Compounds with potential activity against mycobacterium tuberculosis

Abstract

The high acquisition rate of drug resistance by Mycobacterium tuberculosis necessitates the ongoing search for new drugs to be incorporated in the tuberculosis (TB) regimen. Compounds used for the treatment of other diseases have the potential to be repurposed for the treatment of TB. In this study, a high-throughput screening of compounds against thiol-deficient Mycobacterium smegmatis strains and subsequent validation with thiol-deficient M. tuberculosis strains revealed that Delta;egtA and Delta;mshA mutants had increased susceptibility to azaguanine (Aza) and sulfaguanidine (Su); Delta;egtB and Delta;egtE mutants had increased susceptibility to bacitracin (Ba); and ΔegtA, Delta;mshA, and Delta;egtB mutants had increased susceptibility to fusaric acid (Fu). Further analyses revealed that some of these compounds were able to modulate the levels of thiols and oxidative stress in M. tuberculosis. This study reports the activities of Aza, Su, Fu, and Ba against M. tuberculosis and provides a rationale for further investigations.