Discovery of Potent Small-Molecule Inhibitors of Ubiquitin-Conjugating Enzyme UbcH5c from α-Santonin Derivatives
作者:Hao Chen、Guozhen Wu、Shuang Gao、Ruihua Guo、Zeng Zhao、Hu Yuan、Shanxiang Liu、Jian Wu、Xiaolong Lu、Xing Yuan、Zongmin Yu、Xianpeng Zu、Ning Xie、Niao Yang、Zhenlin Hu、Qingyan Sun、Weidong Zhang
DOI:10.1021/acs.jmedchem.6b01829
日期:2017.8.24
inactivated UbcH5c by forming a covalent adduct with its active site Cys85. Furthermore, compound 6d exhibited potent anti-inflammatory activity against complete Freund’s adjuvant-induced adjuvant arthritis in vivo. These findings suggest that the novel α-santonin-derived UbcH5c inhibitor 6d is a promising lead compound for the development of new antirheumatoid arthritis (RA) agent.
作为抗肿瘤坏死因子(TNF)-α干预的治疗靶标,UbcH5c是在TNF-α触发的核因子kappa B(NF-κB)激活过程中催化泛素化的关键泛素结合酶之一。在本研究中,从α-桑顿蛋白设计并合成了三个系列类似物,并通过Western印迹和NF-κB荧光素酶法筛选了它们的UbcH5c抑制活性。进一步的BIAcore,凝胶内荧光成像和免疫沉淀分析表明,化合物6d对UbcH5c表现出强大而特异性的抑制作用,超过了阳性化合物1(IJ-5)的抑制作用。机理研究表明,化合物6d通过与其活性位点Cys85形成共价加合物,优先结合UbcH5c并使其失活。此外,化合物6d在体内对完全弗氏佐剂诱导的佐剂关节炎表现出有效的抗炎活性。这些发现表明,新颖的α-桑顿蛋白衍生的UbcH5c抑制剂6d是开发新型抗类风湿关节炎(RA)药物的有前途的先导化合物。