Amine Transaminase from <i>Exophiala Xenobiotica</i>—Crystal Structure and Engineering of a Fold IV Transaminase that Naturally Converts Biaryl Ketones
作者:Aline Telzerow、Juraj Paris、Maria Håkansson、Javier González-Sabín、Nicolás Ríos-Lombardía、Martin Schürmann、Harald Gröger、Francisco Morís、Robert Kourist、Helmut Schwab、Kerstin Steiner
DOI:10.1021/acscatal.8b04524
日期:2019.2.1
Amine transaminases are frequently used for the production of chiral amines starting from prochiral ketones. These amines can be applied as active pharmaceutical ingredients or drug precursors. However, there are still limitations to the use of amine transaminases when it comes to bulky ketone substrates, such as biaryl ketones. Using data mining, an (R)-selective amine transaminase from Exophiala
胺转氨酶经常用于从前手性酮开始生产手性胺。这些胺可以用作活性药物成分或药物前体。但是,当涉及大体积的酮底物(例如联芳基酮)时,胺转氨酶的使用仍然存在局限性。使用数据挖掘,一种来自Exophiala xenobiotica的(R)选择性胺转氨酶鉴定出可以将联芳基酮底物自然转化为相应的胺,转化率高达85%,对映选择性极好(> 99%ee)。获得的蛋白质晶体结构的分辨率为1.52Å,这使我们能够解释这种有趣的底物接受度。结构指导的蛋白质工程导致稳定性提高了五倍变体。此外,氨基酸交换T273S增加了活性并拓宽了底物范围,使各种联芳基酮的转化率高达99%以上。1-(4-(吡啶-3-基)苯基)乙酮在75 mM(15 g / L)上的制备性生物转化导致相应胺的分离收率达到96%。