Structural and Thermodynamic Studies on Cation−Π Interactions in Lectin−Ligand Complexes: High-Affinity Galectin-3 Inhibitors through Fine-Tuning of an Arginine−Arene Interaction
作者:Pernilla Sörme、Pascal Arnoux、Barbro Kahl-Knutsson、Hakon Leffler、James M. Rini、Ulf J. Nilsson
DOI:10.1021/ja043475p
日期:2005.2.1
4-methoxy-2,3,5,6-tetrafluorobenzamido moiety. The structures show that the side chain of Arg144 stacks against the aromatic moiety of the inhibitor, an interaction made possible by a reorientation of the side chain relative to that seen in the LacNAc complex. Based on these structures, synthesis of second generation LacNAc derivatives carrying aromatic amides at 3'-C, followed by screening with a novel fluorescence
人半乳糖凝集素-3 碳水化合物识别域的高分辨率 X 射线晶体结构与 N-乙酰乳糖胺 (LacNAc) 和高亲和力抑制剂甲基 2-乙酰氨基-2-脱氧-4-O- 复合物解析(3-脱氧-3-[4-甲氧基-2,3,5,6-四氟苯甲酰氨基]-β-D-吡喃半乳糖)-β-D-吡喃葡萄糖苷,以深入了解其亲和力增强作用的基础4-甲氧基-2,3,5,6-四氟苯甲酰氨基部分。结构显示 Arg144 的侧链与抑制剂的芳族部分堆叠在一起,这种相互作用通过侧链相对于 LacNAc 复合物中所见的重新定向而成为可能。基于这些结构,合成在 3'-C 处携带芳香酰胺的第二代 LacNAc 衍生物,然后用新型荧光偏振试验进行筛选,已导致鉴定出对 galectin-3 具有进一步增强亲和力的抑制剂(K(d) > 或 = 320 nM)。描述 galectin-3 C 末端与选定抑制剂结合的热力学参数通过等温滴定量热法确定,表明