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Intracellular glycosidases were measured in cell-free extracts obtained by ultrasonic disruption of a gram-negative soil coccobacillus (Chase, 1938). From these extracts, α-l -fucosidase was purified about 120-fold by salting out with (NH4 )2 SO4 , ion exchange chromatography, and gel filtration. The approximate molecular weight of the enzyme was 50,000; itsp H optimum was 5. The enzyme was inhibited byl -fucose and split this sugar from a purified acid mucopolysaccharide from chicken chorioallantoic fluid. The acid mucopolysaccharide is identical with a component (host antigen) of the hemagglutinin of influenza virus. Its antigenic reactivity is altered by cell-free extracts of the bacterium, in which the responsible enzyme is thought to be an α-l -fucosidase.

α-l-Fucosidase from a Soil Bacterium