Mechanistic investigations on multiproduct β-himachalene synthase from <i>Cryptosporangium arvum</i>
作者:Jan Rinkel、Jeroen S Dickschat
DOI:10.3762/bjoc.15.99
日期:——
geranylgeranyl diphosphate. In-depth mechanistic investigations using isotopically labelled precursors regarding the stereochemical course of both 1,11-cyclisation and 1,3-hydride shift furnished a detailed catalytic model suggesting the molecular basis of the observed low product selectivity. The enzyme's synthetic potential was also exploited in the preparation of sesquiterpene isotopomers, which provided
来自隐孢子虫的细菌萜烯合酶被表征为多产物β-himachalene合酶。体外研究表明,不仅其多种倍半萜烯产品(包括结构要求高的萜烯,长环戊烯和α-longipinene)具有很高的混杂性,而且其底物也是如此,因为在二磷酸香叶基和香叶基香叶基二磷酸中观察到了额外的活性。使用同位素标记的前体进行的有关1,11-环化和1,3-氢化物转变的立体化学过程的深入机理研究提供了详细的催化模型,表明观察到的低产物选择性的分子基础。该酶的合成潜能也被用于倍半萜烯异构体的制备,这为他们的EIMS片段化机理提供了见识。