Regioselective syntheses of new tri- and tetrasaccharides from β-glucobioses by Trichoderma viride β-glucosidase and their structural analyses by NMR spectroscopy
作者:Hiroyuki Kono、Markus R. Waelchili、Masashi Fujiwara、Tomoki Erata、Mitsuo Takai
DOI:10.1016/s0008-6215(99)00166-4
日期:1999.9
and gentiobiose into β- d -Glc-(1→6)-β- d -Glc-(1→3)- d -Glc (15.3%) and β- d -Glc-(1→6)-β- d -Glc-(1→6)- d -Glc (20.2%), respectively. The structures of the products were determined by 1 H and 13 C NMR spectroscopy. This high regio- and stereoselectivity demonstrated by the enzyme could be applied for oligosaccharide synthesis in general.
A new beta-glucosidase, which was partially purified from Trichoderma viride cellulase, catalyzed a transglycosylation reaction of cellobiose to give beta-D-Glcp-(1-->6)beta-D-Glcp-(1 --> 4)-D-Glcp 1 and beta-D-Glcp-(1 --> 6)-beta-D-Glcp-(1 --> 6)-beta-D-Glcp-(1 --> 4)-D-Glcp 2, regioselectively. Furthermore, the enzyme converted laminaribiose and gentiobiose into beta-D-Glcp-(1 -->6)-beta-D-Glcp-(1 --> 3)-D-Glcp 3 and beta-o-Glcp-(1 --> 6)-beta-D-Glcp-(1 --> 6)-D-Glcp 4, respectively. Selective beta-(1-->6) transglycosylation was achieved.
Takeo, Kenichi; Nagayoshi, Kimiko; Nishimura, Kenichi, Journal of Carbohydrate Chemistry, 1994, vol. 13, # 8, p. 1159 - 1178