Improving the stability and catalyst lifetime of the halogenase RebH by directed evolution.

Improving the stability and catalyst lifetime of the halogenase RebH by directed evolution.
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DOI:
10.1002/cbic.201300780
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发表时间:
2014-06-16
期刊:
影响因子:
3.2
通讯作者:
Lewis, Jared C.
Lewis, Jared C.
中科院分区:
生物学3区
文献类型:
--
作者:
Poor, Catherine B.;Andorfer, Mary C.;Lewis, Jared C.

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我们以前报道过卤化酶RebH催化几种杂环和碳环的选择性卤化,但产物产率受到酶不稳定性的限制。在这里,我们使用定向进化来工程化RebH变体,3-LR,其Topt比野生型高5 °C以上,以及3-LSR,其Tm比野生型高18 °C。这些酶显着(高达4倍)提高了色氨酸和几种非天然底物的卤化转化率。RebH进化的初步证明不仅为直接合成应用提供了改进的酶,而且还为进一步的卤化酶进化建立了一个强大的方案。
We previously reported that the halogenase RebH catalyzes selective halogenation of several heterocycles and carbocycles, but product yields were limited by enzyme instability. Here, we use directed evolution to engineer a RebH variant, 3-LR, with a Topt over 5 °C higher than that of wild type, and 3-LSR, with a Tm 18 °C higher than that of wild type. These enzymes provided significantly (up to 4-fold) improved conversions for halogenation of tryptophan and several non-natural substrates. This initial demonstration of RebH evolution not only provides improved enzymes for immediate synthetic applications, but also establishes a robust protocol for further halogenase evolution.
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