Chemical Modification of Oleanene Type Triterpenes and Their Inhibitory Activity against HIV-1 Protease Dimerization.
作者:Chao-mei MA、Norio NAKAMURA、Masao HATTORI
DOI:10.1248/cpb.48.1681
日期:——
Oleanolic acid derivatives with different lengths of 3-O-acidic acyl chains were synthesized and evaluated for their inhibitory activity against HIV-1 protease. The lengths of the acidic chains were optimized to 6 and 8 carbons. Changing a 3-ester bond to an amide bond or dimerization of the triterpenes retained their inhibitory activity against HIV-1 protease. Introduction of an additional acidic chain to C-28 of oleanolic acid increased the inhibitory activity appreciably, though a derivative with only one acidic chain linked at C-28 also showed potent activity against HIV-1 protase.The inhibitory mechanism was proved directly by size exclusion chromatography to be inhibition of dimerization of the enzyme polypeptides. The ester bonds of the triterpene derivatives were found to be stable to lipase under mild alkaline conditons.
The conjugates of some dicarboxylic acid hemiesters of triterpenes which show potent inhibition against human immunodeficiency virus type 1 protease (HIV-1 PR) with a reverse transcriptase inhibitor azidothymidine (AZT) or anti-HIV alkaloid FK 3000 were prepared, and their inhibitory activities were investigated against HIV-induced cytopathic effects (CPE) and HIV-1 PR. Most of the triterpene-AZT conjugates showed potent anti-HIV activity as well as moderate to potent PR inhibitory activity, though AZT itself showed no PR inhibitory activity at all. However, the triterpene-FK 3000 conjugates showed neither PR inhibitory activity nor anti-HIV activity.
本研究制备了一些对人体免疫缺陷病毒 1 型蛋白酶(HIV-1 PR)有强效抑制作用的三萜类化合物的二羧酸半酯与逆转录酶抑制剂氮卓胸苷(AZT)或抗 HIV 生物碱 FK 3000 的共轭物,并研究了它们对 HIV 诱导的细胞病理效应(CPE)和 HIV-1 PR 的抑制活性。大多数三萜类-AZT 共轭物都显示出了强效的抗 HIV 活性以及中等到强效的 PR 抑制活性,但 AZT 本身完全没有 PR 抑制活性。不过,三萜-FK 3000 共轭物既没有抑制 PR 的活性,也没有抗艾滋病毒的活性。