Pygl phospho S430

Allosteric enzyme that catalyzes the rate-limiting step in glycogen catabolism, the phosphorolytic cleavage of glycogen to produce glucose-1-phosphate, and plays a central role in maintaining cellular and organismal glucose homeostasis.

Acetylation, which is up-regulated by glucose and insulin and down-regulated by glucagon, inhibits the glycogen phosphorylase activity by promoting PPP1R3B-mediated recruitment of phosphatase PP1 and Ser-15 dephosphorylation.

Phosphorylation at Ser-15 converts inactive phosphorylase b into active phosphorylase a. Dephosphorylation of Ser-15 by phosphatase PP1 inactivates the enzyme.

Belongs to the glycogen phosphorylase family.

• Cytoplasm
• Cytosol

Pygl

• swissprot:Q9ET01

Proteins

Metabolism

97463Da