Investigations into specificity of azepinomycin for inhibition of guanase: Discrimination between the natural heterocyclic inhibitor and its synthetic nucleoside analogues
作者:Saibal Chakraborty、Niti H. Shah、James C. Fishbein、Ramachandra S. Hosmane
DOI:10.1016/j.bmcl.2012.09.053
日期:2012.12
an important enzyme of purine salvage pathway of nucleic acid metabolism, it became necessary to investigate if the nucleoside analogues of the heterocycle azepinomycin, which are likely to be formed in vivo, would be more or less potent than the parent heterocycle. To this end, we have resynthesized both azepinomycin (1) and its two diastereomeric nucleoside analogues (2 and 3), employing a modified
在我们探索天然产物 azepinomycin 及其类似物抑制胍酶(核酸代谢的嘌呤补救途径的重要酶)的构效关系的长期而广泛的计划中,有必要研究杂环 azepinomycin 的核苷类似物是否可能在体内形成,比母体杂环或多或少有效。为此,我们重新合成了 azepinomycin ( 1 ) 及其两个非对映体核苷类似物 ( 2和3)),采用改进的、更有效的程序,并针对哺乳动物鸟苷酸酶对所有三种化合物进行了生化筛选。我们的结果表明,与核苷类似物相比,天然产物抑制胍酶的效力至少是其核苷类似物的 200 倍,观察到的阿西平霉素 ( 1 ) 对兔肝胍酶的K i = 2.5 (±0.6) × 10 -6 M,而化合物2的K i = 1.19 (±0.02) × 10 -4 M和化合物3的K i = 1.29 (±0.03) × 10 -4 M。还需要注意的是,虽然 IC 50 Azepinomycin