Chemoenzymatic synthesis of L-3,4-dimethoxyphenyl-alanine and its analogues using aspartate aminotransferase as a key catalyst
作者:Jinhai Yu、Jing Li、Shuangyan Cao、Ting Wu、Shuiyun Zeng、Hongjuan Zhang、Junzhong Liu、Qingcai Jiao
DOI:10.1016/j.catcom.2018.10.033
日期:2019.2
In this study, a chemoenzymatic synthesis method for the production of L-3,4-dimethoxyphenyl-alanine and its analogues from phenylpyruvate derivatives was developed. The aspartate aminotransferase from Escherichia coli was engineered by error prone PCR and the improved variants were identified. When 3, 4-dimethoxy phenylpyruvate was added by fed-batch on a preparative scale, L-3,4-dimethoxyphenyl-alanine
在这项研究中,开发了一种化学酶法合成苯丙酮酸衍生物来生产L-3,4-二甲氧基苯基丙氨酸及其类似物的方法。通过易错PCR对大肠杆菌的天冬氨酸转氨酶进行了工程改造,并鉴定了改良的变体。当以制备规模通过补料分批加入3,4-二甲氧基苯基丙酮酸时,形成L-3,4-二甲氧基苯基丙氨酸,转化率为95.4%,ee> 99%,其中最佳的天冬氨酸转氨酶变体为催化剂。这项研究提供了一种利用工程天冬氨酸转氨酶生产甲氧基取代的苯丙氨酸的有效方法。