Stochastic expression of lactate dehydrogenase A induces Escherichia coli persister formation

Naoki Yamamoto, Rino Isshiki, Yuto Kawai, Daiki Tanaka, Tetsushi Sekiguchi, Shinya Matsumoto, Satoshi Tsuneda

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Bacterial persisters are phenotypic variants that survive the treatment of lethal doses of growth-targeting antibiotics without mutations. Although the mechanism underlying persister formation has been studied for decades, how the persister phenotype is switched on and protects itself from antibiotics has been elusive. In this study, we focused on the lactate dehydrogenase gene (ldhA) that was upregulated in an Escherichia coli persister-enriched population. A survival rate assay using an ldhA-overexpressing strain showed that ldhA expression induced persister formation. To identify ldhA-mediated persister formation at the single-cell level, time-lapse microscopy with a microfluidic device was used. Stochastic ldhA expression was found to induce dormancy and tolerance against high-dose ampicillin treatment (500 μg/ml). To better understand the underlying mechanism, we investigated the relationship between ldhA-mediated persister formation and previously reported persister formation through aerobic metabolism repression. As a result, ldhA expression enhanced the proton motive force (PMF) and ATP synthesis. These findings suggest that ldhA-mediated persister formation pathway is different from previously reported persister formation via repression of aerobic metabolism.

Original languageEnglish
Pages (from-to)30-37
Number of pages8
JournalJournal of Bioscience and Bioengineering
Volume126
Issue number1
DOIs
Publication statusPublished - 2018 Jul

Keywords

  • Energy metabolism
  • Escherichia coli
  • Microfluidic device
  • Persister
  • Proton motive force
  • Single cell
  • Stochastic expression
  • ldhA

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Applied Microbiology and Biotechnology

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