Terminally sialylated oligosaccharides were synthesised employing recombinant trans-sialidase from Trypanosoma cruzi. Regio- and stereoselectively Sia-α(2–3)-Gal-βR derivatives could be obtained in respectable yields, using combined chemical and enzymatic methodologies. An array of different disaccharide precursors such as Gal-β(1–3)-GalNAc-αSer/Thr, lactosides and lactosamide derivatives were sialylated and successfully purified by facile isolation procedures. Depending on the acceptor structure isolated, yields for trans-sialylation products were between 20 and 60%.
利用克氏锥虫的
重组反
硅烷化酶合成了末端
硅烷基化
寡糖。利用
化学和酶法相结合的方法,可以获得具有区域和立体选择性的 Sia-α(2-3)-Gal-βR 衍
生物,产量可观。一系列不同的二糖前体,如 Gal-β(1-3)-GalNAc-αSer/Thr、
乳糖苷和
乳糖酰胺衍
生物,都通过简便的分离程序进行了
硅烷基化并成功纯化。根据所分离的受体结构,反糖酰化产物的产率在 20% 到 60% 之间。