A high throughput screening assay for anti-mycobacterial small molecules based on adenylate kinase release as a reporter of cell lysis

Lauren Forbes, Katherine Ebsworth-Mojica, Louis DiDone, Shao Gang Li, Joel S. Freundlich, Nancy Connell, Paul M. Dunman, Damian J. Krysan

Research output: Contribution to journalArticle

Abstract

Mycobacterium tuberculosis (Mtb) is well-established to be one of the most important bacterial pathogens for which new antimicrobial therapies are needed. Herein, we describe the development of a high throughput screening assay for the identification of molecules that are bactericidal against Mycobacteria. The assay utilizes the release of the intracellular enzyme adenylate kinase into the culture medium as a reporter of mycobacterial cell death. We demonstrate that the assay is selective for mycobactericidal molecules and detects anti-mycobacterial activity at concentrations below the minimum inhibitory concentration of many molecules. Thus, the AK assay is more sensitive than traditional growth assays. We have validated the AK assay in the HTS setting using the Mtb surrogate organism M. smegmatis and libraries of FDA approved drugs as well as a commercially available Diversity set. The screen of the FDA-approved library demonstrated that the AK assay is able to identify the vast majority of drugs with known mycobactericidal activity. Importantly, our screen of the Diversity set revealed that the increased sensitivity of the AK assay increases the ability of M. smegmatis-based screens to detect molecules with relatively poor activity against M. smegmatis but good to excellent activity against Mtb.

Original languageEnglish (US)
Article numbere0129234
JournalPloS one
Volume10
Issue number6
DOIs
StatePublished - Jun 22 2015

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

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    Forbes, L., Ebsworth-Mojica, K., DiDone, L., Li, S. G., Freundlich, J. S., Connell, N., Dunman, P. M., & Krysan, D. J. (2015). A high throughput screening assay for anti-mycobacterial small molecules based on adenylate kinase release as a reporter of cell lysis. PloS one, 10(6), [e0129234]. https://doi.org/10.1371/journal.pone.0129234