Rhodesain (RD) is a parasitic, humancathepsinL (hCatL) like cysteine protease produced by Trypanosoma brucei (T. b.) species and a potential drug target for the treatment of human African trypanosomiasis (HAT). A library of hCatL inhibitors was screened, and macrocyclic lactams were identified as potent RD inhibitors (Ki < 10 nM), preventing the cell-growth of Trypanosoma brucei rhodesiense (IC50
Rhodesain(RD)是寄生的,人组织蛋白酶L(hCatL)等所产生半胱氨酸蛋白酶布氏锥虫(Ť。b。)物种和人非洲锥虫病(HAT)的治疗中的潜在药物靶。筛选了一个hCatL抑制剂库,并将大环内酰胺确定为有效的RD抑制剂(K i <10 nM),从而防止了布氏锥虫(Trypanosoma brucei rhodesiense)的细胞生长(IC 50<400 nM)。建立了针对RD S2和S3口袋的SAR。具有RD的三个共晶结构揭示了该配体类型的非共价结合模式,这是由于结晶过程中催化Cys25氧化为亚磺酸(Cys–SOH)所致。测量了P-糖蛋白的流出比,并确定了大鼠体内的脑渗透率。当在急性HAT模型中进行体内测试时,这些化合物允许的生存天数高达16.25(未经处理的对照组为13.0)。