New Tools for Molecular Imaging of Redox Metabolism: Development of a Fluorogenic Probe for 3α-Hydroxysteroid Dehydrogenases
作者:Dominic J. Yee、Vojtech Balsanek、Dalibor Sames
DOI:10.1021/ja039799f
日期:2004.3.3
which guided the synthesis of a focused array of compounds. Subsequently, seven compounds were selected (1-7) on the basis of their optical and chemical (stability) properties and were submitted to a screen against a panel of dehydrogenase enzymes. Probe 5 was found to be highly selective for bacterial, rat, and human 3alpha-HSD enzymes. The kinetic parameters were obtained for human 3alpha-HSD enzyme
为 3alpha-羟基类固醇脱氢酶 (3alpha-HSD) 开发了一种新的荧光底物,包括与重要生理功能(雄激素失活、神经类固醇激活)有关的人类酶。虽然酮 5 不发荧光,但相应的醇表现出高荧光,最大发射波长为 510 nm,从而构成氧化还原光开关。这项研究从酮醇光开关的化学概念开始,它指导了一系列化合物的合成。随后,根据它们的光学和化学(稳定性)特性选择了七种化合物 (1-7),并针对一组脱氢酶进行筛选。发现探针 5 对细菌、大鼠和人类 3alpha-HSD 酶具有高度选择性。获得了人类 3alpha-HSD 酶(2 型同工酶,AKR 1C3;Km = 2.5 muM,kcat = 8.2 min-1)的动力学参数。值得注意的是,与前列腺中可能的生理底物 5alpha-二氢睾酮(5alpha-DHT,Km = 26 muM,kcat = 0.25 min-1,图 4)的比较表明,合成探针 5