In the previous paper (Bull. Korean Chem. Soc., 2011, 32, 2997), the hybrid molecules between $\alpha}$-lipoic acid (ALA) and polyphenols (PPs) connected with neutral 2-(2-aminoethoxy)ethanol linker (linker-1) showed new biological activity such as butyrylcholinesterase (BuChE) inhibition. In order to increase the binding affinity of the hybrid compounds to cholinesterase (ChE), the neutral 2-(2-aminoethoxy)ethanol (linker 1) was switched to the cationic 2-(piperazin-1-yl)ethanol linker (linker 2). The $IC_50}$ values of the linker-2 hybrid molecules for BuChE inhibition were lower than those of linker-1 hybrid molecules (except 9-2) and they also had the same great selectivity for BuChE over AChE (> 800 fold) as linker-1 hybrid molecules. ALA-acetyl caffeic acid (10-2, ALA-AcCA) was shown as an effective inhibitor of BuChE ($IC_50}=0.44\pm}0.24\mu}M$). A kinetic study using 7-2 showed that it is the same mixed type inhibition as 7-1. Its inhibition constant (Ki) to BuChE is $4.3\pm}0.09\mu}M$.
在前一篇文章(Bull. Korean Chem. Soc., 2011, 32, 2997)中,通过中性2-(2-
氨基乙氧基)
乙醇连接剂(连接剂-1)连接的
α-硫辛酸(A
LA)和多
酚(PPs)的复合分子显示出新的
生物活性,如丁酰
胆碱酯酶(BuChE)抑制作用。为了提高复合物对
胆碱酯酶(ChE)的结合亲和力,中性2-(2-
氨基乙氧基)
乙醇(连接剂1)被替换成阳离子型2-(
哌嗪-1-基)
乙醇连接剂(连接剂2)。连接剂2复合分子对BuChE抑制的IC50值低于连接剂1复合分子(除了9-2),并且它们对BuChE相对于
乙酰胆碱酯酶(AChE)的选择性同样很高(大于800倍),如同连接剂1复合分子。A
LA-乙酰基
咖啡酸(10-2,A
LA-AcCA)被证明是一种有效的BuChE
抑制剂(IC50=0.44±0.24μM)。使用7-2的动态研究表明,它与7-1一样是混合型抑制。它对BuChE的抑制常数(Ki)是4.3±0.09μM。