Enzymatic nitrile hydrolysis catalyzed by nitrilase ZmNIT2 from maize. An unprecedented β-hydroxy functionality enhanced amide formation
作者:Chandrani Mukherjee、Dunming Zhu、Edward R. Biehl、Rajiv R. Parmar、Ling Hua
DOI:10.1016/j.tet.2006.04.069
日期:2006.6
To explore the synthetic potential of nitrilase ZmNIT2 from maize, the substrate specificity of this nitrilase was studied with a diverse collection of nitriles. The nitrilase ZmNIT2 showed high activity for all the tested nitriles except benzonitrile, producing both acids and amides. For the hydrolysis of aliphatic, aromatic nitriles, phenylacetonitrile derivatives and dinitriles, carboxylic acids
为了探索玉米中腈水解酶ZmNIT2的合成潜力,研究了该腈水解酶的底物特异性,并收集了多种腈。腈水解酶ZmNIT2对除苄腈以外的所有测试腈均显示高活性,同时生成酸和酰胺。对于脂族,芳族腈,苯乙腈衍生物和二腈的水解,羧酸是主要产物。出乎意料的是,发现酰胺是腈水解酶ZmNIT2催化的β-羟基腈水解的主要产物。酶-底物复杂中间体中羟基和氮之间的氢键不利于氨的损失和酰基-酶中间体的形成,后者进一步水解为酸,