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Insect Na(+)/K(+)-ATPase.

M B.A. Djamgoz1, P D. Ready, P F. Billingsley

  • 1Department of Biology, Imperial College of Science, Technology and Medicine, Prince Consort Road, London, UK

Journal of Insect Physiology
|May 29, 2003
PubMed
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The sodium/potassium pump (Na(+)/K(+)-ATPase) is vital for nerve cell function across animal evolution. While its structure is conserved, its roles vary between insects and vertebrates, except in nerve cells.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Na(+)/K(+)-ATPase (sodium/potassium pump) is a crucial P-type ion-motive ATPase in animal cell plasma membranes.
  • Vertebrate Na(+)/K(+)-ATPase functions in nerves, heart, and kidney are well-defined by distinct isoforms.
  • Insects possess a single alpha-subunit isoform, differing from vertebrates.

Purpose of the Study:

  • To compare insect and vertebrate Na(+)/K(+)-ATPases.
  • To investigate the conserved and divergent roles of Na(+)/K(+)-ATPase.
  • To understand the evolutionary significance of Na(+)/K(+)-ATPase.

Main Methods:

  • Comparative analysis of Na(+)/K(+)-ATPase structure and function.
  • Examination of tissue distribution and isoform variations.

Related Experiment Videos

  • Functional assessment in nerve cells.

    • Main Results:

    • Na(+)/K(+)-ATPase structure and mode of action are highly conserved between insects and vertebrates.
    • Specific roles of Na(+)/K(+)-ATPase differ across most tissues in insects and vertebrates.
    • The enzyme is indispensable for nerve cell function in both groups.

    Conclusions:

    • Na(+)/K(+)-ATPase is fundamental to metazoan evolution, particularly for nerve cell function.
    • Despite conserved mechanisms, Na(+)/K(+)-ATPase exhibits divergent tissue-specific roles.
    • The single insect isoform highlights conserved essential functions over isoform diversification.