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Fusarium oxysporum highly produced α-l-fucosidase inductively in the culture broth when grown in a medium containing l-fucose, which is the reaction product of the enzyme. Production of the enzyme was also slightly induced by d-arabinose, but not by other sugars including glucose. To efficiently produce the enzyme, the fungus was grown in a glucose medium at first, and then the growing mycelia were transferred to an inducing medium containing only l-fucose.α-l-Fucosidase induced by l-fucose was purified from the inducing medium by fractionation with ammonium sulfate, DEAE-Sephadex A-50 column chromatography and gel filtration on a Sephadex G-100 column. The purified enzyme was judged to be homogeneous on polyacrylamide gel electrophoresis. The enzyme is a glycoprotein with a molecular weight of 75,000. The enzyme can hydrolyze ρ-nitrophenyl α-l-fucoside, a synthetic substrate, unlike the enzymes of other microorganisms. The Km value for the substrate was 0.48 mM. The optimum pH range was 4.5~6.0 and the s...

Induction and purification of .ALPHA.-L-fucosidase from Fusarium oxysporum.