New derivatives of reducing oligosaccharides and their use in enzymatic reactions: efficient synthesis of sialyl Lewis a and sialyl dimeric Lewis x glycoconjugates
作者:Mattias Bårström、Mia Bengtsson、Ola Blixt、Thomas Norberg
DOI:10.1016/s0008-6215(00)00128-2
日期:2000.10
Purification of the products after each enzymatic step was conveniently performed by solid-phase extraction on silica gel C-18 cartridges. Two oligosaccharide derivatives (with sialyl Lewis a and sialyl dimeric Lewis x structures) were prepared. Conversion of the obtained derivatives into neoglycoproteins by the sequence hydrogenolysis, thiophosgene treatment, and protein coupling was carried out.
用苄氧基羰基氨基苯胺和氰基硼氢化钠将还原性低聚糖乳糖和乳糖-N-四糖还原胺化,然后用乙酸酐处理所得仲胺。用各种糖基转移酶/核苷酸糖对所得的N-乙酰基-N-(4-苄氧基羰基氨基苯基)-1-氨基-1-脱氧醛二糖寡糖衍生物进行逐步酶促延伸。通过在硅胶C-18柱上进行固相萃取,可以方便地进行每个酶促步骤后产物的纯化。制备了两种寡糖衍生物(具有唾液酸化的路易斯a和唾液酸化的二聚Lewis x结构)。通过顺序氢解,硫光气处理和蛋白质偶联,将获得的衍生物转化为新糖蛋白。