Journal
INFECTION AND IMMUNITY
Volume 80, Issue 11, Pages 3892-3899Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/IAI.00466-12
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Funding
- Natural Sciences and Engineering Research Council of Canada [327186]
- Institut Pasteur
- French Ministry of Research [ANR-08-MIE-018]
- Region Ile-de-France (DIM Malinf)
- Australian Research Council
- National Health and Medical Research Council
- University of Victoria
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Pathogenic Leptospira spp. are likely to encounter higher concentrations of reactive oxygen species induced by the host innate immune response. In this study, we characterized Leptospira interrogans catalase (KatE), the only annotated catalase found within pathogenic Leptospira species, by assessing its role in resistance to H2O2-induced oxidative stress and during infection in hamsters. Pathogenic L. interrogans bacteria had a 50-fold-higher survival rate under H2O2-induced oxidative stress than did saprophytic L. biflexa bacteria, and this was predominantly catalase dependent. We also characterized KatE, the only annotated catalase found within pathogenic Leptospira species. Catalase assays performed with recombinant KatE confirmed specific catalase activity, while protein fractionation experiments localized KatE to the bacterial periplasmic space. The insertional inactivation of katE in pathogenic Leptospira bacteria drastically diminished leptospiral viability in the presence of extracellular H2O2 and reduced virulence in an acute-infection model. Combined, these results suggest that L. interrogans KatE confers in vivo resistance to reactive oxygen species induced by the host innate immune response.
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