Alkaloid Biosynthetic Studies

项目总结/摘要 生物碱生物合成研究 C-H活化是将结构和功能双功能蛋白引入天然植物的关键策略之一 化学合成和生物合成的产物。非血红素铁酶是一个关键类别的 C-H活化酶。在这项工作中，我们将进行几个非羟基化的机理研究， 由非血红素铁酶催化的反应，包括内过氧化，环氧化，脱氢， 和氧化C-S键的形成。这些官能团是许多天然药物的生物活性的关键。 产品. 在目标1中，我们关注于α-酮戊二酸依赖性非血红素铁酶的远端类型，因为这是 一种相对未开发的酶。有两种机制模型可以解释 这些酶，我们将使用精心挑选的酶（FtmOx 1，CnsJ和PhyH）对其进行检查。 因为这些酶都有两种完全不同的活性。在目标2中，我们将进行机械化 麦角硫因和卵硫醇生物合成中非血红素铁酶的研究。有两种机械 根据理论计算提出的模型。在这个目标中，使用含有非天然氨基酸的氨基酸， 酶，我们将区分这两种模型。

Project Summary / Abstract Alkaloid biosynthetic studies C-H activation is one of the key strategies to introduce structural and functional diversities into natural products in both chemical synthesis and biosynthesis. Non-heme iron enzymes are one of the key classes of C-H activating enzymes. In this work, we will conduct mechanistic studies of several non-hydroxylation reactions catalyzed by non-heme iron enzymes, including endoperoxidation, epoxidation, dehydrogenation, and oxidative C-S bond formation. These functional groups are key to the biological activities of many natural products. In Aim 1, we focus on the distal type of -ketoglutarate dependent non-heme iron enzymes because this is a relatively unexplored class of enzymes. There are two mechanistic models in explaining the activities of these enzymes and we will examine them using carefully selected enzymes (FtmOx1, CnsJ, and PhyH) because these enzymes all have two completely different activities. In Aim 2, we will conduct mechanistic studies on non-heme iron enzymes in ergothioneine and ovothiol biosynthesis. There are two mechanistic models proposed based on theoretical calculations. In this aim, using unnatural amino acid containing enzymes, we will differentiate between the two models.