三种肉桂酰胺衍生物的制备及其与人血清白蛋白的结合

基于临床上肉桂酰胺类药物的广泛应用及优异性能, 以间羟基肉桂酸为母体, 分别与不同氨基酸反应, 设计合成了3种未见报道的肉桂酰胺类衍生物, 并用MS、IR、¹H NMR、¹³C NMR进行结构表征.采用分子对接技术和荧光光谱法、同步荧光光谱法、紫外-可见光谱法共同研究了3种衍生物分别和人血清白蛋白(HSA)相结合的机理.AutoDock对接显示, 这3种衍生物结合在HSA亚结构域ⅡA(即site Ⅰ)的疏水腔内, 维系衍生物与HSA的主要作用力为氢键和范德华力, 同时还存在着疏水作用.光谱实验结果表明, 在体外生理条件下, 衍生物都与HSA形成复合物, 对HSA内源荧光产生静态猝灭, 且对其构象产生影响.根据不同温度下的热力学函数, 确定主要作用力均是氢键和范德华力.分子对接与实验获得了一致的结果.

Synthesis of Three Cinnamamide Derivatives and Their Interaction Mechanism with Human Serum Albumin

Because of the excellent properties and wide applications of cinnamamide medicines in clinic, three m-hydroxycinnamic acid derivatives were designed and synthetised by the reaction of m-hydroxybenzoic acid with different amino acids, respectively. Their structures were characterized by mass spectrometry, infrared spectroscopy, and nuclear magnetic resonance. The interaction mechanism of derivatives and human serum albumin (HSA) were investigated by AutoDock molecular docking, fluorescence spectroscopy and UV-visible absorption spectroscopy. The results of molecular docking represent that derivatives exist in the hydrophobic pocket of subdomainⅡA(site Ⅰ) of HSA. Hydrogen bonds and van der Waals' forces are main acting forces and hydrophobic force is just the secondary consideration. The spectra experiment results indicate that the derivatives can form complexes with HSA respectively and strongly quench the intrinsic fluorescence of HSA through static quenching at different temperatures. Meanwhile, the secondary structure of HSA is influenced. The change in enthalpy (ΔH) and entropy (ΔS) suggest that hydrogen bonds and van der Waals forces are main acting forces. The molecular docking data are consistent with experimental results.