Elucidating the Catalytic Power of Glutamate Racemase by Investigating a Series of Covalent Inhibitors.

Abstract:

:The application of covalent inhibitors has experienced a renaissance within drug discovery programs in the last decade. To leverage the superior potency and drug target residence time of covalent inhibitors, there have been extensive efforts to develop highly specific covalent modifications to decrease off-target liabilities. Herein, we present a series of covalent inhibitors of an antimicrobial drug target, glutamate racemase, discovered through structure-based virtual screening. A combination of enzyme kinetics, mass spectrometry, and surface-plasmon resonance experiments details a highly specific 1,4-conjugate addition of a small-molecule inhibitor with a catalytic cysteine of glutamate racemase. Molecular dynamics simulations and quantum mechanics-molecular mechanics geometry optimizations reveal the chemistry of the conjugate addition. Two compounds from this series of inhibitors display antimicrobial potency similar to β-lactam antibiotics, with significant activity against methicillin-resistant S. aureus strains. This study elucidates a detailed chemical rationale for covalent inhibition and provides a platform for the development of antimicrobials with a novel mechanism of action against a target in the cell wall biosynthesis pathway.

journal_name

ChemMedChem

journal_title

ChemMedChem

authors

Vance NR,Witkin KR,Rooney PW,Li Y,Pope M,Spies MA

doi

10.1002/cmdc.201800592

subject

Has Abstract

pub_date

2018-12-06 00:00:00

pages

2514-2521

issue

23

eissn

1860-7179

issn

1860-7187

journal_volume

13

pub_type

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