Enantioselective Phenol Coupling by Laccases in the Biosynthesis of Fungal Dimeric Naphthopyrones
作者:Sebastian Obermaier、Wiebke Thiele、Leon Fürtges、Michael Müller
DOI:10.1002/anie.201903759
日期:2019.7
that are often formed by dimerization through oxidative phenol coupling. Hindered rotation around the biaryl bond can cause axial chirality. In nature, dimerizations are catalyzed by oxidative enzymes such as laccases. This class of enzymes is known for non‐specific oxidase reactions while inherent enantioselectivity is hitherto unknown. Here, we describe four related fungal laccases that catalyze γ‐naphthopyrone
联芳基化合物是普遍存在的代谢产物,通常是通过氧化苯酚偶合通过二聚作用形成的。绕联芳基键的旋转受阻会引起轴向手性。在自然界中,二聚作用是由诸如漆酶的氧化酶催化的。这类酶因非特异性氧化酶反应而闻名,而固有的对映选择性迄今仍是未知的。在这里,我们描述了四个相关的真菌漆酶,它们以区域和阻转选择性的方式催化γ-萘并吡喃二聚体。体外测定表明,三种酶具有很高的P选择性(ee > 95%),而一种酶则显示出显着的柔韧性。对M-或P的选择性预配置的二聚体根据反应条件而有所不同。例如,较低的酶浓度主要产生(P)-类芥子碱A,而 较高浓度的M阻转异构体受到青睐。这些结果证明了以前被认为仅包含非选择性氧化酶的一类酶的固有对映选择性。