Leptospira interrogans Catalase Is Required for Resistance to H2O2 and for Virulence
Identifieur interne : 005503 ( Main/Exploration ); précédent : 005502; suivant : 005504Leptospira interrogans Catalase Is Required for Resistance to H2O2 and for Virulence
Auteurs : Azad Eshghi [Canada] ; Kristel Lourdault [France] ; Gerald L. Murray [Australie] ; Thanatchaporn Bartpho [Thaïlande] ; Rasana W. Sermswan [Thaïlande] ; Mathieu Picardeau [France] ; Ben Adler [Australie] ; Brendan Snarr [Canada] ; Richard L. Zuerner [États-Unis, Suède] ; Caroline E. Cameron [Canada]Source :
- Infection and Immunity [ 0019-9567 ] ; 2012.
Abstract
Pathogenic
Url:
DOI: 10.1128/IAI.00466-12
PubMed: 22927050
PubMed Central: 3486042
Affiliations:
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Le document en format XML
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Catalase Is Required for Resistance to H<sub>2</sub>
O<sub>2</sub>
and for Virulence</title>
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Catalase Is Required for Resistance to H<sub>2</sub>
O<sub>2</sub>
and for Virulence</title>
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<author><name sortKey="Picardeau, Mathieu" sort="Picardeau, Mathieu" uniqKey="Picardeau M" first="Mathieu" last="Picardeau">Mathieu Picardeau</name>
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<front><div type="abstract" xml:lang="en"><p>Pathogenic <named-content content-type="genus-species">Leptospira</named-content>
spp. are likely to encounter higher concentrations of reactive oxygen species induced by the host innate immune response. In this study, we characterized <named-content content-type="genus-species">Leptospira interrogans</named-content>
catalase (KatE), the only annotated catalase found within pathogenic <named-content content-type="genus-species">Leptospira</named-content>
species, by assessing its role in resistance to H<sub>2</sub>
O<sub>2</sub>
-induced oxidative stress and during infection in hamsters. Pathogenic <named-content content-type="genus-species">L. interrogans</named-content>
bacteria had a 50-fold-higher survival rate under H<sub>2</sub>
O<sub>2</sub>
-induced oxidative stress than did saprophytic <named-content content-type="genus-species">L. biflexa</named-content>
bacteria, and this was predominantly catalase dependent. We also characterized KatE, the only annotated catalase found within pathogenic <named-content content-type="genus-species">Leptospira</named-content>
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 <italic>katE</italic>
in pathogenic <named-content content-type="genus-species">Leptospira</named-content>
bacteria drastically diminished leptospiral viability in the presence of extracellular H<sub>2</sub>
O<sub>2</sub>
and reduced virulence in an acute-infection model. Combined, these results suggest that <named-content content-type="genus-species">L. interrogans</named-content>
KatE confers <italic>in vivo</italic>
resistance to reactive oxygen species induced by the host innate immune response.</p>
</div>
</front>
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<li>France</li>
<li>Suède</li>
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<li>États-Unis</li>
</country>
<region><li>Iowa</li>
<li>Île-de-France</li>
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<name sortKey="Cameron, Caroline E" sort="Cameron, Caroline E" uniqKey="Cameron C" first="Caroline E." last="Cameron">Caroline E. Cameron</name>
<name sortKey="Snarr, Brendan" sort="Snarr, Brendan" uniqKey="Snarr B" first="Brendan" last="Snarr">Brendan Snarr</name>
</country>
<country name="France"><region name="Île-de-France"><name sortKey="Lourdault, Kristel" sort="Lourdault, Kristel" uniqKey="Lourdault K" first="Kristel" last="Lourdault">Kristel Lourdault</name>
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<name sortKey="Adler, Ben" sort="Adler, Ben" uniqKey="Adler B" first="Ben" last="Adler">Ben Adler</name>
<name sortKey="Adler, Ben" sort="Adler, Ben" uniqKey="Adler B" first="Ben" last="Adler">Ben Adler</name>
</country>
<country name="Thaïlande"><noRegion><name sortKey="Bartpho, Thanatchaporn" sort="Bartpho, Thanatchaporn" uniqKey="Bartpho T" first="Thanatchaporn" last="Bartpho">Thanatchaporn Bartpho</name>
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<name sortKey="Sermswan, Rasana W" sort="Sermswan, Rasana W" uniqKey="Sermswan R" first="Rasana W." last="Sermswan">Rasana W. Sermswan</name>
</country>
<country name="États-Unis"><region name="Iowa"><name sortKey="Zuerner, Richard L" sort="Zuerner, Richard L" uniqKey="Zuerner R" first="Richard L." last="Zuerner">Richard L. Zuerner</name>
</region>
</country>
<country name="Suède"><noRegion><name sortKey="Zuerner, Richard L" sort="Zuerner, Richard L" uniqKey="Zuerner R" first="Richard L." last="Zuerner">Richard L. Zuerner</name>
</noRegion>
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</record>
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