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In enzymology, a 1,3-beta-oligoglucan phosphorylase (EC 2.4.1.30) is an enzyme that catalyzes the chemical reaction

(1,3-beta-D-glucosyl)n + phosphate ${\displaystyle \rightleftharpoons }$ (1,3-beta-D-glucosyl)n-1 + alpha-D-glucose 1-phosphate

Thus, the two substrates of this enzyme are (1,3-beta-D-glucosyl)n and phosphate, whereas its two products are (1,3-beta-D-glucosyl)n-1 and alpha-D-glucose 1-phosphate.

This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is 1,3-beta-D-oligoglucan:phosphate alpha-D-glucosyltransferase. Other names in common use include beta-1,3-oligoglucan:orthophosphate glucosyltransferase II, and beta-1,3-oligoglucan phosphorylase.

References

• Marechal LR (1967). "Beta-1,3-oligoglucan:orthophosphate glucosyltransferases from Euglena gracilis. I. Isolation and some properties of a beta-1,3-oligoglucan phosphorylase". Biochimica et Biophysica Acta (BBA) - Enzymology. 146 (2): 417–30. doi:10.1016/0005-2744(67)90226-4. PMID 6066291.
• Marechal LR (1967). "Beta-1,3-oligoglucan: orthophosphate glucosyltransferases from Euglena gracilis. II. Comparative studies between laminaribiose- and beta-1,3-oligoglucan phosphorylase". Biochimica et Biophysica Acta (BBA) - Enzymology. 146 (2): 431–42. doi:10.1016/0005-2744(67)90227-6. PMID 6066292.

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