Synthesis of 9-phosphonoalkyl and 9-phosphonoalkoxyalkyl purines: Evaluation of their ability to act as inhibitors of Plasmodium falciparum, Plasmodium vivax and human hypoxanthine–guanine–(xanthine) phosphoribosyltransferases
作者:Michal Česnek、Dana Hocková、Antonín Holý、Martin Dračínský、Ondřej Baszczyňski、John de Jersey、Dianne T. Keough、Luke W. Guddat
DOI:10.1016/j.bmc.2011.11.034
日期:2012.1
purine salvage enzyme, hypoxanthine–guanine–(xanthine) phosphoribosyltransferase [HG(X)PRT], catalyses the synthesis of the purine nucleoside monophosphates, IMP, GMP or XMP essential for DNA/RNA production. In protozoan parasites, such as Plasmodium, this is the only route available for their synthesis as they lack the de novo pathway which is present in human cells. Acyclic nucleoside phosphonates
嘌呤挽救酶次黄嘌呤-鸟嘌呤-(黄嘌呤)磷酸核糖基转移酶[HG(X)PRT]催化合成嘌呤核苷单磷酸,IMP,GMP或XMP,这对于DNA / RNA的生产至关重要。在原生动物寄生虫(如疟原虫)中,这是唯一可用于合成的途径,因为它们缺乏人细胞中存在的从头途径。已发现嘌呤核苷单磷酸的类似物无环核苷膦酸酯(ANP)可抑制K i值低至100 nM的恶性疟原虫(Pf)HGXPRT和间日疟原虫(Pv)HGPRT 。他们使用IC 50在基于细胞的测定中阻止寄生虫病值约为1–10μM。设计并合成了具有连接嘌呤碱基和膦酸酯基团的膦酰基烷基和膦酰基烷氧基烷基部分的ANP,以评估该接头对ANP对人和疟疾酶的效力和/或选择性的影响。该数据表明,接头中的可变性以及该接头中氧的位置都会影响结合。人类酶将ANP与K i结合当连接子中的原子数为5或6个原子时,其值为0.5μM。但是,除非在三位中包括氧,否则寄生虫酶对这样的