Protein arginine N-methyltransferases (PRMTs) selectively replace N–H for N–CH3 at substrate protein guanidines, a post-translational modification important for a range of biological processes, such as epigenetic regulation, signal transduction and cancer progression. Selective chemical probes are required to establish the dynamic function of individual PRMTs. Herein, model inhibitors designed to occupy PRMT binding sites for an arginine substrate and S-adenosylmethionine (AdoMet) co-factor are described. Expedient access to such compounds by modular synthesis is detailed. Remarkably, biological evaluation revealed some compounds to be potent inhibitors of PRMT1, but inactive against CARM1. Docking studies show how prototype compounds may occupy the binding sites for a co-factor and arginine substrate. Overlay of PRMT1 and CARM1 binding sites suggest a difference in a single amino acid that may be responsible for the observed selectivity.
蛋白质精
氨酸 N-甲基转移酶(PR
MTs)可选择性地将底物蛋白质
鸟嘌呤上的 N-H 替换为 N-
CH3,这种翻译后修饰对一系列
生物过程(如表观遗传调控、
信号转导和癌症进展)非常重要。需要选择性
化学探针来确定单个 PR
MTs 的动态功能。本文介绍了为占据精
氨酸底物和
S-腺苷蛋氨酸(AdoMet)辅助因子的 PR
MT 结合位点而设计的模型
抑制剂。详细介绍了通过模块化合成快速获得此类化合物的方法。对接研究显示了原型化合物如何占据辅助因子和精
氨酸底物的结合位点。PR
MT1 和 CARM1 结合位点的重叠表明,单个
氨基酸的差异可能是观察到的选择性的原因。