Enzymatic epoxidation represents a key biosynthetic transformation in the construction of polyether skeletons. A single flavin-containing monooxygenase, Lsd18, is involved in ionophore polyether lasalocid biosynthesis and participates in the enantioselective epoxidations of the diene precursor. Biotransformation studies utilizing structurally simplified monoolefin analogs with different substitution patterns revealed important structural requirements for the enantiofacial selectivity of Lsd18-catalyzed epoxidations. These results enabled us to propose a substrate binding model of Lsd18, which was applied to the biosynthesis of other polyethers.
酶促环氧化反应是构建聚醚骨架的关键
生物合成转化过程。一种含黄素的单加氧酶 Lsd18 参与了离子型聚醚拉沙洛苷的
生物合成,并参与了二烯前体的对映选择性环氧化反应。利用具有不同取代模式的结构简化的单烯烃类似物进行的
生物转化研究揭示了 Lsd18 催化环氧化作用的对映体选择性的重要结构要求。这些结果使我们能够提出 Lsd18 的底物结合模型,并将其应用于其他聚醚的
生物合成。