Acceptor Specificity and Transfer Efficiency of a β-Glycosidase from the China White Jade Snail
摘要:
通过使用多种糖类作为受体,进一步研究了从中华白玉蜗牛中纯化的β-d-糖苷酶(G I)的受体特异性和转移潜力。G I 的转糖基化活性具有广泛的单糖接受体特异性。更具体地说,它能有效地催化β-d-岩藻糖基、β-d-葡糖基或β-d-半乳糖基从相应的对硝基苯基-β-d-吡喃甘露糖苷转移到各种单糖上。以对硝基苯-β-d-吡喃岩藻糖苷(pNPFuc)为供体,葡萄糖和木糖为受体,研究了 G I 的葡糖基转移效率。在非初速条件下,葡萄糖的产率为 88%,木糖的产率为 93%。以葡萄糖为受体的转移产物被分离出来,并通过核磁共振分析确定为 β-岩藻糖基-1,6-葡萄糖。这些分析数据表明,G I 具有广泛的受体特异性和较高的转糖基化效率。G I 的这些不常见的特性可能使其成为合成各种二糖的一种有价值的生物催化剂。
Acceptor Specificity and Transfer Efficiency of a β-Glycosidase from the China White Jade Snail
作者:Ying HU、Hongwei LUAN、Huixin LIU、Guangbo GE、Kun ZHOU、Yong LIU、Ling YANG
DOI:10.1271/bbb.80724
日期:2009.3.23
The acceptor specificity and transfer potential of a β-d-glycosidase (G I), which had been purified from the China white jade snail, were further investigated by using various sugars as acceptors. G I had broad monosaccharide acceptor specificity for its transglycosylation activity. More specifically, it efficiently catalyzed the transfer of the β-d-fucosyl, β-d-glucosyl or β-d-galactosyl moiety from the corresponding p-nitrophenyl-β-d-glycopyranosides to various monosaccharides. The transfucosylation efficiency of G I was studied by using p-nitrophenyl-β-d-fucopyranoside (pNPFuc) as the donor and glucose and xylose as the acceptors. The yields under conditions of non-initial velocity were 88% for glucose and 93% for xylose. The transfer product with glucose as the acceptor was isolated and identified as β-fucosyl-1,6-glucose by an NMR analysis. The data from these analyses indicate that G I had broad acceptor specificity and high efficiency for transglycosylation. These uncommon properties of G I could make it a valuable biocatalyst for the synthesis of various disaccharides.
通过使用多种糖类作为受体,进一步研究了从中华白玉蜗牛中纯化的β-d-糖苷酶(G I)的受体特异性和转移潜力。G I 的转糖基化活性具有广泛的单糖接受体特异性。更具体地说,它能有效地催化β-d-岩藻糖基、β-d-葡糖基或β-d-半乳糖基从相应的对硝基苯基-β-d-吡喃甘露糖苷转移到各种单糖上。以对硝基苯-β-d-吡喃岩藻糖苷(pNPFuc)为供体,葡萄糖和木糖为受体,研究了 G I 的葡糖基转移效率。在非初速条件下,葡萄糖的产率为 88%,木糖的产率为 93%。以葡萄糖为受体的转移产物被分离出来,并通过核磁共振分析确定为 β-岩藻糖基-1,6-葡萄糖。这些分析数据表明,G I 具有广泛的受体特异性和较高的转糖基化效率。G I 的这些不常见的特性可能使其成为合成各种二糖的一种有价值的生物催化剂。