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Temperature acclimation of Mg2+Ca2+-myofibrillar ATPase from a cold-selective teleost,Salvelinus fontinalis: a compromise solution

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Summary

Brook trout (Salvelinus fontinalis, Mitchill) were acclimated over 15 weeks to either +4°C or +24°C. The effects of temperature on myofibrillar Mg2+Ca2+-ATPase activities were investigated. In contrast to goldfish, temperature acclimation does not alter the kinetic properties of the brook trout myofibrillar ATPase. Activation energy (ΔG#) is lower and substrate turnover number is higher than values previously reported for cold-adapted stenotherms. Properties of brook trout ATPase appear to be a compromise enabling function across a broad temperature range. The different strategies of adapting to seasonal temperature variations are briefly discussed.

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Author notes

  1. N. J. Walesby

    Present address: Department of Biological Sciences, University of London, Goldsmiths College, Lewisham Way, SE14 6NW, London, England

Authors and Affiliations

  1. Department of Physiology and Pharmacology, University of St. Andrews, Bute Medical Buildings, KY16 9TS, St. Andrews, Fife, Scotland

    N. J. Walesby & I. A. Johnston

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  1. N. J. Walesby
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  2. I. A. Johnston
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Additional information

The authors are grateful to the Wellcome Trust for financial support.-Correspondence should be addressed to I.A.J.

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Walesby, N.J., Johnston, I.A. Temperature acclimation of Mg2+Ca2+-myofibrillar ATPase from a cold-selective teleost,Salvelinus fontinalis: a compromise solution. Experientia 37, 716–718 (1981). https://doi.org/10.1007/BF01967940

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