筋肉蛋白質の代謝活性-2-シロネズミの無蛋白飼育初期における筋肉ATPaseの活性度変化

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As a part of the study on the metabolic lability of muscle proteins, the changes in activity of each Ca2+ and Mg2+ ion-activated ATPase were examined in rats fed a protein-free diet for 4 and 8 days. And, the following facts were shown: (1) The unit activities of both ATPases were reduced on the 4 th day to about 90% level of each initial value; and on the 8 th day the activity of the Ca2+ ion-activated ATPase was reduced to about 82% level, whereas that of the Mg2+ ion-activated one remained almost unchanged. (2) The total activities of both ATPases and the total amount of ethanol-denatured proteins of muscle were reduced nearly in an exponential manner corresponding to the decreasing pattern of reserve proteins. Thus, the reserve proteins in muscle are suggested to contain these enzyme proteins, or such functional proteins as concern with energy metabolism. (3) The total amount of the proteins lost in muscle was apparently greater than in liver in spite of the fact that the rate of their loss in muscle was far less than in liver.
社団法人日本農芸化学会の論文