[EN] NOVEL INTERMEDIATES FOR THE PREPARATION OF GBS POLYSACCHARIDE ANTIGENS<br/>[FR] NOUVEAUX INTERMÉDIAIRES POUR LA PRÉPARATION D'ANTIGÈNES DE POLYSACCHARIDE GBS
申请人:GLAXOSMITHKLINE BIOLOGICALS SA
公开号:WO2019012476A1
公开(公告)日:2019-01-17
The present invention generally refers to novel intermediate polysaccharide units, useful for the preparation of polysaccharide antigen of GBS Ia, Ib and III; the invention also refers to a process for their preparation and their use as intermediate for the preparation of conjugated derivatives useful in vaccines.
Regioselective Glycosylation Strategies for the Synthesis of Group Ia and Ib
<i>Streptococcus</i>
Related Glycans Enable Elucidating Unique Conformations of the Capsular Polysaccharides
作者:Linda Del Bino、Ilaria Calloni、Davide Oldrini、Maria Michelina Raso、Rossella Cuffaro、Ana Ardá、Jeroen D. C. Codée、Jesús Jiménez‐Barbero、Roberto Adamo
DOI:10.1002/chem.201903527
日期:2019.12.18
polysaccharides share high structural similarity. Both are composed of the same monosaccharide residues and differ only in the connection of the Neu5Acα2-3Gal side chain to the GlcNAc unit, which is a β1-4 linkage in serotype Ia and a β1-3 linkage in serotype Ib. The development of efficient regioselective routes for GlcNAcβ1-3[Glcβ1-4]Gal synthons is described, which give access to different group B Streptococcus
B 组链球菌血清型 Ia 和 Ib 荚膜多糖是疫苗开发的关键目标。尽管它们具有免疫特异性,但这些多糖具有高度的结构相似性。两者均由相同的单糖残基组成,不同之处仅在于 Neu5Acα2-3Gal 侧链与 GlcNAc 单元的连接,在血清型 Ia 中为 β1-4 连接,在血清型 Ib 中为 β1-3 连接。描述了 GlcNAcβ1-3[Glcβ1-4]Gal 合成子的有效区域选择性途径的开发,该途径提供了不同 B 族链球菌 (GBS) Ia 和 Ib 重复单元移码的途径。这些聚糖用于探测两种多糖的构象和分子动力学,突出显示突出的 Neu5Acα2-3Gal 部分在多糖主链上的不同呈现方式,以及 Ib 聚合物相对于 Ia 具有更高的灵活性,这可能会影响表位暴露。