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Copper- and zinc-containing superoxide dismutase (Cu/ZnSOD) is suspected to be one of the anti-oxidant enzymes and virulence determinants active in some pathogenic micro-organisms. To elucidate the role of Cu/ZnSOD in the major human fungal pathogen Candida albicans, its gene, designated SOD1, was disrupted by the URA-blaster technique. The resulting sod1/sod1 mutant showed delayed hyphal growth on Spider medium but could still form hyphae on other solid media or in liquid media, particularly in response to serum. Moreover, the sod1/sod1 mutant was more sensitive to menadione, a redox-cycling agent, than the isogenic wild-type strain, although it still showed an adaptive oxidative stress response. Furthermore, the sod1/sod1 mutant cells exhibited slow growth in minimal medium when compared to the wild-type cells, but their growth was restored by the addition of lysine to the medium. Interestingly, C. albicans cells lacking Cu/ZnSOD showed increased susceptibility to macrophage attack and had attenuated virulence in mice. Thus, these results suggest that Cu/ZnSOD is required for the protection of C. albicans against oxidative stresses and for the full virulence of the organism to be expressed.

microbiology

Copper- and zinc-containing superoxide dismutase (Cu/ZnSOD) is required for the protection of Candida albicans against oxidative stresses and the expression of its full virulence