Incorporation of deuterium-labelled analogs of isopentenyl diphosphate for the elucidation of the stereochemistry of rubber biosynthesis
作者:Andrew A. Scholte、John C. Vederas
DOI:10.1039/b515750a
日期:——
prepared to investigate the detailed stereochemicalcourse of addition of C5 units during rubber biosynthesis in Hevea brasiliensis and Parthenium argentatum. These analogs were incorporated into the cis-polyisoprene chain by rubber transferase in rubber particles, and the stereochemistry was determined by 2H-NMR analysis of the polymer or of levulinic acid derivatives obtained from its ozonolytic degradation
The Biosynthetic Gene Cluster for Sestermobaraenes—Discovery of a Geranylfarnesyl Diphosphate Synthase and a Multiproduct Sesterterpene Synthase from
<i>Streptomyces mobaraensis</i>
作者:Anwei Hou、Jeroen S. Dickschat
DOI:10.1002/anie.202010084
日期:2020.11.2
A biosyntheticgeneclusterfromStreptomycesmobaraensis encoding the first cases of a bacterial geranylfarnesyldiphosphatesynthase and a type I sesterterpenesynthase was identified. The structures of seven sesterterpenes produced by these enzymes were elucidated, including their absolute configurations. The enzyme mechanism of the sesterterpenesynthase was investigated by extensive isotope labeling
鉴定出来自茂原链霉菌的生物合成基因簇,编码第一批细菌香叶基法呢基二磷酸合酶和 I 型二倍萜合酶。阐明了这些酶产生的七种二倍萜的结构,包括它们的绝对构型。通过广泛的同位素标记实验研究了二倍萜合酶的酶机制。
On the mechanism of ophiobolin F synthase and the absolute configuration of its product by isotopic labelling experiments
作者:Zhiyang Quan、Jeroen S. Dickschat
DOI:10.1039/d0ob01470b
日期:——
An ophiobolin F synthase homolog was discovered fromAspergilluscalidoustus CBS121601. The cyclisation mechanism of this terpene synthase was investigated by extensive isotopic labelling experiments and the absolute configuration of its product ophiobolin F was elucidated by enantioselective deuteration.
从Aspergillus calidoustus CBS121601中发现了 ophiobolin F 合酶同源物。通过广泛的同位素标记实验研究了该萜烯合酶的环化机制,并通过对映选择性氘化阐明了其产物蛇毒蛋白 F 的绝对构型。
Mechanistic Studies on Trichoacorenol Synthase from
<i>Amycolatopsis benzoatilytica</i>
作者:Jan Rinkel、Jeroen S. Dickschat
DOI:10.1002/cbic.201900584
日期:2020.3.16
Isotopic labeling experiments performed with a newly identified bacterial trichoacorenolsynthase established a 1,5-hydride shift occurring in the cyclization mechanism. During EI-MS analysis, major fragments of the sesquiterpenoid were shown to arise via cryptic hydrogen movements. Therefore, the interpretation of earlier results regarding the cyclization mechanism obtained by feeding experiments
Stereochemistry of the carbon to carbon bond formation in the biosynthesis of polyprepenyl chains with Z double bonds. Studies with undecaprenyl-pyrophosphate synthetase