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I think you're referring to glycogen phosphorylase, which is an enzyme that catalyzes the reaction where glycogen is turned into a glucose-molecule, therefore making it available for transformation to energy.

Glycogen phosphorylase comes in two forms, A and B. Usually, the A form is considered the active form, whilst B is the inactive form. That is a modified truth, since both of these forms can exist in a T (tense) inactive state and R (relaxed) active state, depending on the presence of ADP (residue after phosphorylation of ATP). But usually, A is in its R state and B is in its T state. So for the sake of argument, we say A is active and B is inactive.

So the short answer would be 'No'. For example, hormones such as epinephrine, insulin, and glucagon regulate glycogen phosphorylase. Essentially, epinephrine and glucagon promotes the A form (by activating phosphorylase kinase, an enzyme that transforms A into B), and insulin promotes the B form (by inhibiting the phosphorylase kinase).

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12y ago

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