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Chapter 15: Problem 20

Figure 15.17 traces the activation of glycogen phosphorylase from hormone to phosphorylation of the \(b\) form of glycogen phosphorylase to the \(a\) form. These effects are reversible when hormone disappears. Suggest reactions by which such reversibility is achieved.

Short Answer

Expert verified
The disappearance of the hormone triggers the enzyme phosphoprotein phosphatase to remove the phosphate group from the activated glycogen phosphorylase \(a\), this process is known as dephosphorylation. Thus, the activated glycogen phosphorylase \(a\) is turned back to the inactive glycogen phosphorylase \(b\).

Step by step solution

01

Identify the Process

The process begins with the \(a\) form of glycogen phosphorylase. In response to the disappearance of the hormone, the process to revert back to the \(b\) form is initiated.
02

Identify the Enzyme Involved

This reverse process is facilitated by an enzyme. The enzyme Phosphoprotein phosphatase is reported to play a role in the dephosphorylation, it removes the phosphate group from the activated glycogen phosphorylase \(a\).
03

Result of the Reaction

After this dephosphorylation reaction, we end up with the inactive glycogen phosphorylase \(b\). This shows how the changes can reverse when the hormone is no longer present.

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