Abstract
Substrate activation of the sarcoplasmic reticulum Ca2+-ATPase of skeletal muscles of ectothermic (the ground frog Rana temporaria and a Black Sea fish, the chuco Dasyatis pastinaca) and endothermic (rabbit) animals was studied. Comparison of kinetic dependencies (v on [S]) of this process for ectothermic animals with similar dependencies for endothermic animals has revealed their principal similarity. The cooperative character of the studied process in the millimolar ATP concentration range is discussed.
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