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Phenylpropanoid Metabolism in Suspension Cultures of Vanilla planifolia. Andr. III. Conversion of 4-Methoxycinnamic acids into 4-Hydroxybenzoic acids
Department of Plant Biochemistry, University of Lund.ORCID iD: 0000-0001-8899-5046
1990 (English)In: Plant Physiology, ISSN 0032-0889, E-ISSN 1532-2548, Vol. 94, p. 102-108Article in journal (Refereed) Published
Abstract [en]

Feeding of 4-methoxycinnamic acid, 3,4-dimethoxycinnamicacid and 3,4,5-trimethoxycinnamic acid to cell suspension culturesof Vanilla planifolia resulted in the formation of 4-hydroxybenzoicacid, vanillic acid, and syringic acid, respectively. Thehomologous 4-methoxybenzoic acids were demethylated to thesame products. It is concluded that the side chain degradingenzyme system accepts the 4-methoxylated substrates while thedemethylation occurs at the benzoic acid level. The demethylatingenzyme is specific for the 4-position. Feeding of [10_4Cmethyl]-3,4-dimethoxycinnamic acid revealed that the first stepin the conversion is the glycosylation of the cinnamic acid to itsglucose ester. A partial purification of a UDP-glucose: transcinnamicacid glucosyltransferase is reported. 4-Methoxy substitutedcinnamic acids are better substrates for this enzyme than4-hydroxy substituted cinnamic acid. It is suggested that 4-methoxysubstituted cinnamic acids are intermediates in the biosyntheticconversion of cinnamic acids to benzoic acids in cells ofV. planifolia. 

Place, publisher, year, edition, pages
1990. Vol. 94, p. 102-108
National Category
Biochemistry and Molecular Biology
Research subject
Natural Science, Biochemistry
Identifiers
URN: urn:nbn:se:lnu:diva-581DOI: 10.1104/pp.94.1.102OAI: oai:DiVA.org:lnu-581DiVA, id: diva2:307311
Available from: 2010-04-01 Created: 2010-04-01 Last updated: 2017-12-12Bibliographically approved

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Brodelius, Peter

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