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Am J Physiol Cell Physiol 274: C1738-C1744, 1998;
0363-6143/98 $5.00
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Vol. 274, Issue 6, C1738-C1744, June 1998

Control of heat production by the Ca2+-ATPase of rabbit and trout sarcoplasmic reticulum

Leopoldo De Meis

Instituto de Ciências Biomédicas, Departamento de Bioquímica Médica, Universidade Federal do Rio de Janeiro, Cidade Universitária, Rio de Janeiro 21941-590, Brazil

The sarcoplasmic reticulum Ca2+-ATPase of rabbit skeletal muscle can convert the energy derived from a Ca2+ gradient into heat (L. de Meis, M. L. Bianconi, and V. A. Suzano. FEBS Lett. 406: 201-204, 1997). In this report, it is shown that this conversion varies depending on the temperature and on whether rabbit (endotherm) or trout (poikilotherm) sarcoplasmic reticulum vesicles are used. The gradient doubled the yield of heat produced during ATP hydrolysis and the calorimetric enthalpy of ATP hydrolysis (Delta Hcal) value found with both rabbit and trout varied between -10 and -12 kcal/mol in leaky vesicles (no gradient) and between -20 and -22 kcal/mol with intact vesicles (gradient). For the rabbit, the difference of Delta Hcal measured with and without gradient was detected in the range of 30-35°C and disappeared when the temperature was decreased below 30°C. For the trout, the difference was detected between 20 and 25°C and disappeared below 20°C. The effect of the gradient on the Delta Hcal for ATP hydrolysis was modified by DMSO, trifluoperazine, and heparin sodium.

calorimetric enthalpy of adenosine 5'-triphosphate hydrolysis


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