Contribution of catalase to hydrogen peroxide resistance in Enterococcus faecalis.
Författare
Summary, in English
Enterococcus faecalis exhibits high resistance to oxidative stress. Several enzymes are responsible for this trait. The role of alkyl hydroperoxide reductase (Ahp), thiol peroxidase (Tpx), and NADH peroxidase (Npr) in oxidative stress defense was recently characterized. Enterococcus faecalis, in contrast to many other streptococci, contains a catalase (KatA), but this enzyme can only be formed when the bacterium is supplied with heme. We have used this heme dependency of catalase activity and mutants deficient in KatA and Npr to investigate the role of the catalase in resistance against exogenous and endogenous hydrogen peroxide stress. The results demonstrate that in the presence of environmental heme catalase contributes to the protection against toxic effects of hydrogen peroxide.
Avdelning/ar
Publiceringsår
2012
Språk
Engelska
Sidor
160-164
Publikation/Tidskrift/Serie
FEMS Microbiology Letters
Volym
331
Issue
2
Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
Oxford University Press
Ämne
- Microbiology
Nyckelord
- oxidative stress
- heme
- NADH peroxidase
- streptococci
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1574-6968