作者:Yoshiyuki Fukase、San-Qi Zhang、Keiko Iseki、Masato Oikawa、Koichi Fukase、Shoichi Kusumoto
DOI:10.1055/s-2001-18109
日期:——
New efficient synthesis of lipid A, an immunostimulating glycoconjugate of bacteria, was achieved for the construction of lipid A library by using synthesis based on affinity separation (SAS), where the compounds possessing a barbituric acid (BA)-tag are selectively and rapidly purified by interaction with an artificial receptor for BA. Glycosylation of a glycosyl acceptor possessing the BA-tag with a 4′-phosphorylated N-Troc glucosaminyl trichloroacetimidate gave the disaccharide 4′-phosphate, which was purified by the affinity separation. Successive removal of protective groups and introduction of acyl groups were then effected and the synthetic intermediate at each step was purified by the affinity separation. Cleavage of the tag and subsequent deprotection afforded Escherichia coli lipid A. SAS enabled the rapid preparation of lipid A, therefore, proved to be a promising method for synthesis of other complex glycoconjugates.
通过使用基于亲和分离的合成方法(SAS)构建脂质 A 库,在 SAS 中,具有巴比妥酸(BA)标签的化合物通过与 BA 的人工受体相互作用而被选择性地快速纯化。将具有 BA 标记的糖基受体与 4′-磷酸化的 N-Troc 葡萄糖氨酰三氯乙酰亚氨酸进行糖基化,得到 4′-磷酸二糖,并通过亲和分离进行纯化。然后连续去除保护基团和引入酰基,并通过亲和分离纯化每一步的合成中间体。SAS 能够快速制备脂质 A,因此被证明是合成其他复杂糖结合物的一种可行方法。