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Calpain processing of brain microtubules from the Atlantic Cod, Gadus morhua

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Abstract

Microtubules isolated from Atlantic cod (Gadus morhua) brains retained assembly competence and ultraculture, although treatment with rabbit calpain resulted in loss of MAPs. In addition, spirals and aberrant structures formed when calpain I was activated post assembly. No such effect was seen with calpain II. Soluble fractions from cod brain were found to contain proteolytic activity that could be blocked by exogenously added calpastatin. Calpain was also isolated from cod muscle tissue with 10 times less yield, compared to rabbit lung. On the basis of Ca2+-requirements for activation in the mM range, electrophoretic mobility, antigenicity and hydrophobicity, we conclude that the proteolytic activity was attributable to calpain II. There was no difference in effects of rabbit and cod calpain II on cod microtubule proteins, indicating that calpain is a conserved protein. Our results suggest that calpains might be involved in the Ca2+-dependent irreversible regulation of cod brain microtubules.

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Authors and Affiliations

  1. Comparative Neuroscience Unit, Dep. Zoophysiology, Univ. of Göteborg, Medicinaregatan 18, S-413 90, Göteborg, Sweden

    Martin Billger & Margareta Wallin

  2. Institute of Neurobiology, Univ. of Göteborg, Medicinaregatan 18, S-413 90, Göteborg, Sweden

    Elisabeth Nilsson & Jan-Olof Karlsson

Authors
  1. Martin Billger
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  2. Elisabeth Nilsson
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  3. Jan-Olof Karlsson
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  4. Margareta Wallin
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Billger, M., Nilsson, E., Karlsson, JO. et al. Calpain processing of brain microtubules from the Atlantic Cod, Gadus morhua. Mol Cell Biochem 121, 85–92 (1993). https://doi.org/10.1007/BF00928703

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  • DOI: https://doi.org/10.1007/BF00928703

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