Download MendeleyHeteroaryl Phosphonates as Noncovalent Inhibitors of Both Serine- and Metallocarbapenemases.
Pemberton, O.A., Jaishankar, P., Akhtar, A., Adams, J.L., Shaw, L.N., Renslo, A.R., Chen, Y.(2019) J Med Chem 62: 8480-8496
- PubMed: 31483651
- DOI: https://doi.org/10.1021/acs.jmedchem.9b00728
- PubMed Abstract:
Gram-negative pathogens expressing serine β-lactamases (SBLs) and metallo-β-lactamases (MBLs), especially those with carbapenemase activity, threaten the clinical utility of almost all β-lactam antibiotics. Here we describe the discovery of a heteroaryl phosphonate scaffold that exhibits noncovalent cross-class inhibition of representative carbapenemases, specifically the SBL KPC-2 and the MBLs NDM-1 and VIM-2. The most potent lead, compound 16 , exhibited low nM to low μM inhibition of KPC-2, NDM-1, and VIM-2. Compound 16 potentiated imipenem efficacy against resistant clinical and laboratory bacterial strains expressing carbapenemases while showing some cytotoxicity toward human HEK293T cells only at concentrations above 100 μg/mL. Complex structures with KPC-2, NDM-1, and VIM-2 demonstrate how these inhibitors achieve high binding affinity to both enzyme classes. These findings provide a structurally and mechanistically new scaffold for drug discovery targeting multidrug resistant Gram-negative pathogens and more generally highlight the active site features of carbapenemases that can be leveraged for lead discovery.
- Department of Molecular Medicine , University of South Florida Morsani College of Medicine , 12901 Bruce B. Downs Boulevard, MDC 3522 , Tampa , Florida 33612 , United States.
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