Abstract
ABSTRACTElectron microscopy revealed that heat treatment in the range 35–55°C caused no observable change in membrane structures of the sarcoplasmic reticulum (SR). Proteins with molecular weights about 200 and 400 kDa, (probably dimers and tetramers of Ca2+‐ATPase, respectively) were observed in SDS‐PAGE when the light SR was treated at 49 and 55°C respectively. Ca2+ leakage from the SR was markedly enhanced with increasing temperatures, especially for the heavy SR. Results suggest that the decrease of Ca2+ uptake ability following heat treatment is at least partly caused by the acceleration of Ca2+ leakage together with irreversible denaturation of Ca2+‐AT‐Pase protein.
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