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Related Experiment Videos

Superoxide dismutase evolution and life span regulation.

Gary N Landis1, John Tower

  • 1Molecular and Computational Biology Program, Department of Biological Sciences, SHS172, University of Southern California, Los Angeles, CA 90089-1340, USA.

Mechanisms of Ageing and Development
|January 25, 2005
PubMed
Summary
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Superoxide dismutase (SOD) enzymes regulate reactive oxygen species (ROS) and oxidative stress. Phylogenetic analysis reveals diverse SOD gene families across species, suggesting independent evolution of extracellular forms.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Superoxide is a key reactive oxygen species (ROS) produced by mitochondria, implicated in cellular signaling and macromolecular damage.
  • Oxidative damage correlates with aging, highlighting the importance of ROS regulation.
  • Superoxide dismutase (SOD) enzymes detoxify superoxide, making them critical regulators of oxidative stress.

Purpose of the Study:

  • To investigate the diversity of SOD enzymes across different species.
  • To understand the evolutionary relationships and potential novel functions of SOD gene families.
  • To explore the mechanisms by which SODs influence oxidative stress resistance and lifespan.

Main Methods:

  • Phylogenetic analysis of publicly available SOD protein sequences.

Related Experiment Videos

  • Examination of genetic and transgenic manipulations of SOD activities in model organisms (S. cereviseae, mouse, Drosophila).

    • Main Results:

    • Identified conserved SOD gene families beyond the well-known Cu/Zn (Sod) and mitochondrial Mn-containing (Sod2) forms.
    • Discovered novel SOD forms in Drosophila (CCS, Sod3, Sodq), C. elegans (two Mn-SODs), and A. gambiae (internally repeated SOD).
    • Phylogenetic analysis suggests independent evolution of extracellular SODs via signal peptide addition to cytoplasmic SODs.

    Conclusions:

    • SOD enzymes represent a diverse group of proteins with varied structures and evolutionary histories.
    • The independent evolution of extracellular SODs points to convergent adaptation for ROS detoxification.
    • Further research is needed to elucidate the precise mechanisms underlying SOD-mediated lifespan extension and oxidative stress resistance.