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Superoxide radical and superoxide dismutases

I Fridovich1

  • 1Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710, USA.

Annual Review of Biochemistry
|January 1, 1995
PubMed
Summary

Superoxide dismutases (SODs) protect against oxidative damage by scavenging superoxide radicals. However, some SODs can mimic hydroxyl radical production, and their absence leads to cellular dysfunction and shorter lifespans.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Superoxide (O2-) radicals inactivate iron-sulfur clusters in dehydratases, leading to Fe(II) release and potential hydroxyl radical (OH.) generation.
  • Superoxide dismutases (SODs) are crucial enzymes that scavenge superoxide radicals, mitigating oxidative stress.
  • Certain copper, zinc-containing SODs (Cu, ZnSODs) possess peroxidase activity that can interfere with assays measuring hydroxyl radical production.

Purpose of the Study:

  • To investigate the multifaceted roles of SODs in cellular protection and organismal health.
  • To explore the mechanisms by which SODs inhibit hydroxyl radical production.
  • To understand the consequences of SOD deficiency in various organisms.

Main Methods:

  • Analysis of SOD activity and peroxidase functions.
  • Generation and study of SOD-null mutants in bacteria (E. coli), yeast, and Drosophila.
  • Assessment of oxidative stress markers, auxotrophies, mutagenesis, and lifespan.

Main Results:

  • Cu, ZnSODs can exhibit non-specific peroxidase activity, potentially leading to artifactual detection of hydroxyl radicals.
  • Extracellular and periplasmic Cu, ZnSODs protect against extracellular superoxide and nitric oxide reactions.
  • SOD-null mutants display oxygen-dependent auxotrophies, increased mutagenesis, DNA damage, oxygen intolerance, and shortened lifespans.

Conclusions:

  • SODs are essential for protecting against oxidative damage and maintaining cellular and organismal integrity.
  • The specific isoforms and localizations of SODs are critical for their protective functions.
  • Understanding SODs' dual roles and the impact of their absence is vital for developing therapeutic strategies against oxidative stress-related diseases.

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