highlights the direct correlation between CYP71D351 transcript and vindoline levels. In addition, CYP71D351 down-regulation mediated by virus-induced gene silencing reduces vindoline accumulation in leaves and redirects the biosynthetic flux toward the production of unmodified alkaloids at the C-16 position. All these data demonstrate that tabersonine 16-hydroxylation is orchestrated in an organ-dependent manner
A Cytochrome P-450 Monooxygenase Catalyzes the First Step in the Conversion of Tabersonine to Vindoline in Catharanthus roseus
作者:B. St-Pierre、V. De Luca
DOI:10.1104/pp.109.1.131
日期:1995.9.1
localization of other enzymes in the tabersonine to vindoline pathway. However, in contrast to enzymes that catalyze the last four steps of vindoline biosynthesis, enzymes responsible for the first two steps from tabersonine (16-OH and 16-O-methyltransfersase) were detected in C. roseus cell-suspension cultures. These data complement the complex model of vindoline biosynthesis that has evolved with respect
The assembly of (+)‐vincadifformine‐ and (−)‐tabersonine‐derived monoterpenoid indole alkaloids in<i>Catharanthus roseus</i>involves separate branch pathways
作者:Danielle Williams、Yang Qu、Razvan Simionescu、Vincenzo De Luca
DOI:10.1111/tpj.14346
日期:2019.8
leaf-specific tabersonine-3-hydroxylase involved in vindoline biosynthesis. Similarly, O-acetylation of (+)-minovincinine to form (+) echitovenine involves minovincinine-O-acetytransferase. The substrate specificity of V19H and MAT for their respective (+)-enantiomers defines the separate enantiomer-specific pathway involved in (+)-echitovenine biosynthesis and differentiates it from a parallel (-)-enantiomer-specific
A Stereoselective Hydroxylation Step of Alkaloid Biosynthesis by a Unique Cytochrome P450 in Catharanthus roseus
作者:Lesley-Ann Giddings、David K. Liscombe、John P. Hamilton、Kevin L. Childs、Dean DellaPenna、C. Robin Buell、Sarah E. O'Connor
DOI:10.1074/jbc.m111.225383
日期:2011.5
with expression profiles similar to known terpene indole alkaloid biosynthetic genes. Screening of these candidate genes by functional expression in Saccharomyces cerevisiae yielded a unique P450-dependent enzyme that stereoselectively hydroxylates the alkaloids tabersonine and lochnericine at the 19-position of the aspidosperma-type alkaloid scaffold. Tabersonine, which can be converted to either vindoline
Two Tabersonine 6,7-Epoxidases Initiate Lochnericine-Derived Alkaloid Biosynthesis in <i>Catharanthus roseus</i>
作者:Inês Carqueijeiro、Stephanie Brown、Khoa Chung、Thu-Thuy Dang、Manish Walia、Sébastien Besseau、Thomas Dugé de Bernonville、Audrey Oudin、Arnaud Lanoue、Kevin Billet、Thibaut Munsch、Konstantinos Koudounas、Céline Melin、Charlotte Godon、Bienvenue Razafimandimby、Johan-Owen de Craene、Gaëlle Glévarec、Jillian Marc、Nathalie Giglioli-Guivarc’h、Marc Clastre、Benoit St-Pierre、Nicolas Papon、Rodrigo B. Andrade、Sarah E. O’Connor、Vincent Courdavault
DOI:10.1104/pp.18.00549
日期:2018.8
Lochnericine is a major monoterpene indole alkaloid (MIA) in the roots of Madagascar periwinkle (Catharanthus roseus). Lochnericine is derived from the stereoselective C6,C7-epoxidation of tabersonine and can be metabolized further to generate other complex MIAs. While the enzymes responsible for its downstream modifications have been characterized, those involved in lochnericine biosynthesis remain