Nov 6, 2013

A genetic strategy to identify targets for the development of drugs that prevent bacterial persistence

Proceedings of the National Academy of Sciences of the United States of America
Jee-Hyun KimDirk Schnappinger

Abstract

Antibacterial drug development suffers from a paucity of targets whose inhibition kills replicating and nonreplicating bacteria. The latter include phenotypically dormant cells, known as persisters, which are tolerant to many antibiotics and often contribute to failure in the treatment of chronic infections. This is nowhere more apparent than in tuberculosis caused by Mycobacterium tuberculosis, a pathogen that tolerates many antibiotics once it ceases to replicate. We developed a strategy to identify proteins that Mycobacterium tuberculosis requires to both grow and persist and whose inhibition has the potential to prevent drug tolerance and persister formation. This strategy is based on a tunable dual-control genetic switch that provides a regulatory range spanning three orders of magnitude, quickly depletes proteins in both replicating and nonreplicating mycobacteria, and exhibits increased robustness to phenotypic reversion. Using this switch, we demonstrated that depletion of the nicotinamide adenine dinucleotide synthetase (NadE) rapidly killed Mycobacterium tuberculosis under conditions of standard growth and nonreplicative persistence induced by oxygen and nutrient limitation as well as during the acute and chronic phas...Continue Reading

  • References39
  • Citations50

Mentioned in this Paper

Amide Synthases
Tuberculosis
Antibiotic throat preparations
SspB protein, E coli
Pathogenic Organism
Drug Tolerance
Antifungal Antibiotics, Topical
NGFRAP1 gene
Etiology
Gene Expression Regulation, Enzymologic

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