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Calystegines in Calystegia sepium derive from the tropane alkaloid pathway
1Institut für Pharmazeutische Biologie, Martin-Luther-Universität Halle-Wittenberg, Hoher Weg 8, 06120, Halle/Saale, Germany.
Phytochemistry
|October 31, 2001
Summary
Calystegine accumulation in plants is developmentally controlled. Studies using 15N-labelled tropinone in root cultures reveal rapid pseudotropine labeling and faster synthesis of calystegine A(3) compared to B-group calystegines.
Area of Science:
- Plant biochemistry
- Natural product chemistry
- Secondary metabolism
Background:
- Calystegines are tropane alkaloids found in plants like Calystegia sepium.
- Their accumulation and biosynthesis pathways require further elucidation.
Purpose of the Study:
- To quantify calystegine levels in different plant parts.
- To investigate the developmental regulation of calystegine accumulation.
- To trace the biosynthesis of calystegines using isotope labeling.
Main Methods:
- Measurement of calystegines in roots and aerial parts of Calystegia sepium.
- Cultivation of hairy root cultures for controlled experiments.
- Feeding 15N-labelled tropinone to root cultures and analyzing metabolite incorporation over time.
Main Results:
- Calystegine accumulation is developmentally regulated and follows growth patterns in hairy root cultures.
- Pseudotropine was fully labeled with 15N within 2 days.
- Calystegine A(3) showed faster labeling than B-group calystegines.
- 2,7-Dihydroxynortropane incorporated 15N, suggesting its role as a byproduct.
Conclusions:
- Calystegine biosynthesis is linked to the tropane alkaloid pathway.
- The study provides insights into the differential labeling rates of calystegines.
- 2,7-Dihydroxynortropane is proposed as a potential byproduct in this pathway.