GP12 catalyzes cleavage of the glycerol phosphate polymer chain in WTA analogs. Reactions contained 100 μm [14C]glycerol-labeled WTA analog and 1 or 0.1 μm GP12, for the non-glycosylated and glycosylated lipid ϕ.40 analog, respectively. After termination of the reactions at specified time points, [14C]glycerol phosphate containing products were separated by anion exchange HPLC. Analog structures, with sites of 14C incorporation marked by asterisks, are shown below radioactive chromatograms for A, products from the degradation of lipid ϕ.40 analog; inset shows the 18-h time point on a magnified scale and B, products from degradation of glycosylated lipid ϕ.40 analog; inset shows the products from reaction of [14C]glucose-glycosylated lipid ϕ.40 analog.