Synthesis and Biological Evaluation of Phosphono Analogues of Capsular Polysaccharide Fragments fromNeisseria meningitidis A
作者:Maria I. Torres-Sanchez、Cristina Zaccaria、Benedetta Buzzi、Gianluca Miglio、Grazia Lombardi、Laura Polito、Giovanni Russo、Luigi Lay
DOI:10.1002/chem.200601743
日期:2007.8.6
which is made up of (1-->6)-linked 2-acetamido-2-deoxy-alpha-D-mannopyranosyl phosphate repeating units. Since this chemical lability is a product of the inherent instability of the phosphodiester bridges, here we report the synthesis of phosphonoester-linked oligomers of N-acetyl mannosamine as candidates for stabilised analogues of the corresponding phosphate-bridged saccharides. The installation of each
A型脑膜炎奈瑟氏球菌(MenA)是一种革兰氏阴性封装的细菌,可能引起脑膜炎的爆发性流行,尤其是在非洲撒哈拉以南地区。一种有效的针对脑膜炎奈瑟氏球菌A的糖缀合物疫苗的开发和生产受到其荚膜多糖水解稳定性差的阻碍,荚膜多糖由(1-> 6)连接的2-acetamido-2-deoxy-alpha-组成D-甘露聚糖基磷酸酯重复单元。由于这种化学不稳定性是磷酸二酯桥固有稳定性的产物,因此我们在此报道了N-乙酰甘露糖胺的膦酸酯连接的低聚物的合成,作为相应的磷酸桥糖的稳定类似物的候选物。通过糖基C-膦酸酯结构单元与甘露糖胺基残基的6-OH部分的Mitsunobu偶联来实现每个糖苷间膦酸酯键的安装。每个合成的化合物在其还原端(α-或β-定向)均包含一个O-连接的氨基丙基间隔基,以允许蛋白质结合。通过竞争性ELISA分析研究了合成分子的相对亲和力,结果表明,人多克隆抗MenA血清可以识别膦酸酯桥连的片段1-3