glycogenolysis

Utilization of glycogen stores to generate glucose-1-phosphate & glucose for glycolysis. Three enzymes are involved: 1) glycogen phosphorylase a) cleaves alpha-1,4-glycosidic bonds b) generates glucose-1-phosphate + glycogen (n-1) 2) glycogen debranching enzyme a) transferase & hydrolase activity b) transfers a block of 3 glycosyl residues (1,4-alpha) from one branch to another to generate branch with 1 residue at 1,6-alpha linkage site c) hydrolyzes alpha 1,6 glycosidic bond generate glucose + debranched glycogen (n-1)

References

Biochemistry, L. Stryer, WH Freeman & Co, New York, 1988 pg 449-454