Substrate specificity analysis and inhibitor design of homoisocitrate dehydrogenase
作者:Takashi Yamamoto、Kentaro Miyazaki、Tadashi Eguchi
DOI:10.1016/j.bmc.2006.11.008
日期:2007.2.1
as a coenzyme. Substrate specificity of two homoisocitrate dehydrogenases derived from Deinococcus radiodurans and Saccharomyces cerevisiae was analyzed using a series of synthetic substrate analogs, which indicated a relatively broad substrate specificity of these enzymes. Based on the substrate specificity, 3-hydroxyalkylidene- and 3-carboxyalkylidenemalate derivatives were designed as a specific
同异柠檬酸脱氢酶参与真菌,酵母,某些原核细菌和古细菌中l-赖氨酸生物合成的α-氨基己二酸途径。该酶使用NAD(+)作为辅酶催化(2R,3S)-高异柠檬酸的氧化脱羧成2-氧代己二酸酯。使用一系列合成的底物类似物分析了源自Deinococcus radiodurans和酿酒酵母的两种均异柠檬酸脱氢酶的底物特异性,这表明这些酶的底物特异性相对较宽。基于底物特异性,将3-羟基亚烷基-和3-羧基亚烷基-苹果酸酯衍生物设计为均异柠檬酸脱氢酶的特异性抑制剂。合成抑制剂显示出中等的竞争抑制活性,并且(R,在合成的抑制剂中,Z)-3-羧丙基亚甲基丙烯酸酯的抑制作用最大。因此,均异柠檬酸脱氢酶似乎优先识别均异柠檬酸的延伸构象。