Distinguishing on-target versus off-target activity in early antibacterial drug discovery using a macromolecular synthesis assay.

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Distinguishing on-target versus off-target activity in early antibacterial drug discovery using a macromolecular synthesis assay.

J Biomol Screen. 2013 Oct;18(9):1018-26

Authors: Cunningham ML, Kwan BP, Nelson KJ, Bensen DC, Shaw KJ

Abstract
The macromolecular synthesis assay was optimized in both S. aureus and E. coli imp and used to define patterns of inhibition of DNA, RNA, protein, and cell wall biosynthesis of several drug classes. The concentration of drug required to elicit pathway inhibition differed among the antimicrobial agents tested, with inhibition detected at concentrations significantly below the minimum inhibitory concentration (MIC) for tedizolid; within 4-fold of the MIC for ciprofloxacin, cefepime, vancomycin, tetracycline, and chloramphenicol; and significantly above the MIC for rifampicin and kanamycin. In a DNA gyrase/topoisomerase IV structure-based drug design optimization program, the assay rapidly identified undesirable off-target activity within certain chemotypes, altering the course of the program to focus on the series that maintained on-target activity.

PMID: 23686103 [PubMed - indexed for MEDLINE]