Stereochemistry of the hydrolysis of α,α-trehalose by trehalase, determined by using a labelled substrate
作者:Jacques Defaye、Hugues Driguez、Bernard Henrissat、Edith Bar-Guilloux
DOI:10.1016/0008-6215(83)88462-6
日期:1983.12
times. Equimolecular amounts of α- and β- d -glucopyranose are released simultaneously by the action of the enzyme. This result is consistent with a bimolecular substitution mechanism, taking into account previous results involving C-2 asymmetric participation in the catalytic step of hydrolysis of α,α-trehalose. For comparative evaluation of its accuracy, the usual polarimetric technique was also used
摘要2,3,4,6-四-O-苄基-d-(1-13 C)吡喃葡萄糖的帕维亚缩合反应制得(1,1'- 13 C)α,α-海藻糖,收率为37%,在三氟甲磺酸酐存在下于二氯甲烷中,然后进行常规的脱保护技术。使用13 Cn.mr光谱仪以短记录时间在37°下监控金龟子海藻糖酶对该底物的水解。通过该酶的作用,同时释放等摩尔量的α-和β-d-吡喃葡萄糖。考虑到先前涉及C-2不对称参与α,α-海藻糖水解催化步骤的结果,该结果与双分子取代机理一致。为了对其准确性进行比较评估,