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Biosynthesis of cucurbitacins in Bryonia dioica seedlings
L Cattel1, G Balliano, O Caputo
1Istituto di Chimica Farmaceutica Applicata dell'Universita' di Torino, Italy.
Abstract:
The biosynthesis of cucurbitacins during the seed germination of Bryonia dioica was studied by analysis of the cucurbitacin-triterpenoid fraction and by tracer experiments with acetate-[2- (14)C]. Isolation of 10alpha-cucurbita-5,24-dien-3beta-ol (9a), the simplest tetracyclic triterpene with a cucurbitane skeleton, supports the view that (9a) is the general precursor of cucurbitacins. Moreover, following the tracer experiments, cucurbitacin E (1a) was the first cucurbitacin formed, whereas the less oxygenated bryodulcosigenin (4a) was not detectable during germination of the plant. In the course of the present investigation, a new pentacyclic triterpene, isomultiflorenol (11a) (possible precursor of bryonolic acid (5a)), was also isolated.
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