A versatile synthetic procedure to construct series of high- and low-density homo- and heteroglycoclusters is reported. The binding properties of these synthetic multivalent glycoconjugates to concanavalin A (Con A), a model lectin, have been assessed by using a range of competitive and non-competitive binding assays including enzyme-linked lectin assays (ELLA), isothermal titration microcalorimetry (ITC) and surface plasmon resonance (SPR). In all cases, highly dense glycoclusters showed a substantial amplification of the lectin-binding strength in comparison with low-density counterparts. Interestingly, highly-dense glycoligand presentations, regardless of their homo- or heteroglycoligand pattern, furnished similar Con A binding properties, supporting the existence of a synergic effect (heterocluster effect) due to secondary interactions of ânon-activeâ structural motifs in the presence of a certain density of âactiveâ glycoligands.
报告采用了一种多功能合成程序来构建一系列高密度和低密度的同源和异源糖团。通过使用一系列竞争性和非竞争性结合测定法,包括酶联凝集素测定法(EL
LA)、等温滴定微量热测定法(ITC)和表面等离子体共振(
SPR),评估了这些合成多价糖簇与模型凝集素 concanavalin A(Con A)的结合特性。在所有情况下,与低密度糖团相比,高密度糖团的凝集素结合强度都有大幅提高。有趣的是,高密度的配糖体,不管是同源配糖体还是异源配糖体,都具有类似的Con A结合特性,这证明了在一定密度的 "活性 "配糖体存在的情况下,由于 "非活性 "结构基团的次级相互作用而产生的协同效应(异簇效应)的存在。