Separate Sets of Mutations Enhance Activity and Substrate Scope of Amine Dehydrogenase
作者:Robert D. Franklin、Conner J. Mount、Bettina R. Bommarius、Andreas S. Bommarius
DOI:10.1002/cctc.201902364
日期:2020.5.7
average of 2.5‐fold higher activity toward aliphatic ketones and an 8.0 °C increase in melting temperature. L‐AmDH‐TV did not show significant changes in relative activity for different substrates. In contrast, L39A, L39G, A112G, and T133G in varied combinations added to L‐AmDH‐TV changed the shape of the substrate binding pocket. L‐AmDH‐TV was not active on ketones larger than 2‐hexanone. L39A and L39G
将突变引入衍生自嗜热脂肪芽孢杆菌的亮氨酸胺脱氢酶(L‐AmDH)亮氨酸脱氢酶(LeuDH)的目的是提高活性和扩大底物接受度。包括D32A,F101S和C290V在内的三重变体(L‐AmDH‐TV)对脂族酮的活性平均提高了2.5倍,熔融温度提高了8.0°C。L‐AmDH‐TV在不同底物的相对活性方面未显示出显着变化。相反,添加到L‐AmDH‐TV中的L39A,L39G,A112G和T133G的各种组合改变了底物结合袋的形状。L-AmDH-TV在大于2-己酮的酮上不起作用。L39A和L39G可以激活高达2-癸酮的直链酮,并与A112G结合起来可以活化更长的支链酮,包括5-甲基-2-辛酮。