Super Oxide Dismutase (SOD)

Updated November 24, 2025

Molecules (Molecular Biology)

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Feature Description
Enzyme Type Metalloenzyme catalyzing dismutation of superoxide radicals (O₂⁻•) to oxygen (O₂) and hydrogen peroxide (H₂O₂).
Overall Reaction 2 O₂⁻• + 2 H⁺ → O₂ + H₂O₂
Isoforms & Localization – SOD1 (Cu/Zn SOD): cytosol, peroxisomes; requires copper and zinc.
– SOD2 (Mn SOD): mitochondrial matrix; requires manganese.
– SOD3 (extracellular Cu/Zn SOD): extracellular fluids; requires copper and zinc.
Cofactors / Essential Elements – Copper (Cu²⁺): catalytic redox center for Cu/Zn SOD.
– Zinc (Zn²⁺): structural stabilization for Cu/Zn SOD.
– Manganese (Mn³⁺/Mn²⁺): redox cofactor for Mn SOD.
– Iron (Fe²⁺/Fe³⁺): cofactor in prokaryotic Fe SOD (e.g., E. coli).
Mechanism 1. Oxidation of superoxide by reduced metal center → forms O₂.
2. Reduction of superoxide by oxidized metal center → forms H₂O₂.
Net effect: rapid scavenging of superoxide radicals (~10⁹ M⁻¹s⁻¹).
Gene Regulation – SOD1: constitutive expression; upregulated by oxidative stress.
– SOD2: transcription regulated by NF-κB, AP-1 in response to ROS, cytokines.
– SOD3: regulated in response to extracellular ROS and growth factors.
Biological Role – Protects cells from oxidative damage.
– Modulates redox signaling.
– Influences apoptosis, inflammation, and aging.
Clinical Relevance – Mutations in SOD1: linked to familial ALS (amyotrophic lateral sclerosis).
– Altered SOD2 activity: implicated in cancer, cardiovascular disease.
– Therapeutic SOD mimetics: under investigation for oxidative stress conditions.
Essential Synthesis Requirements – Amino acids: SOD is a protein; requires ribosomal translation.
– Metal availability: proper incorporation of Cu, Zn, Mn, or Fe.
– Chaperones: e.g., CCS (copper chaperone for SOD1) for correct metal insertion.
– Oxygen presence: SOD functions in oxidative environments.

This table captures the biochemical essentials, cofactors, isoforms, and synthesis requirements of SOD.

  • Here are some existing diagrams / structural
    visualizations for superoxide dismutase (SOD):
    • McKee JSmol viewer — interactive 3D structure of Cu/Zn‑SOD (showing metal
      coordination) and Mn‑SOD. mckee.sdu.dk
    • Antioxidants (MDPI) — Figure 1: composition and domain diagrams for SOD1, SOD2, and
      SOD3. MDPI
    • Superoxide Dismutases: Role in Redox Signaling (PMC) —
      Figure 4: schematic alignment of SOD isoforms and copper chaperone CCS. PMC
    • Nickel SOD (PubMed) — structure and mechanism of
      Ni‑dependent SOD. pubmed.ncbi.nlm.nih.gov

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