Functional Characterization of Premnaspirodiene Oxygenase, a Cytochrome P450 Catalyzing Regio- and Stereo-specific Hydroxylations of Diverse Sesquiterpene Substrates
作者:Shunji Takahashi、Yun-Soo Yeo、Yuxin Zhao、Paul E. O'Maille、Bryan T. Greenhagen、Joseph P. Noel、Robert M. Coates、Joe Chappell
DOI:10.1074/jbc.m703378200
日期:2007.10
these reactions could occur via a single, multifunctional cytochrome P450 or some combination of cytochrome P450s and a dehydrogenase. We report here the characterization of a single cytochrome P450 enzyme, Hyoscyamus muticus premnaspirodiene oxygenase (HPO), that catalyzes these successive reactions at carbon 2 (C-2) of the spirane substrate. HPO also catalyzes the equivalent regio-specific (C-2) hydroxylation
Solavetivone 是一种有效的抗真菌植物抗毒素,通过推定的区域特异性和立体特异性羟基化作用衍生自 vetispirane 型倍半萜烯 premnaspirodiene,然后进行二次氧化以产生 α,β-不饱和酮。从机制上讲,这些反应可以通过单一的多功能细胞色素 P450 或细胞色素 P450 与脱氢酶的某种组合发生。我们在此报告了单个细胞色素 P450 酶,Hyoscyamus muticus premnaspirodiene 加氧酶 (HPO) 的表征,它在螺环底物的碳 2 (C-2) 处催化这些连续反应。HPO 还催化几种 eremophilane 型(萘烷环系统)倍半萜烯(例如 5-epi-aristolochene)的等效区域特异性 (C-2) 羟基化。而且,HPO 显示了与其他倍半萜烯羟化酶的有趣比较。5-表-马兜铃二羟化酶 (EAH) 在催化上不同于 HPO,它首先在 C-1