Analogs of iso-azepinomycin as potential transition-state analog inhibitors of guanase: Synthesis, biochemical screening, and structure–activity correlations of various selectively substituted imidazo[4,5-e][1,4]diazepines
作者:Saritha Tantravedi、Saibal Chakraborty、Niti H. Shah、James C. Fishbein、Ramachandra S. Hosmane
DOI:10.1016/j.bmc.2013.06.069
日期:2013.9
transition state analog inhibitor of guanase, does not represent the true transition state of the enzyme-catalyzed reaction as closely as does iso-azepinomycin, wherein the 6-hydroxy group of azepinomycin has been translocated to the 5-position. Based on this hypothesis, and assuming that iso-azepinomycin would bind to guanase at the same active site as azepinomycin, several analogs of iso-azepinomycin
胍酶是核酸代谢嘌呤补救途径的重要酶,其抑制作用对病毒、细菌和癌症治疗具有有益意义。本文描述的工作基于这样一个假设,即阿西平霉素,一种杂环天然产物和所谓的胍酶过渡态类似物抑制剂,并不像异阿西平霉素那样代表酶催化反应的真实过渡态,其中 6 azepinomycin 的 - 羟基已转移到 5 位。基于这一假设,并假设ISO -azepinomycin将绑定在相同的活性位点的azepinomycin以鸟嘌呤酶,几个类似物异-azepinomycin 被设计并成功合成,以初步了解配体的胍酶结合位点周围的疏水和亲水位点。具体而言,类似物被设计为探索异氮杂霉素的N1、N3和N4氮原子以及O 5氧原子附近的疏水袋(如果有的话)。使用哺乳动物胍酶进行这些类似物的生化抑制研究。我们的结果表明 (1) 增加 O 5附近的疏水性导致负面影响,(2) 将疏水性从 N3 转移到 N1 也会导致抑制降低,(3) 增加 N3