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Related Experiment Videos

A comparative study of brain Ca2+-ATPases.

E G Trams1, C J Lauter

  • 1Developmental & Metabolic Neurology Branch, National Institute of Neurological & Communicative Disorders and Stroke, Bethesda, MD 20014.

Comparative Biochemistry and Physiology. B, Comparative Biochemistry
|January 1, 1978
PubMed
Summary

Brain ATPases in vertebrates show optimal activity with divalent cations like calcium, magnesium, and manganese. Enzyme activity increases with evolutionary complexity, suggesting a role for plasma membrane ecto-ATPases in brain function.

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Mn2+-stimulated ATPase in rat brain.

Neurochemical research·1983

Area of Science:

  • Biochemistry
  • Evolutionary Biology
  • Neuroscience

Background:

  • Adenosine triphosphatases (ATPases) are crucial enzymes involved in cellular energy metabolism.
  • Brain ATPases play vital roles in neuronal function and maintaining cellular homeostasis.
  • Understanding the evolutionary trajectory of these enzymes can provide insights into the development of complex nervous systems.

Purpose of the Study:

  • To investigate the biochemical properties of particulate brain ATPases across diverse vertebrate species.
  • To determine the optimal cation activators (Ca2+, Mg2+, Mn2+) for these enzymes.
  • To explore the relationship between ATPase activity and evolutionary progression in vertebrates.

Main Methods:

  • Isolation of particulate brain ATPase fractions from various vertebrate species.

Related Experiment Videos

  • Assay of enzyme activity using Adenosine Triphosphate (ATP) as a substrate, specifically AT32P.
  • Analysis of enzyme kinetics and response to different divalent cations (Ca2+, Mg2+, Mn2+).

    • Main Results:

    • Particulate brain ATPases exhibited optimal activation by Ca2+, Mg2+, or Mn2+ across the studied vertebrates.
    • Specific enzyme activity, measured with AT32P, was generally lower in primitive vertebrates and increased progressively along the evolutionary scale.
    • Enzyme properties indicated a significant contribution of plasma membrane ecto-ATPase activity.

    Conclusions:

    • Brain ATPase activity varies significantly across vertebrate evolution, correlating with increasing complexity.
    • Divalent cations are essential activators for brain ATPases, highlighting their role in enzyme function.
    • The findings strongly suggest that plasma membrane ecto-ATPases are a major component of brain ATPase activity in vertebrates.