Structure-Guided Synthesis and Mechanistic Studies Reveal Sweetspots on Naphthyl Salicyl Hydrazone Scaffold as Non-Nucleosidic Competitive, Reversible Inhibitors of Human Ribonucleotide Reductase
作者:Sarah E. Huff、Faiz Ahmad Mohammed、Mu Yang、Prashansa Agrawal、John Pink、Michael E. Harris、Chris G. Dealwis、Rajesh Viswanathan
DOI:10.1021/acs.jmedchem.7b00530
日期:2018.2.8
Ribonucleotide reductase (RR), an established cancer target, is usually inhibited by antimetabolites, which display multiple cross-reactive effects. Recently, we discovered a naphthyl salicyl acyl hydrazone-based inhibitor (NSAH or E-3a) of human RR (hRR) binding at the catalytic site (C-site) and inhibiting hRR reversibly. We herein report the synthesis and biochemical characterization of 25 distinct
核糖核苷酸还原酶(RR)是已确立的癌症靶标,通常被抗代谢物抑制,该抗代谢物表现出多种交叉反应作用。最近,我们发现了基于萘基水杨酰基的人RR(hRR)的抑制剂(NSAH或E - 3a)在催化位点(C-位)结合并可逆地抑制hRR。我们在此报告了25种不同类似物的合成和生化特性。我们基于2.7ÅX射线晶体结构(PDB ID:5TUS),通过对接至hRR的C位点设计了每个类似物。观察到对微小结构变化的广泛耐受性,从而保持了抑制效力。E - 3f(82%的收率)显示了体外IC 50相对于hRR为5.3±1.8μM,使其在该系列中最有效。动力学测定表明,E - 3a,E - 3c,E - 3t和E - 3w通过可逆和竞争模式结合并抑制hRR。建立了对hRR R1亚基的目标选择性,为抑制这种关键酶提供了一种新颖的方法。