Glycogen phosphorylase is divided into active glycogen phosphorylase a (Glycogen phosphorylase a, GPa)
and inactive glycogen phosphorylase b (Glycogen phosphorylase b, GPb) two forms. The decomposition of
glycogen is mainly carried out under the catalysis of glycogen phosphorylase a. When no activator is added,
glycogen phosphorylase a catalyzes the production of glucose residues from glycogen and inorganic
phosphorus to glycogen and glucose 1-phosphate. Under the action of phosphoglucose mutase and 6-
phosphate glucose dehydrogenase, it further catalyzes the reduction of NADP to NADPH. Measuring the
rate of increase of NADPH at 340nm can reflect the activity of glycogen phosphorylase a.
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