Laminaribiose phosphorylase (EC 2.4.1.31) is an enzyme coded for by the IbpA gene found in Paenibacillus. The enzyme catalyzes the chemical reaction
The two substrates of this enzyme are laminaribiose and orthophosphate (Pi). Its products are α-D-glucose 1-phosphate and D-glucose. It was originally characterised from Euglena gracilis and Astasia ocellata. The reaction can also proceed in the opposite direction, to give laminaribiose. This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is 3-beta-D-glucosyl-D-glucose:phosphate alpha-D-glucosyltransferase.
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