Stereochemical Studies on Homoterpene Biosynthesis in Higher Plants; Mechanistic, Phylogenetic, and Ecological Aspects
作者:Andreas Gäbler、Wilhelm Boland、Ute Preiss、Helmut Simon
DOI:10.1002/hlca.19910740820
日期:1991.12.11
examined plant families (Agavaceae, Asclepiadaceae, Asteraceae, Leguminosae, Magnoliaceae, and Saxifragaceae). The enzyme tolerates a wide range of structural modifications at the polar head of 3. Instead of 3, also gcranylacclone 12 and the secondary alcohol 13 can be cleaved to the homoterpene 1 and as yet unidentified carbonyl fragments. The CC bonds within the aliphatic chain of 3 seem to be essential
在高等植物中,两个高同萜烯4,8-二甲基壬基-1,3,7-三烯(1)和4,8,12-三甲基三苯胺-1,3,7,11-teiracnc(2)来源于nerolidol (3)。或香叶菊醇(4)通过其C-骨架离子的氧化裂解而形成。反应进行时,H 8 -C(5)的3完全丢失,并正式生成C 4片段。酶的位点特异性对于迄今检查过的所有植物科(龙舌兰科,萝摩科,菊科,豆科,木兰科和虎耳草科)都是相同的。该酶在3的极性头上可耐受多种结构修饰。gcranylacclone代替312和仲醇13可以裂解为高萜1和尚未鉴定的羰基片段。脂族链3中的CC键似乎对于氧化键裂解以及底物的识别和嵌入酶的活性中心至关重要。饲料诱导的利马豆菜豆叶螨(Tetranychus urticae)感染的利马豆菜豆叶片中1和2的生物合成可能需要事先释放nerolidol(3)或geranyllinalool(4)在断裂反应之前从系统发生