Porcine liver (2 → 3)-α-sialyltransferase: substrate specificity studies and application of the immobilized enzyme to the synthesis of various sialylated oligosaccharide sequences
作者:André Lubineau、Karine Basset-Carpentier、Claudine Augé
DOI:10.1016/s0008-6215(97)00043-8
日期:1997.5
In search of substrate analogues for the porcine liver beta-D-Galp-(1 --> 3)-D-Galp-NAc: CMP-Neu5Ac-(2 --> 3')-alpha-sialyltransferase, three disaccharides beta-D-Galp-(1 --> 3)-beta-D-Galp-O-CH3 (5), beta-D-Galp-(1 --> 3)-beta-D-(2-OAc)-Galp-O-CH3 (7) and beta-D-Galp-(1 --> 3)-beta-D-(2-OAc)-Galp-O-Bn (11) were synthesized and tested with the enzyme. Disaccharide 7 turned out to be a very good substrate allowing a rapid access to the trisaccharide alpha-Neu5Ac-(2 --> 3)-beta-D-Galp-(1 --> 3)-P-D-(2-OAc)-Galp-O-CH3 (13) on a preparative scale using the crude enzyme immobilized on cationic exchanger. Trisaccharide 13 was further exploited, first as a sialyl donor in Trypanosoma cruzi trans-sialidase catalyzed reaction and second through acetolysis reaction as a source for the synthon alpha-Neu5Ac-(2 --> 3)-D-Gal (16). (C) 1997 Elsevier Science Ltd.