Loblolly pine abietadienol/abietadienal oxidase
<i>PtAO</i>
(CYP720B1) is a multifunctional, multisubstrate cytochrome P450 monooxygenase
作者:Dae-Kyun Ro、Gen-Ichiro Arimura、Stephen Y. W. Lau、Edward Piers、Jörg Bohlmann
DOI:10.1073/pnas.0500825102
日期:2005.5.31
phylogenetic cluster analysis of P450-like ESTs from loblolly pine (Pinus taeda), functional cDNA screening in yeast (Saccharomyces cerevisiae), and in vitro enzyme characterization, we cloned and identified a multifunctional and multisubstrate cytochrome P450 enzyme, CYP720B1 [abietadienol/abietadienal oxidase (PtAO)]. PtAO catalyzes an array of consecutive oxidation steps with several different diterpenol
细胞色素P450单加氧酶(P450)是重要的酶,可产生植物类萜次生代谢产物的巨大结构多样性。在针叶树中,P450参与了一套二萜树脂酸(DRA)的形成。尽管它们在组成型和诱导的油树脂防御中起重要作用,但尚未鉴定出DRA形成的P450基因。通过对火炬松(Pinus taeda)的P450样EST进行系统进化聚类分析,酵母(Saccharomyces cerevisiae)中的功能cDNA筛选以及体外酶表征,我们克隆并鉴定了一种多功能,多底物的细胞色素P450酶CYP720B1 [abietadienol /牛二醛氧化酶(PtAO)]。PtAO在火炬松DRA生物合成中用几种不同的二萜和二萜中间产物催化一系列连续的氧化步骤。重组PtAO氧化了abietadienol,abetiedienal,levopimaradienol,isopimara-7,15-dienol,isoopimara-7,1