The coupled reaction catalyzed by EchB and EchC lead to the formation of the common 2′,3′,5′-trihydroxy-benzene core in echosides biosynthesis
作者:Jing Zhu、Mengyujie Liu、Jingjing Deng、Wang Chen、Deyu Zhu、Jing Duan、Yaoyao Li、Haoxin Wang、Yuemao Shen
DOI:10.1016/j.bbrc.2021.04.087
日期:2021.6
activities. Here we demonstrated a two-enzyme (EchB, a short-chain dehydrogenase/reductase (SDR), and EchC, a nuclear transport factor 2 (NTF2)-like dehydratase) participated transformation from dihydroxybenzoquinone core to 2′,3′,5′-trihydroxy-benzene in the biosynthesis of echosides. Beginning with polyporic acid as substrate, successive steps of reduction-dehydration-reduction cascade catalyzed by EchB-EchC-EchB
p-三联苯代表由非核糖体肽合成酶样 (NRPS 样) 酶生成的独特芳香族天然产物家族。对三联苯骨架形成后,剪裁修饰将产生结构多样性和各种生物活性。在这里,我们展示了一种双酶(EchB,一种短链脱氢酶/还原酶(SDR)和 EchC,一种核转运因子 2(NTF2)样脱水酶)参与从二羟基苯醌核心到 2',3',5' 的转化-三羟基苯在回声苷的生物合成中。以多孔酸为底物,经过体内基因破坏和体外实验,得出了EchB-EchC-EchB催化的还原-脱水-还原级联反应的连续步骤。生物测定实验。这些发现证明了细菌(例如放线菌和伯克霍尔德菌)中 2',3',5'-三羟基-对三联苯的保守合成途径。真菌中的平行途径还有待探索。