The Catalytic Potential of<i>Coptis japonica</i>NCS2 Revealed - Development and Utilisation of a Fluorescamine-Based Assay
作者:Thomas Pesnot、Markus C. Gershater、John M. Ward、Helen C. Hailes
DOI:10.1002/adsc.201200641
日期:2012.11.12
The versatility and potential of a norcoclaurine synthase (NCS) from Coptis japonica NCS2 has been investigated, together with the development and application of a novel fluorescence-based high-throughput assay using nearly forty amines/aldehydes. The stereocontrol exerted by CjNCS2 on selected non-natural substrates has been determined, where the tetrahydroisoquinolines (THIAs) were formed as the
研究了来自黄连NCS2的正月桂氨酸合成酶(NCS)的多功能性和潜力,以及使用近四十种胺/醛的新型荧光高通量测定方法的开发和应用。已经确定了Cj NCS2对选定的非天然底物施加的立体控制,其中天然氢去甲可可碱在> 95%ee中形成了四氢异喹啉(THIAs)作为(1 S)异构体。利用报告的黄藻NCS X射线晶体结构对涉及THIA机制中间体的对接计算,并与Cj结合NCS2筛选结果可进一步了解NCS的作用方式。这些发现表明,除了关键的活性位点残基K122和E110,D141对于酶促转化在机械上也是必不可少的。我们提出的机理进一步支持了NCS对醛底物的超强耐受性,其中醛从酶口袋中伸出。