Pygl phospho S430
Function
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.
Post-translational modifications
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.
Sequence Similarities
Belongs to the glycogen phosphorylase family.
Cellular localization
- Cytoplasm
- Cytosol
Alternative names
Pygl