Structure and Biocatalytic Scope of Coclaurine N-Methyltransferase.

Structure and Biocatalytic Scope of Coclaurine N-Methyltransferase.
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DOI:
10.1002/anie.201805060
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发表时间:
2018-08-13
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Micklefield J
Micklefield J
中科院分区:
其他
文献类型:
--
作者:
Bennett MR;Thompson ML;Shepherd SA;Dunstan MS;Herbert AJ;Smith DRM;Cronin VA;Menon BRK;Levy C;Micklefield J

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苯基异喹啉生物碱(Benzylisoquinoline alkaloids, BIAs)是一类结构多样的植物次生代谢物,已被用于开发镇痛药、抗生素、抗肿瘤药物和其他治疗药物。BIAs的生物合成是通过一条从酪氨酸到(S)‐网状烯的共同途径进行的,这条途径在这一点上发生了分歧。coclurine N - methyltransferase (CNMT)是合成(S) - reticulene途径中的关键酶,其安装的N -甲基取代基对许多BIAs的生物活性至关重要。在本文中,我们描述了CNMT的第一个晶体结构,它与诱变研究一起定义了酶的活性位点结构。CNMT的特异性也通过一系列天然和合成底物以及辅助因子类似物进行了探索。本研究的知识可用于生成生产BIAs或合成衍生物所需的改进CNMT变体。
Benzylisoquinoline alkaloids (BIAs) are a structurally diverse family of plant secondary metabolites, which have been exploited to develop analgesics, antibiotics, antitumor agents, and other therapeutic agents. Biosynthesis of BIAs proceeds via a common pathway from tyrosine to (S)‐reticulene at which point the pathway diverges. Coclaurine N‐methyltransferase (CNMT) is a key enzyme in the pathway to (S)‐reticulene, installing the N‐methyl substituent that is essential for the bioactivity of many BIAs. In this paper, we describe the first crystal structure of CNMT which, along with mutagenesis studies, defines the enzymes active site architecture. The specificity of CNMT was also explored with a range of natural and synthetic substrates as well as co‐factor analogues. Knowledge from this study could be used to generate improved CNMT variants required to produce BIAs or synthetic derivatives.
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