Studies on the Inhibition of AmpC and other β-Lactamases by Cyclic Boronates

Samuel T. Cahill, Jonathan M. Tyrrell, Iva Hopkins Navratilova, Karina Calvopiña, Sean W. Robinson, Christopher T. Lohans, Michael A. McDonough, Ricky Cain, Colin W.G. Fishwick, Matthew B. Avison, Timothy R. Walsh, Christopher J. Schofield*, Jürgen Brem

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

16 Citations (Scopus)
106 Downloads (Pure)

Abstract

Background
The β-lactam antibiotics represent the most successful drug class for treatment of bacterial infections. Resistance to them, importantly via production of β-lactamases, which collectively are able to hydrolyse all classes of β-lactams, threatens their continued widespread use. Bicyclic boronates show potential as broad spectrum inhibitors of the mechanistically distinct serine- (SBL) and metallo- (MBL) β-lactamase families.

Methods
Using biophysical methods, including crystallographic analysis, we have investigated the binding mode of bicyclic boronates to clinically important β-lactamases. Induction experiments and agar-based MIC screening against MDR-Enterobacteriaceae (n = 132) were used to evaluate induction properties and the in vitro efficacy of a bicyclic boronate in combination with meropenem.

Results
Crystallographic analysis of a bicyclic boronate in complex with AmpC from Pseudomonas aeruginosa reveals it binds to form a tetrahedral boronate species. Microbiological studies on the clinical coverage (in combination with meropenem) and induction of β-lactamases by bicyclic boronates further support the promise of such compounds as broad spectrum β-lactamase inhibitors.

Conclusions
Together with reported studies on the structural basis of their inhibition of class A, B and D β-lactamases, biophysical studies, including crystallographic analysis, support the proposal that bicyclic boronates mimic tetrahedral intermediates common to SBL and MBL catalysis.

General significance
Bicyclic boronates are a new generation of broad spectrum inhibitors of both SBLs and MBLs.
Original languageEnglish
Pages (from-to)742-748
Number of pages7
JournalBiochimica et Biophysica Acta (BBA) - General Subjects
Volume1863
Issue number4
Early online date4 Feb 2019
DOIs
Publication statusPublished - 1 Apr 2019

Keywords

  • β-lactam antibiotic resistance
  • Cyclic boronate inhibitors
  • Metallo and serine β-lactamase inhibition
  • Transition state analogue
  • β-lactamase induction
  • Antimicrobial clinical coverage

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