摘要:以L-异亮氨酸(L-ILe)为底物,以异源表达Fe(Ⅱ)/2-酮戊二酸依赖型双加氧酶的重组大肠杆菌BL21/pET28a-ido全细胞作为催化剂,催化合成4-羟基异亮氨酸(4-HIL).基于重组异亮氨酸双加氧酶(IDO)催化异亮氨酸羟基化的性质和条件,在摇瓶水平上对辅因子亚铁离子、α-酮戊二酸(α-KG)及底物浓度进行了单因素优化.获得的最佳反应条件为2g/L FeSO4·7H2O,底物与α-KG摩尔比为1∶1,该条件下反应8h可生成190mmol/L4-HIL.结合摇瓶水平的最优条件,在反应器水平上继续对搅拌速度、菌体浓度等进行优化,实现了对高底物浓度下催化反应的连续调控.在50g/L湿菌体及400r/min转速下可一次转化合成400mmol/L 4-HIL,建立了全细胞催化合成4-羟基异亮氨酸的工艺流程.
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