Enzymatic Synthesis of Caged NADP Cofactors: Aqueous NADP Photorelease and Optical Properties
作者:Charles P. Salerno、Douglas Magde、Andrew P. Patron
DOI:10.1021/jo9917846
日期:2000.6.1
The synthesis of caged NADP analogues 18, 19, and 20 has been accomplished by utilizing the transglycosidase activity of solubilized NAD glycohydrolase (porcine brain) to incorporate caged nicotinamides 2, 3, and 4 into NADP. The synthesis of several nicotinamides modified at the carboxamide with o-nitrobenzyl photolabile groups is demonstrated as well as their potential for enzymatic transglycosidation
笼状NADP类似物18、19和20的合成已通过利用溶解的NAD糖水解酶(猪脑)的转糖苷酶活性将笼状烟酰胺2、3和4掺入NADP来完成。已证明了在羧酰胺上被邻硝基苄基光不稳定基团修饰的几种烟酰胺的合成及其酶促糖苷化的潜力。这些结果进一步证明了将位阻底物直接酶促糖苷化成NAD(P)的可行性,尽管发现高烟酰胺类似物水溶性是某些类似物提高产量的必要特征。在水性条件下调查笼中类似物的净NADP光释放量,同时评估了类似物及其光副产物的紫外和荧光特性,以与依赖于光学监测酶活性的系统的相容性。开发了高度水溶性的α-甲基-o-硝基苄基8,用于合成20,以提高净NADP的光释放。化合物20表现出高的75%净NADP光释放,而没有大量的紫外线光学发黑或荧光副产物。ESI / MALDI-MS显示类似物18和19主要光生NADP的加合物,具有有害的紫外线和荧光特性。我们的工作强调了α-甲基取代赋予羧酰胺水溶液从邻