Protein kinase A regulates glycogen metabolism by phosphoryl

Protein kinase A regulates glycogen metabolism by phosphorylating glycogen synthase and glycogen phosphatase. phosphorylase kinase. glycogen phosphorylase. protein kinase B. glucokinase.

Solution

Protein kinase A is a regulatory kinase which modulates glucogen metabolism. Accordingly, the protein kinase A phosphorylates and activates the kinase enzyme phosphorylase kinase which in turn phosphorylates and activates its down-stream taraget glycogen phosphorylase. The enzyme kinase glycogen phosphorylase is the terminal and active form of enzyme which metabolizes glycogen under the hormonal action of insulin. This glycogen is broken down and parts of it enter glycolysis cycle to yield energy. This process is called glycogenolysis.

Thus, the explanation stated above suggests that choice C is correct answer.