Structure-energy relationships for a small group of pyranose and septanose mono-saccharide ligands are developed for binding to Concanavalin A (ConA). The affinity of ConA for methyl “manno” β-septanoside 7 was found to be higher than any of the previously reported mono-septanoside ligands. Isothermal titration calorimetry (ITC) in conjunction with docking simulations and quantum mechanics/molecular mechanics (QM/MM) modeling established the specific role of binding enthalpy in the structure–energy relations of ConA bound to natural mono-saccharides and unnatural mono-septanosides. An important aspect in the differential binding among ligands is the deformation energy required to reorganize internal hydroxyl groups upon binding of the ligand to ConA.
我们研究了一小部分
吡喃糖和庚糖
单糖配体的结构与能量关系,以确定它们与康那维林A(ConA)的结合。我们发现,康那维林A与甲基“甘露”β-庚糖苷7的亲和力高于之前报道的任何单庚糖
配体。等温滴定热法(ITC)与对接模拟和量子力学/分子力学(QM/MM)建模相结合,确定了结合焓在康那维林A与天然
单糖和非天然单庚糖苷的结构与能量关系中的特定作用。
配体之间差异结合的一个重要方面是
配体与康那维林A结合时
重组内部羟基所需的变形能。