Overexpression in Catharanthus roseus hairy roots of a truncated hamster 3-hydroxy-3-methylglutaryl-CoA reductase gene

Catharanthus roseus (L.) G. Don hairy roots harboring hamster 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR) (EC1.1.1.88) cDNA without membrane-binding domain were evaluated by quantifying the levels of sterols and some indol-alkaloids. Clone 236, with the highest hybridization signal, had the lowe...

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Bibliographic Details
Published inApplied biochemistry and biotechnology Vol. 97; no. 2; pp. 133 - 145
Main Authors Ayora-Talavera, T, Chappell, J, Lozoya-Gloria, E, Loyola-Vargas, V.M
Format Journal Article
LanguageEnglish
Published 2002
Subjects
biosynthesis
campesterol
Catharanthus roseus
complementary DNA
gene overexpression
genes
hamsters
hydroxymethylglutaryl-CoA reductases
indole alkaloids
RNA interference
roots
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Summary:Catharanthus roseus (L.) G. Don hairy roots harboring hamster 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR) (EC1.1.1.88) cDNA without membrane-binding domain were evaluated by quantifying the levels of sterols and some indol-alkaloids. Clone 236, with the highest hybridization signal, had the lowest soluble and microsomal HMGR activity and produced more ajmalicine and catharanthine than the control but had reduced campesterol concentration. Clone 19, with low hybridization signal, had high soluble HMGR activity and produced high levels of campesterol and five to seven times more serpentine than the control but a low level of ajmalicine and no accumulation of catharanthine. These results suggest a possible role for HMGR in indole alkaloid biosynthesis and a possible cosuppression of both the endogenous and foreign HMGR genes in clone 236.
ISSN:0273-2289
1559-0291