Design, Synthesis, and Structure–Activity Relationship Study of Epoxysuccinyl–Peptide Derivatives as Cathepsin B Inhibitors
作者:Xiaoye Zhang、Xiaohong Yang、Hongqiang Wang、Song Li、Kun Guo、Dan Jiang、Junhai Xiao、Di Liang
DOI:10.1248/bpb.b17-00075
日期:——
Cathepsin B is a lysosomal cysteine protease involved in many diseases. The present research demonstrates that derivatives of epoxysuccinyl–peptide are effective and selective cathepsin B inhibitors. We synthesized a series of epoxysuccinyl–peptide derivatives based on the well-known cathepsin B inhibitor E64d. Specifically, we substituted the 2-methylpropane group at the R1 position of E64d with a sulfane, such as ethyl(methyl) sulfane or benzyl(methyl) sulfane. We also designed and synthesized a library of molecules with various substituents at the R2 position of E64d to replace 2-methylbutane. By studying the structure–activity relationships of these newly synthesized molecules as cathepsin B inhibitors, we demonstrated that substituting ethyl(methyl) sulfane for 2-methylbutane (R2) of E64d improves the inhibitory activity and selectivity for cathepsin B inhibition. Our new cathepsin B inhibitors were highly effective and selective.
组织蛋白酶B是一种溶酶体半胱氨酸蛋白酶,参与多种疾病过程。目前的研究表明,环氧琥珀酰肽衍生物是有效的且选择性的组织蛋白酶B抑制剂。我们基于已知的组织蛋白酶B抑制剂E64d合成了一系列环氧琥珀酰肽衍生物。具体来说,我们将E64d的R1位上的2-甲基丙烷基团替换为硫烷,如乙基(甲基)硫烷或苄基(甲基)硫烷。我们还设计并合成了一系列分子,其中E64d的R2位上的2-甲基丁烷被各种取代基替代。通过对这些新合成的分子作为组织蛋白酶B抑制剂的构效关系研究,我们证明了用乙基(甲基)硫烷替代E64d的2-甲基丁烷(R2)可以提高抑制活性并增强对组织蛋白酶B抑制的选择性。我们的新型组织蛋白酶B抑制剂表现出高度的有效性和选择性。