A membrane-bound creatine phosphokinase in fragmented sarcoplasmic reticulum.

R. Baskin,D. Deamer

Published 1970 in Journal of Biological Chemistry

ABSTRACT

Abstract Fragmented sarcoplasmic reticulum was isolated from rabbit skeletal muscle and creatine phosphokinase activity was measured; 0.2 to 1.16 units of creatine-P kinase per mg of fragmented sarcoplasmic reticulum protein were found. The activity was inhibited by dinitrofluorobenzene, a known inhibitor of creatine-P kinase, and had Km values similar to those measured for crystalline enzyme. Since the activity diasppeared from the supernatant upon centrifugation, the creatinine-P kinase is bound to the membranous fraction of the fragmented microsomal preparation. However, it was not present on the mitochondrial fraction from the same muscle homogenate. The creatine-P kinase of the fragmented sarcoplasmic reticulum preparation represents approximately 1% of the total activity in muscle and may be significant as a localized source of ATP for calcium transport processes during muscle relaxation.

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