Plant Physiol. Drug Metab Dispos
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Plant Physiology 83:475-478 (1987)
© 1987 American Society of Plant Biologists

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Metabolism and Enzymology

Enzymic Synthesis of Caffeoylglucaric Acid from Chlorogenic Acid and Glucaric Acid by a Protein Preparation from Tomato Cotyledons 1

Dieter Strack, Wiltrud Gross, Victor Wray and Lutz Grotjahn

Botanisches Institut der Universität zu Köln, Gyrhofstrasse 15, D-5000 Köln 41, Federal Republic of Germany, Gesellschaft für Biotechnologische Forschung (GBF), Mascheroder Weg 1, D-3300 Braunschweig, Federal Republic of Germany

The phenylpropane metabolism of tomato (Lycopersicon esculentum Mill) cotyledons was investigated. The HPLC analysis revealed two hydroxycinnamic-acid conjugates as major components, identified as chlorogenic acid (5-O-caffeoylquinic acid) and caffeoylglucaric acid (2-O- or 5-O-caffeoyl-glucaric acid). Quantitative analyses indicated a precursor-product relationship between the chlorogenic and caffeoylglucaric acids. Protein preparations from tomato cotyledons were found to catalyze the formation of caffeoylglucaric acid with chlorogenic acid as acyl donor and free glucaric acid as acceptor molecule. This enzyme activity, possibly to be classified as hydroxycinnamoylquinic acid:glucaric acid hydroxycinnamoyltransferase, acts together with hydroxycinnamoyl-CoA: quinic acid hydroxycinnamoyltransferase.

1 Supported by the Deutsche Forschungsgemeinschaft.




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 Proc. Natl. Acad. Sci. USAHome page
A. X. Li and J. C. Steffens
An acyltransferase catalyzing the formation of diacylglucose is a serine carboxypeptidase-like protein
PNAS, June 6, 2000; 97(12): 6902 - 6907.
[Abstract] [Full Text] [PDF]


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Copyright © 1987 by the American Society of Plant Biologists