acid (DADH); however, the process through which linear DADH is cyclized to furnish an ABCH ring system remains poorly understood. Based on the reconstitution of the route of the ABCH-containing unit by blending genes/enzymes involved in the biosynthesis of ficellomycin and azinomycins, we report that ABCH formation is completed by an oxidase heterotetramer with the association of a nonribosomal peptide
Ficellomycin、azinomycins 和 vazabitide A 是非
核糖体肽
天然产物,其特征在于
氨基酸单元包含类似的 1- a za b i c yclo [3.1.0] h exane (ABCH) 药效团。该单元源自d i a mino- d ihydroxy- h
庚酸 (
DADH);然而,线性
DADH 环化以提供 ABCH 环系统的过程仍然知之甚少。基于通过混合参与 ficellomycin 和 azinomycins
生物合成的
基因/酶重建含 ABCH 单元的路线,我们报告 ABCH 形成是由氧化酶异四聚体与非
核糖体肽合成酶 (NRPS) 结合完成的。
DADH 前体在大肠杆菌中制备,以产生经过体外处理的缀合物用于从
氨基载体蛋白上卸载的酶促
水解。为了提供
氮丙啶环,
DADH 通过 C7-羟基磺化和
硫酸盐消除偶联环化处理。进一步环化导致氮杂双
环己烷药效团被证明发生在 NRPS