Nigerose phosphorylase (EC 2.4.1.279, cphy1874 (gene)) is an enzyme with systematic name 3-O-alpha-D-glucopyranosyl-D-glucopyranose:phosphate beta-D-glucosyltransferase. This enzyme catalyses the following chemical reaction
The enzymes from Clostridium phytofermentans is specific for nigerose.