investigated their inhibitory activities and mechanisms on tyrosinase by using Spectrofluorimetry, 1H and 13C NMR titration and IR spectra. The results of the fluorescence spectra and NMR titrations showed that the thiosemicarbazone moiety formed complexes with copper ions in the active center of the enzyme and played an important role in inhibiting the activities of the target compounds. The 5-functionalization
我们合成了一系列4-或5-官能TCT衍
生物(的1 - 12),并使用分光荧光法,1H和13C NMR滴定和IR光谱研究了它们对
酪氨酸酶的抑制活性和机理。荧光光谱和NMR滴定的结果表明,该
硫半
脲酮部分在酶的活性中心与
铜离子形成络合物,并在抑制目标化合物的活性中起重要作用。5-官能化降低了抑制活性,但是带有甲氧基乙酰基的4-官能化增强了抑制活性,其中甲氧基乙酰基的强大的辅助邻域协同作用增强了并促进了
抑制剂硫原子之间的络合物的形成。
酪氨酸酶的双
铜核。