The investigation of recognition events between carbohydrates and proteins, especially the understanding of how spatial factors and binding avidity are correlated, remains a great interest for glycobiology. In this context we have investigated by nanogravimetry (QCM-D) and surface plasmon resonance (SPR), the kinetics and thermodynamics of the interaction between concanavalin A (Con A) and various neoglycopeptide ligands of low molecular weight. Regioselectively addressable functionalized templates (RAFT) have been used as scaffolds for the design of multivalent neoglycopeptides bearing thiol or biotin functions for their anchoring on transducer surfaces. Although these multivalent neoglycopeptide ligands cannot span multiple binding sites within the same Con A protein, they have increased activities relative to their monovalent counterpart. Our results emphasize that the multivalent RAFT ligands function by clustering several lectins, which leads to enhanced affinities.
研究
碳水化合物与蛋白质之间的识别事件,尤其是了解空间因素与结合热度之间的相互关系,仍然是糖
生物学的一大兴趣所在。在此背景下,我们通过纳米重量计(QCM-D)和表面等离子体共振(
SPR)研究了海参素 A(Con A)与各种低分子量新糖肽
配体之间相互作用的动力学和热力学。区域选择性可寻址功能化模板(RAFT)已被用作设计多价新甘肽的支架,这些新甘肽具有
硫醇或
生物素功能,可锚定在换能器表面。虽然这些多价新甘肽
配体不能跨越同一 Con A 蛋白的多个结合位点,但与单价
配体相比,它们的活性有所提高。我们的研究结果表明,多价 RAFT
配体是通过集聚多个凝集素来发挥作用的,从而提高了亲和力。