Engineering the Active Site of an (
<i>S</i>
)‐Selective Amine Transaminase for Acceptance of Doubly Bulky Primary Amines
作者:Henrik Land、Federica Ruggieri、Anna Szekrenyi、Wolf‐Dieter Fessner、Per Berglund
DOI:10.1002/adsc.201901252
日期:2020.2.21
A protein engineering approach for expanding the substrate scope of the (S)‐selective Chromobacterium violaceum amine transaminase is presented. Amino acid residues in the small binding pocket of the active site were targeted in order to increase the pocket size for acceptance of primary amines bearing two bulky groups. A highly sensitive fluorescence assay was then used to evaluate the generated enzyme
提出了一种蛋白质工程方法,可扩大(S)选择性紫色杆菌色胺转氨酶的底物范围。靶向活性位点小结合口袋中的氨基酸残基,以增加口袋大小,以接受带有两个庞大基团的伯胺。然后使用高灵敏度的荧光分析法评估生成的酶变体对丙基和苄基取代的筛选底物的活性。最佳变体L59A / F88A已成功用于在不同条件和底物负载条件下的1,2-二苯乙胺动力学拆分中。变体L59A / F88A与ee生成对映体纯的(R)-1,2-二苯乙胺在所有测试条件下> 99%。当使用20-30%(v / v)DMSO作为助溶剂时,该变体显示出最佳活性,该变体也具有合成疏水化合物的广阔前景。L59A / F88A变体为合成手性胺的现有催化剂工具箱提供了重要补充,因为它是第一个发表的(S)-选择性胺转氨酶,对氨基苄基取代的伯胺具有活性。