New reactions and products resulting from alternative interactions between the P450 enzyme and redox partners.

New reactions and products resulting from alternative interactions between the P450 enzyme and redox partners.
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P450 酶和氧化还原伙伴之间的替代相互作用产生的新反应和产物

DOI:
10.1021/ja4130302
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发表时间:
2014-03-05
影响因子:
15
通讯作者:
Li S
Li S
中科院分区:
化学1区
文献类型:
--
作者:
Zhang W;Liu Y;Yan J;Cao S;Bai F;Yang Y;Huang S;Yao L;Anzai Y;Kato F;Podust LM;Sherman DH;Li S

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细胞色素P450酶能够催化多种合成有用的反应,例如选择性C-H官能化。替代氧化还原配偶体被广泛用于P450活性的重建,基于这样的假设,即这些辅助蛋白的选择或它们的作用模式不影响P450催化的反应的类型和选择性。在这里,我们提出了一个特殊的例子来挑战这一假设。MycG是一种多功能生物合成P450单加氧酶,负责16元环大环内酯霉素的羟基化和环氧化,当与游离红球菌还原酶结构域RhFRED或工程化红球菌-菠菜杂合还原酶RhFRED-Fdx结合时,显示出催化一系列霉素底物的非天然N-脱甲基化。相比之下,MycG与RhFRED或RhFRED-Fdx还原酶结构域融合仅介导生理氧化。这一发现突出了变体氧化还原伴侣蛋白质-蛋白质相互作用在调节P450酶的催化活性中的更大的潜在作用。
Cytochrome P450 enzymes are capable of catalyzing a great variety of synthetically useful reactions such as selective C–H functionalization. Surrogate redox partners are widely used for reconstitution of P450 activity based on the assumption that the choice of these auxiliary proteins or their mode of action does not affect the type and selectivity of reactions catalyzed by P450s. Herein, we present an exceptional example to challenge this postulate. MycG, a multifunctional biosynthetic P450 monooxygenase responsible for hydroxylation and epoxidation of 16-membered ring macrolide mycinamicins, is shown to catalyze the unnatural N-demethylation(s) of a range of mycinamicin substrates when partnered with the free Rhodococcus reductase domain RhFRED or the engineered Rhodococcus-spinach hybrid reductase RhFRED-Fdx. By contrast, MycG fused with the RhFRED or RhFRED-Fdx reductase domain mediates only physiological oxidations. This finding highlights the larger potential role of variant redox partner protein–protein interactions in modulating the catalytic activity of P450 enzymes.
DOI: 10.1042/bj3080901
发表时间: 1995-06-15
影响因子: 4.1
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