Reaction of HppE with Substrate Analogues: Evidence for Carbon–Phosphorus Bond Cleavage by a Carbocation Rearrangement
作者:Wei-chen Chang、Steven O. Mansoorabadi、Hung-wen Liu
DOI:10.1021/ja403441x
日期:2013.6.5
(S)-2-hydroxypropylphosphonic acid ((S)-2-HPP) epoxidase (HppE) is an unusual mononuclear non-heme iron enzyme that catalyzes the oxidative epoxidation of (S)-2-HPP in the biosynthesis of the antibiotic fosfomycin. Recently, HppE has been shown to accept (R)-1-hydroxypropylphosphonic acid as a substrate and convert it to an aldehyde product in a reaction involving a biologically unprecedented 1,2-phosphono
(S)-2-羟丙基膦酸 ((S)-2-HPP) 环氧化酶 (HppE) 是一种不寻常的单核非血红素铁酶,可在抗生素磷霉素的生物合成中催化 (S)-2-HPP 的氧化环氧化. 最近,HppE 已被证明接受 (R)-1-羟丙基膦酸作为底物,并在涉及生物学上前所未有的 1,2-膦酰基迁移的反应中将其转化为醛产物。在这项研究中,设计、合成了一系列底物类似物,并将其用作机械探针来研究这种新型酶促转化。所得数据以及从密度泛函理论计算中获得的见解与 HppE 催化的膦酰基迁移的机制一致,该机制涉及碳正离子中间体的形成。像这样,