IUBMB Enzyme Nomenclature


Accepted name: glycogen phosphorylase

Reaction: [(1→4)-α-D-glucosyl]n + phosphate = [(1→4)-α-D-glucosyl]n-1 + α-D-glucose 1-phosphate

For diagram of reaction click here.

Other name(s): muscle phosphorylase a and b; amylophosphorylase; polyphosphorylase; amylopectin phosphorylase; glucan phosphorylase; α-glucan phosphorylase; 1,4-α-glucan phosphorylase; glucosan phosphorylase; granulose phosphorylase; maltodextrin phosphorylase; muscle phosphorylase; myophosphorylase; potato phosphorylase; starch phosphorylase; 1,4-α-D-glucan:phosphate α-D-glucosyltransferase; phosphorylase (ambiguous)

Systematic name: (1→4)-α-D-glucan:phosphate α-D-glucosyltransferase

Comments: This entry covers several enzymes from different sources that act in vivo on different forms of (1→4)-α-D-glucans. The accepted name should be modified for each specific instance by substituting "glycogen" with the name of the natural substrate, e.g. maltodextrin phosphorylase, starch phosphorylase, etc.

Links to other databases: BRENDA, EXPASY, KEGG, PDB, Metacyc, CAS registry number: 9035-74-9


1. Hanes, C.S. The breakdown and synthesis of starch by an enzyme from pea seeds. Proc. R. Soc. Lond. B Biol. Sci. 128 (1940) 421-450.

2. Green, A.A. and Cori, G.T. Crystalline muscle phosphorylase. I. Preparation, properties, and molecular weight. J. Biol. Chem. 151 (1943) 21-29.

3. Baum, H. and Gilbert, G.A. A simple method for the preparation of crystalline potato phosphorylase and Q-enzyme. Nature 171 (1953) 983-984. [PMID: 13063502]

4. Cowgill, R.W. Lobster muscle phosphorylase: purfication and properties. J. Biol. Chem. 234 (1959) 3146-3153. [PMID: 13812491]

5. Chen, G.S. and Segel, I.H. Purification and properties of glycogen phosphorylase from Escherichia coli. Arch. Biochem. Biophys. 127 (1968) 175-186. [PMID: 4878695]

6. Fischer, E.H., Pocker, A. and Saari, J.C. The structure, function and control of glycogen phosphorylase. In: Campbell, P.N. and Greville, G.D. (Eds), Essays in Biochemistry, vol. 6, Academic Press, London and New York, 1970, pp. 23-68.

[EC created 1961, modified 2013]

Return to EC 2.4.1 home page
Return to EC 2.4 home page
Return to EC 2 home page
Return to Enzymes home page
Return to IUBMB Biochemical Nomenclature home page