α-L-Fucosidase acting on naturally occurring substrates was highly purified from the growth culture of Streptococcus sanguis ATCC 10557. The molecular weight of the enzyme was approximately 120,000 and the optimal pH was at 5.5. The purified enzyme showed specificity toward the linkage of α-(1→2) fucosides in oligosaccharides and glycoproteins. The enzyme released L-fucose from glycoprotein in human parotid saliva.
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