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Redirection of flux through the phenylpropanoid pathway by increased glucosylation of soluble intermediates

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JournalPlanta
DatePublished - Sep 2008
Issue number4
Volume228
Number of pages8
Pages (from-to)609-616
Original languageEnglish

Abstract

The phenylpropanoid pathway is used in biosynthesis of a wide range of soluble secondary metabolites including hydroxycinnamic acid esters, flavonoids and the precursors of lignin and lignans. In Arabidopsis thaliana a small cluster of three closely related genes, UGT72E1-E3, encode glycosyltransferases (GTs) that glucosylate phenyl-propanoids in vitro. This study explores the effect of constitutively over-expressing two of these GTs (UGT72E1 and E3) in planta using the CaMV-35S promoter to determine whether phenylpropanoid homeostasis can be altered in a similar manner to that achieved by over-expression of UGT72E2 as previously reported. The data show that impact of over-expressing UGT72E3 in leaves is highly similar to that of UGT72E2 in that the production of massive levels of coniferyl and sinapyl alcohol 4-O-glucosides and a substantial loss in sinapoyl malate. In contrast, the over-expression of UGT72E1 in leaves led only to minimal changes in coniferyl alcohol 4-O-glucoside and no effect was observed on sinapoyl malate levels. In roots, overexpression of both UGTs led to some increase in the accumulation of the two glucosides. The cell specificity expression of the whole UGT72E gene cluster was investigated and interestingly only UGT72E3 was found to be wound and touch responsive.

    Research areas

  • coniferyl alcohol glucoside, ferulic acid glucoside, glucosyltransferases, phenylpropanoids, sinapoyl malate, sinapyl alcohol glucoside, ARABIDOPSIS-THALIANA, LIGNIN BIOSYNTHESIS, GLUCOSYLTRANSFERASE, IDENTIFICATION, GLYCOSYLTRANSFERASES, METABOLISM, GENES, ACID, ALDEHYDE, ENCODES

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