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J. Biol. Chem., Vol. 265, Issue 13, 7292-7300, May, 1990

Biosynthesis of heparin. Availability of glucosaminyl 3-O-sulfation sites

M Kusche, G Torri, B Casu and U Lindahl
Department of Veterinary Medical Chemistry, Swedish University of Agricultural Sciences, Uppsala.

Heparin preparations isolated from pig intestinal mucosa and from bovine lung were fractionated with regard to affinity for antithrombin. The resulting fractions, with high (HA) or low (LA) affinity for the proteinase inhibitor, were analyzed by 13C NMR or by identification of di- and tetrasaccharides obtained through deaminative cleavage with nitrous acid. Structural differences between corresponding HA and LA fractions were essentially restricted to minor constituents, in particular 3-O-sulfated glucosamine units that occurred (1 or 2 residues/chain) in all HA preparations but were scarce or absent in LA heparin. The HA fractions also consistently showed higher contents of nonsulfated iduronic acid and, to a lesser extent, N-acetylated glucosamine units than the LA fractions. The two tetrasaccharide sequences, -IdoA-GlcNAc(6-OSO3)-GlcA-GlcNSO3- and -IdoA-GlcNAc(6-OSO3)- GlcA-GlcNSO3(6-OSO3)- , recently implicated as part of the acceptor site for glucosaminyl 3-O-sulfate groups (Kusche, M., Backstrom, G., Riesenfeld, J., Petitou, M., Choay, J., and Lindahl, U. (1988) J. Biol. Chem. 263, 15474-15484), were identified in mucosal LA heparin; it was calculated that the preparation contained approximately one potential acceptor site/polysaccharide chain. Yet this material did not yield any labeled HA components on incubation with adenosine 3'-phosphate 5'- phospho-[35S]sulfate in the presence of glucosaminyl 3-O- sulfotransferase, solubilized from a mouse mastocytoma microsomal fraction. The failure to incorporate any 3-O-sulfate groups could conceivably be explained by the occurrence of a D-glucuronic rather than L-iduronic acid unit linked at the reducing ends of the above tetrasaccharide sequences. Alternatively, 3-O-sulfation may be restricted by other, as yet unidentified, inhibitory structural elements that are preferentially expressed in polysaccharide sequences selected for the generation of LA heparin.
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