Accepted name: nigerose phosphorylase
Reaction: 3-O-α-D-glucopyranosyl-D-glucopyranose + phosphate = D-glucose + β-D-glucose 1-phosphate
Glossary: 3-O-α-D-glucopyranosyl-D-glucopyranose = nigerose
Other name(s): cphy1874 (gene name)
Systematic name: 3-O-α-D-glucopyranosyl-D-glucopyranose:phosphate β-D-glucosyltransferase
Comments: The enzymes from Clostridium phytofermentans is specific for nigerose, and shows only 0.5% relative activity with kojibiose (cf. EC, kojibiose phosphorylase).
1.  Nihira, T., Nakai, H., Chiku, K. and Kitaoka, M. Discovery of nigerose phosphorylase from Clostridium phytofermentans. Appl. Microbiol. Biotechnol. 93 (2012) 1513–1522. [PMID: 21808968]
[EC created 2012]
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).
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]