hydrogen. The tetrasaccharide glycosides 6 and 12-14 were characterized by 1H-n.m.r. spectroscopy and evaluated as acceptors for GnT-II, the next enzyme in the pathway of biosynthesis of Asn-linked oligosaccharides. Deoxygenation of the 3-position of the beta-D-GlcNAc residue of 6 completely abolished its acceptor activity, whereas removal of HO-4 or HO-6 caused only modest decreases in activity.
UDP-GlcpNAc的3''-,4''-和6''-脱氧类似物已
化学合成,并被发现可作为人乳中
N-乙酰氨基葡萄糖基转移酶-I(GnT-1)的供体底物。在存在alpha-D-Manp-(1 ---- 3)-[alpha-D-Manp-(1 ---- 6)]-beta的情况下将
UDP-GlcpNAc和这些脱氧类似物与GnT-1一起孵育-D-Manp -O(
CH2)8COOMe得到了beta-D-GlcpNAc-(1 ---- 2)-alpha-D-Manp-(1 ---- 3)-[alpha-D-Manp-(1 ---- 6)]-beta-D-Manp-O( )8COOMe(6),和脱氧类似物12-14,其中beta-D-Manp-O( )8COOMe分别为HO-3,HO-4和HO-6 D-GlcNAc残基被氢取代。通过1H-nmr光谱对四糖苷6和12-14进行了表征,并被评估为GnT