IUBMB Enzyme Nomenclature


Accepted name: 1,3-α-oligoglucan phosphorylase

Reaction: [(1→3)-α-D-glucosyl]n + phosphate = [(1→3)-α-D-glucosyl]n-1 + β-D-glucose 1-phosphate

Systematic name: 1,3-α-D-glucan:phosphate β-D-glucosyltransferase

Comments: The enzyme, isolated from the bacterium Clostridium phytofermentans, catalyses a reversible reaction. Substrates for the phosphorolytic reaction are α-1,3-linked oligoglucans with a polymerisation degree of 3 or more. Nigerose (i.e. 3-O-α-D-glucopyranosyl-D-glucopyranose) is not phosphorylyzed but can serve as substrate in the reverse direction (cf. EC, nigerose phosphorylase).

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:


1. Nihira, T., Nishimoto, M., Nakai, H., Ohtsubo, K., and Kitaoka, M. Characterization of two phosphorylases for α-1,3-oligoglucans from Clostridium phytofermentans. J. Appl. Glycosci. 61 (2014) 59-66.

[EC created 2014]

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