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Volume 149, Issue 10

Role and regulation of the superoxide dismutases of Free

Abstract

has two superoxide dismutases (SODs), encoded by the and genes, which inactivate harmful superoxide radicals () encountered during host infection or generated from aerobic metabolism. The transcriptional start sites have been mapped and expression analysis on reporter fusions in both genes has been carried out. Under standard growth conditions, manganese (Mn), a mineral superoxide scavenger, elevated total SOD activity but had no effect on the transcription of either gene. Transcription of and was most strongly induced by either internally or externally generated , respectively. Sensitivity to internally generated was linked with SodA deficiency. Mn supplementation completely rescued a mutant when challenged by internally generated , and this was growth-phase-dependent. Sensitivity to externally generated stress was only observed in a mutant and was Mn-independent. In a mouse abscess model of infection, isogenic , and mutants had reduced virulence compared to the parental strain, showing the importance of the enzymic scavenging system for the survival of the pathogen.

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Keyword(s): SOD, superoxide dismutase and X/XO, xanthine/xanthine oxidase
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2003-10-01
2025-04-30
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Role and regulation of the superoxide dismutases of Staphylococcus aureus
Microbiology 149, 2749 (2003); https://doi.org/10.1099/mic.0.26353-0
/content/journal/micro/10.1099/mic.0.26353-0
/content/journal/micro/10.1099/mic.0.26353-0
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