrants a thorough characterization of their activity. We show here through structural and kinetic analysis that select diazabicyclooctane derivatives display effective but varied inhibition of two clinically important β-lactamases (CTX-M-15 and OXA-48). Furthermore, these derivatives exhibit considerable antimicrobial activity (MIC ≤ 2 μg/mL) against clinical isolates of Pseudomonas aeruginosa, Escherichia coli, and Enterobacter spp. Imaging of cell phenotype along with structural and biochemical experiments unambiguously demonstrate that this activity, in E. coli, is a result of targeting penicillin-binding protein 2. Our results suggest that structure–activity relationship studies for the purpose of drug discovery must consider both β-lactamases and penicillin-binding proteins as targets. We believe that this approach will yield next-generation combination or monotherapies with an expanded spectrum of activity against currently untreatable Gram-negative pathogens.