Thiol peroxidase protects Salmonella enterica from hydrogen peroxide stress in vitro and facilitates intracellular growth

J Bacteriol. 2010 Jun;192(11):2929-32. doi: 10.1128/JB.01652-09. Epub 2010 Mar 19.

Abstract

At present, Salmonella is considered to express two peroxiredoxin-type peroxidases, TsaA and AhpC. Here we describe an additional peroxiredoxin, Tpx, in Salmonella enterica and show that a single tpx mutant is susceptible to exogenous hydrogen peroxide (H(2)O(2)), that it has a reduced capacity to degrade H(2)O(2) compared to the ahpCF and tsaA mutants, and that its growth is affected in activated macrophages. These results suggest that Tpx contributes significantly to the sophisticated defense system that the pathogen has evolved to survive oxidative stress.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Bacterial Proteins / genetics
  • Bacterial Proteins / physiology*
  • Cell Line
  • Female
  • Gene Expression Regulation, Bacterial / drug effects
  • Gene Expression Regulation, Bacterial / genetics
  • Hydrogen Peroxide / pharmacology*
  • Mice
  • Mice, Inbred BALB C
  • Peroxidases / genetics
  • Peroxidases / physiology*
  • Salmonella enterica / drug effects
  • Salmonella enterica / enzymology*
  • Salmonella enterica / genetics
  • Salmonella enterica / growth & development*

Substances

  • Bacterial Proteins
  • Hydrogen Peroxide
  • Peroxidases