Essential bifunctional enzyme that catalyzes both the N-deacetylation and the N-sulfation of glucosamine(GlcNAc) of the glycosaminoglycan in heparan sulfate. Modifies the GlcNAc-GlcA dissacharide repeating sugar backboneto make N-sulfated heparosan, a prerequisite substrate for later modifications in heparin biosynthesis. Plays a rolein determining the extent and pattern of sulfation of heparan sulfate. Compared to other NDST enzymes, its presence isabsolutely required. Participates in biosynthesis of heparan sulfate that can ultimately serve as L-selectin ligands,thereby playing a role in inflammatory response
