Non-stoichiometric O-acetylation of Shigella flexneri 2a O-specific polysaccharide: synthesis and antigenicity
作者:Charles Gauthier、Pierre Chassagne、François-Xavier Theillet、Catherine Guerreiro、Françoise Thouron、Farida Nato、Muriel Delepierre、Philippe J. Sansonetti、Armelle Phalipon、Laurence A. Mulard
DOI:10.1039/c3ob42586j
日期:——
Synthetic functional mimics of the O-antigen from Shigella flexneri 2a are seen as promising vaccine components against endemic shigellosis. Herein, the influence of the polysaccharide non-stoichiometric di-O-acetylation on antigenicity is addressed for the first time. Three decasaccharides, representing relevant internal mono- and di-O-acetylation profiles of the O-antigen, were synthesized from a
来自弗氏志贺氏菌2a的O抗原的合成功能模拟物被认为是对抗地方性志贺氏菌病的有前途的疫苗成分。在此,首次解决了多糖非化学计量的二-O-乙酰化对抗原性的影响。从十个关键的保护性十糖合成了三个十糖,它们代表了O抗原的相关内部单-和二-O-乙酰化分布,其目的是定制后期的位点选择性O-乙酰化。后者通过涉及亚氨酸酯糖基化化学的收敛途径获得。对五种保护性mIgG的结合研究表明,没有一种乙酸盐能显着增加广泛的抗体识别能力。然而,五种抗体之一具有独特的结合模式。带IC50在微摩尔至亚微摩尔范围mIgG F22-4例示了显着的紧密结合抗体针对的医学重要性的中性多糖的多样化O-乙酰化和非O-乙酰化的片段。