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Eur J Biochem. 1979 Jun;97(1):251-6.

The hormonal control of glycogen metabolism. Phosphorylation of protein phosphatase inhibitor-1 in vivo in response to adrenaline.


Inhibitor-1 has been shown to be phosphorylated in skeletal muscle in vivo. In normal fed animals the degree of phosphorylation was 31 +/- 7% and this value increases to 70 +/- 12% following an intravenous injection of adrenaline. The results imply that the phosphorylation of inhibitor-1 may be equally as important as the phosphorylation of phosphorylase kinase in elevating the levels of phosphorylase a. The role of inhibitor-1 in metabolism is discussed.

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