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Activity of phosphoryl creatine shuttle enzymes in rat cardiac fast twitch and slow twitch skeletal muscles



Activity of phosphoryl creatine shuttle enzymes in rat cardiac fast twitch and slow twitch skeletal muscles



Biochemical & Biophysical Research Communications 104(2): 740-745



Energy producing and energy utilizing reactions in muscle are coherently linked by a phosphorylcreatine shuttle mechanism. Operational components of the shuttle were evaluated in muscles encompassing a wide metabolic and contractile spectrum. Consistent CPK[creatine phosphokinase]/ATPase ratios suggest homogeneous function of the myofibrillar component of the shuttle. Mitochondrial CPK/ATPase ratios vary due to 4-fold differences in CPK activity with respect to oxidative phosphorylation. The phosphorylcreatine shuttle mechanism, and the mitochondrial component in particular, seems a relevant, physiological regulator of skeletal and cardiac muscle function.

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