Role of Methionine Sulfoxide Reductases A and B of Enterococcus Faecalis in Oxidative Stress and Virulence

Overview

Journal Infect Immun

Publisher American Society for Microbiology

Specialty Allergy & Immunology

Date 2010 Jun 23

PMID 20566694

Citations 48

Authors

Chen Zhao

Axel Hartke

Marilena La Sorda

Brunella Posteraro

Jean-Marie Laplace

Yanick Auffray

Maurizio Sanguinetti

Affiliations

Soon will be listed here.

Abstract

Methionine sulfoxide reductases A and B are antioxidant repair enzymes that reduce the S- and R-diastereomers of methionine sulfoxides back to methionine, respectively. Enterococcus faecalis, an important nosocomial pathogen, has one msrA gene and one msrB gene situated in different parts of the chromosome. Promoters have been mapped and mutants have been constructed in two E. faecalis strains (strains JH2-2 and V583) and characterized. For both backgrounds, the mutants are more sensitive than the wild-type parents to exposure to H2O2, and in combination the mutations seem to be additive. The virulence of the mutants has been analyzed in four different models. Survival of the mutants inside mouse peritoneal macrophages stimulated with recombinant gamma interferon plus lipopolysaccharide but not in naïve phagocytes is significantly affected. The msrA mutant is attenuated in the Galleria mellonella insect model. Deficiency in either Msr enzyme reduced the level of virulence in a systemic and urinary tract infection model. Virulence was reconstituted in the complemented strains. The combined results show that Msr repair enzymes are important for the oxidative stress response, macrophage survival, and persistent infection with E. faecalis.

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