Oxidative stress and metal ions regulate a ferritin-like gene, dpr, in Streptococcus pyogenes

Chih Cheng Tsou, Chuan Chiang-Ni, Yee Shin Lin, Woei Jer Chuang, Ming T. Lin, Ching Chuan Liu, Jiunn Jong Wu

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Bacteria encounter oxidative stress by exposure to reactive oxygen species (ROS) present in the aerobic environment and during immune responses. In Streptococcus pyogenes, Dpr has been identified as a stress protein conferring resistance to hydrogen peroxide and multiple other stresses. The expression of Dpr is under perR (peroxide stress response regulator) control. However, the exact molecular mechanism of PerR regulation of Dpr is not clear. In this study, a perR deletion mutant was constructed by double cross-over mutagenesis. The profile of Dpr expression, performed by Western blot assay, revealed growth-phase dependency under normal culture conditions. Dpr expression decreased under iron-restricted conditions, whereas iron, zinc, nickel, and hydrogen peroxide induced its expression. The perR mutant does not induce Dpr as well when exposed to environmental signals. PerR binds the promoter region of dpr. Increased iron and hydrogen peroxide concentrations decreased PerR binding to the promoter region of dpr, suggesting that regulation of Dpr by environmental signals is mediated by PerR directly.

Original languageEnglish
Pages (from-to)259-264
Number of pages6
JournalInternational Journal of Medical Microbiology
Volume300
Issue number4
DOIs
Publication statusPublished - 2010 Apr 1

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Microbiology (medical)
  • Infectious Diseases

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