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Gene Review

ECs4834  -  superoxide dismutase

Escherichia coli O157:H7 str. Sakai

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Disease relevance of ECs4834

  • SOD-null mutants have been prepared to reveal the biological effects of O2-. SodA, sodB E. coli exhibit dioxygen-dependent auxotrophies and enhanced mutagenesis, reflecting O2(-)-sensitive biosynthetic pathways and DNA damage [1].
  • Transformed lactococci expressed an active SodA fusion protein plus an active hybrid protein composed of subunits of the Lactococcus and the recombinant E. coli enzymes [2].

High impact information on ECs4834

  • We measured the generation of hydroxyl radical (OH(.)) and oxidative DNA lesions in aerobically grown Escherichia coli cells lacking in both superoxide dismutases (SodA SodB) and repressor of iron uptake (Fur) using electroparamagnetic resonance and gas chromatography-mass spectrometry with a selected-ion monitoring method [3].
  • A striking result was the selenite induction of 8 enzymes with antioxidant properties, particularly the manganese and iron superoxide dismutases (SodA and SodB) [4].
  • The deduced amino acid sequence specifies a 187-amino-acid protein with 75% identity to the S. aureus SodA protein [5].
  • These data indicate that while SodA may be the major SOD activity in S. aureus throughout all stages of growth, SodM, under oxidative stress, becomes a major source of activity during the late exponential and stationary phases of growth such that viability and growth of an S. aureus sodA mutant are maintained [5].


  1. Superoxide radical and superoxide dismutases. Fridovich, I. Annu. Rev. Biochem. (1995) [Pubmed]
  2. Cloning and expression of the manganese superoxide dismutase gene of Escherichia coli in Lactococcus lactis and Lactobacillus gasseri. Roy, D.G., Klaenhammer, T.R., Hassan, H.M. Mol. Gen. Genet. (1993) [Pubmed]
  3. Role of iron and superoxide for generation of hydroxyl radical, oxidative DNA lesions, and mutagenesis in Escherichia coli. Nunoshiba, T., Obata, F., Boss, A.C., Oikawa, S., Mori, T., Kawanishi, S., Yamamoto, K. J. Biol. Chem. (1999) [Pubmed]
  4. Involvement of superoxide dismutases in the response of Escherichia coli to selenium oxides. Bébien, M., Lagniel, G., Garin, J., Touati, D., Verméglio, A., Labarre, J. J. Bacteriol. (2002) [Pubmed]
  5. Identification and characterization of a second superoxide dismutase gene (sodM) from Staphylococcus aureus. Valderas, M.W., Hart, M.E. J. Bacteriol. (2001) [Pubmed]
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