Synthesis of two analogues of arachidonic acid and their reactions with 12-Lipoxygenase
作者:Marc Labelle、Jean-Pierre Falgueyret、Denis Riendeau、Joshua Rokach
DOI:10.1016/s0040-4020(01)96002-8
日期:1990.1
Two analogues of arachidonic acid (AA) were synthesized and their reaction with purified porcine 12-lipoxygenase was investigated. The analogue (Z,Z,Z,E)-5,8,11,13 eicosatetraienoic acid was found to be a substrate for the enzyme, being oxidized at one third the rate of AA. The structure of the lipoxygenation product, as well as its absolute stereochemistry, were determined by comparison of the enzymatic
合成了花生四烯酸(AA)的两个类似物,并研究了它们与纯化的猪12-脂氧合酶的反应。模拟(Z,Z,Z,E)-5,8,11,13 eicosatetraienoic酸被认为是对于酶的底物,在AA的三分之一的速率被氧化。脂氧合产物的结构及其绝对立体化学是通过将酶促反应产物与由L-阿拉伯糖制备的已知立体化学合成样品进行比较来确定的。12-脂加氧酶的氧合选择性地发生在碳14处,仅产生S-异构体。第二个AA类似物(Z,Z,Z,E,E)-5,8,11,13,15二十碳五烯酸与酶温育后未能提供任何可检测量的产物。结果表明,15-H(P)ETE的15-加氧功能不是12-脂加氧酶催化的立体选择性14-加氧的必要条件。此外,这些结果支持了AA在脂氧合酶活性位点以马蹄样构象结合的提议。