Abstract
Alginate lyase III of Sphingomonas sp. A1 cleaved the glycosidic linkage of polymannuronate and heteropolymeric region composed of mannuronate and guluronate, but was inert on polyguluronate. The enzyme was observed to act endolytically, interact with tetrasaccharide in alginate, and form di- and trisaccharides as final products. This result suggests that the enzyme recognizes the unit of tetrasaccharide in alginate and cleaves the middle linkage of the tetrasaccharide.
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