Synthesis and protein binding properties of T-antigen containing GlycoPAMAM dendrimers
作者:Myung-Gi Baek、René Roy
DOI:10.1016/s0968-0896(01)00248-6
日期:2002.1
functionalized T-antigen derivative 15, obtained by radical addition of 3-mercaptopropionic acid to allyl disaccharide 10, was conjugated to PAMAM dendritic cores 13-16 by an efficient amide coupling strategy using TBTU. GlycoPAMAM dendrimers having T-antigen residues with 4, 8, 16 and 32 valencies (17-20) were obtained in 73 to 99% yields. Their protein binding properties were demonstrated using peanut
由相应的半乳糖基溴化物(6、7)和烯丙基以优异的产率制备烯丙基O-(β-D-吡喃半乳糖基)-(1-3)-2-乙酰氨基-2-脱氧-α-D-吡喃半乳糖苷(8)。使用Hg(CN)2作为促进剂的2-乙酰氨基-4,6-亚苄基-2-脱氧α-D-吡喃半乳糖苷(5)。化合物5是从N-乙酰基葡糖胺1获得的,其后继的保护基策略和C-4差向异构化是关键步骤。通过将3-巯基丙酸自由基加成到烯丙基二糖10中获得的羧酸官能化T抗原衍生物15,通过使用TBTU的有效酰胺偶联策略与PAMAM树突状核13-16偶联。以73%至99%的产率获得了具有4、8、16和32价(17-20)的T抗原残基的GlycoPAMAM树状聚合物。使用花生花生凝集素和小鼠单克隆IgG抗体证明了它们的蛋白质结合特性。较高价的结合物产生更强的结合相互作用,表明簇效应。这些g糖PAMAM缀合物对抗体-包被抗原相互作用的抑制潜力比单体T抗原残基的抑制潜力提高了3800倍(10)。