Using (+)-carvone to access novel derivatives of (+)-ent-cannabidiol: The first asymmetric syntheses of (+)-ent-CBDP and (+)-ent-CBDV
作者:Alexandra E. Golliher、Antonio J. Tenorio、Nina O. Dimauro、Nicolas R. Mairata、F. Omar Holguin、William Maio
DOI:10.1016/j.tetlet.2021.152891
日期:2021.3
has a higher affinity to CB1/CB2 receptors than the natural stereoisomer. We have developed an inexpensive, stereoselective route to access ent-CBD derivativesusing (+)-carvone as a starting material. In addition to (+)-CBD, we report the first syntheses of (+)-cannabidivarin, (+)-cannabidiphorol as well as C-6/C-8 homologues.
A candidate cDNA clone for (−)-limonene-7-hydroxylase from Perilla frutescens
作者:Christopher J.D. Mau、Frank Karp、Michiho Ito、Gisho Honda、Rodney B. Croteau
DOI:10.1016/j.phytochem.2009.12.002
日期:2010.3
identification of a single amino acid residue which determines the regiospecificity of oxygenation by these two enzymes. A hybridization strategy provided a cytochromeP450limonenehydroxylasecDNAfrom perilla with which to further evaluate the structural determinants of regiospecificity for oxygenation of the common substrate (-)-limonene. The perilla cDNA was a partial clone of 1550bp (lacking the N-terminal
Plants of the order Ranunculales, especially members of the species Papaver, accumulate a large variety of benzylisoquinoline alkaloids with about 2,500 structures. But only the opium poppy, Papaver somniferum, and Papaver setigerum, are able to produce morphinan alkaloids such as the analgesic morphine or the antitussive codeine. We investigated the molecular basis for this exceptional biosynthetic capability by comparison of alkaloid profiles with gene expression profiles between sixteen different Papaver species and identified one cDNA which exhibits very similar expression pattern to previously isolated cDNAs coding for enzymes in benzylisoquinoline biosynthesis and which showed the highest amino acid identity to reductases in menthol biosynthesis. When expressed, the protein encoded by this cDNA reduced the keto group of salutaridine yielding salutaridinol, an intermediate in morphine biosynthesis. The stereoisomer epi-salutaridinol was not formed. The encoded protein was identified as salutaridine reductase (SalR; EC 1.1.1.248) and it was found to belongs to the family of the short chain dehydrogenases / reductases.
Engineering the haem monooxygenase cytochrome P450cam for monoterpene oxidation
作者:Stephen G. Bell、Rebecca J. Sowden、Luet-Lok Wong
DOI:10.1039/b100290m
日期:——
Monooxygenated terpenes are fine fragrance and flavouring
chemicals, and active site mutants of the haem monooxygenase cytochrome
P450cam which were designed to have improved complementarity
between the substrate binding pocket and the monoterpenes
(+)-α-pinene (1) and S-limonene (2) have been shown to have
greatly enhanced activity for the oxidation of these two substrates, and
the major products, verbenol and isopiperitenol from (1) and (2)
respectively, were formed with high regioselectivity and near-total
stereoselectivity.
synthesis of (−)-menthol, a compound of plant origin, is of great importance because of the high demand for this product and related sustainability issues. However, the total biosynthesis of (−)-menthol from easily available feedstocks like (−)-limonene by engineered microbial hosts is stalled by the poor protein expression or activity of several enzymes from the native (−)-menthol biosynthesis pathway of