Reaction catalyzed by 1,3-alpha-oligoglucan phosphorylase (2.4.1.334)

		+			=			+
	3-O-alpha-D-glucopyranosyl-3-O-alpha-D-glucopyranosyl-3-O-alpha-D-glucopyranosyl-D-glucopyranose	+		phosphate	=		3-O-alpha-D-glucopyranosyl-3-O-alpha-D-glucopyranosyl-D-glucopyranose	+		beta-D-glucopyranose 1-phosphate