The biosynthesis of rosmarinic acid in suspension cultures of Coleus blumei |
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Authors: | Maike Petersen Elisabeth Häusler Juliane Meinhard Barbara Karwatzki Claudia Gertlowski |
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Institution: | (1) Institut für Entwicklungs- und Molekularbiologie der Pflanzen, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf 1, FRG |
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Abstract: | Suspension cultures of Coleus blumei accumulate very high amounts of rosmarinic acid, an ester of caffeic acid and 3,4-dihydroxyphenyllactate, in medium with elevated sucrose concentrations. Since the synthesis of this high level of rosmarinic acid occurs in only five days of the culture period, the activities of the enzymes involved in the biosynthesis are very high. Therefore all the enzymes necessary for the formation of rosmarinic acid from the precursors phenylalanine and tyrosine could be isolated from cell cultures of Coleus blumei: phenylalanine ammonia-lyase, cinnamic acid 4-hydroxylase, hydroxycinnamoyl:CoA ligase, tyrosine aminotransferase, hydroxyphenylpyruvate reductase, rosmarinic acid synthase and two microsomal 3- and 3-hydroxylases. The main characteristics of these enzymes of the proposed biosynthetic pathway of rosmarinic acid will be described.Abbreviations DHPL
3,4-dihydroxyphenyllactate
- DHPP
3,4-dihydroxyphenylpyruvate
- pHPL
4-hydroxyphenyllactate
- pHPP
4-hydroxyphenylpyruvate
- RA
rosmarinic acid |
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Keywords: | Coleus blumei (suspension cultures) hydroxycinnamic acid esters phenylalanine rosmarinic acid secondary metabolism tyrosine |
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