Virtual Screening and Experimental Testing of B1 Metallo-β-lactamase Inhibitors

J Chem Inf Model. 2018 Sep 24;58(9):1902-1914. doi: 10.1021/acs.jcim.8b00133. Epub 2018 Aug 29.

Abstract

The global rise of metallo-β-lactamases (MBLs) is problematic due to their ability to inactivate most β-lactam antibiotics. MBL inhibitors that could be coadministered with and restore the efficacy of β-lactams are highly sought after. In this study, we employ virtual screening of candidate MBL inhibitors without thiols or carboxylates to avoid off-target effects using the Avalanche software package, followed by experimental validation of the selected compounds. As target enzymes, we chose the clinically relevant B1 MBLs NDM-1, IMP-1, and VIM-2. Among 32 compounds selected from an approximately 1.5 million compound library, 6 exhibited IC50 values less than 40 μM against NDM-1 and/or IMP-1. The most potent inhibitors of NDM-1, IMP-1, and VIM-2 had IC50 values of 19 ± 2, 14 ± 1, and 50 ± 20 μM, respectively. While chemically diverse, the most potent inhibitors all contain combinations of hydroxyl, ketone, ester, amide, or sulfonyl groups. Docking studies suggest that these electron-dense moieties are involved in Zn(II) coordination and interaction with protein residues. These novel scaffolds could serve as the basis for further development of MBL inhibitors. A procedure for renaming NDM-1 residues to conform to the class B β-lactamase (BBL) numbering scheme is also included.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anti-Bacterial Agents / chemistry
  • Anti-Bacterial Agents / pharmacology
  • Circular Dichroism
  • Computer Simulation
  • Drug Evaluation, Preclinical / methods*
  • Escherichia coli / genetics
  • Escherichia coli / metabolism
  • Gene Expression Regulation, Enzymologic
  • Mass Spectrometry
  • Models, Chemical
  • Molecular Structure
  • Software
  • beta-Lactamase Inhibitors / chemistry*
  • beta-Lactamase Inhibitors / pharmacology*
  • beta-Lactamases / classification*
  • beta-Lactamases / metabolism*

Substances

  • Anti-Bacterial Agents
  • beta-Lactamase Inhibitors
  • beta-Lactamases