Structures of Novel Acidic Galactooligosaccharides Synthesized by<i>Bacillus circulans</i>β-Galactosidase
作者:Shuichi YANAHIRA、Yukiko YABE、Masamichi NAKAKOSHI、Susumu MIURA、Noritaka MATSUBARA、Hidetoshi ISHIKAWA
DOI:10.1271/bbb.62.1791
日期:1998.1
The structures of acidic oligosaccharides synthesized by a transglycosylation reaction by Bacillus circulans β-galactosidase, using lactose as the galactosyl donor, and N-acetylneuraminic acid (NeuAc) and glucuronic acid (GlcUA) as the acceptors were investigated. Acidic oligosaccharides thus synthesized were purified by anion exchange chromatography and charcoal chromatography. The MS and NMR studies indicated that the acidic oligosaccharides from NeuAc were Galβ-(1→8)-NeuAc, Galβ-(1→9)-NeuAc, and Galβ-(1→3)-Galβ-(1→8)-NeuAc, and those from GlcUA were Galβ-(1→3)-GlcUA and Galβ-(1→4)-Galβ-(1→3)-GlcUA. These are novel acidic galactooligosaccharides.
以乳糖为半乳糖基供体,N-乙酰神经氨酸(NeuAc)和葡萄糖醛酸(GlcUA)为受体,通过环状芽孢杆菌β-半乳糖苷酶的转糖基反应合成酸性寡糖的结构。通过阴离子交换色谱法和活性炭色谱法纯化如此合成的酸性寡糖。 MS和NMR研究表明NeuAc的酸性寡糖是Galβ-(1→8)-NeuAc、Galβ-(1→9)-NeuAc和Galβ-(1→3)-Galβ-(1→8)- NeuAc 和来自 GlcUA 的那些是 Galβ-(1→3)-GlcUA 和 Galβ-(1→4)-Galβ-(1→3)-GlcUA。这些是新型酸性低聚半乳糖。