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Heparan sulfate is a highly sulfated polysaccharide that exhibits important physiological and pathological functions. The glucosamine residue of heparan sulfate can carry sulfo groups at the 2-N, 3-O, and 6-O positions, leading to diverse polysaccharide structures. 6-O-Sulfation at the glucosamine residue contributes to a wide range of biological functions. Here, we report a method for controlling the positioning of 6-O-sulfo groups in oligosaccharides. This was achieved by synthesizing oligosaccharide backbones from a disaccharide building block utilizing glycosyltransferases followed by modifications using heparan sulfate N-sulfotransferase and 6-O-sulfotransferases. This method offers a viable approach for preparing heparan sulfate oligosaccharides with precisely located 6-O-sulfo groups.

Enzymatic Placement of 6-O-Sulfo Groups in Heparan Sulfate