Cardenolide biosynthesis in chrysomelid beetles

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New cardenolide glycosides from the defence glands of Chrysolinina beetles (Coleoptera :Chrysomelidae)

The composition of the defence secretions of six species of chrysomelid beetles (Chrysolina polita, C. americana, C. grossa, C. herbacea, C. fastuosa, and Oreina gloriosa) belonging to the sub‐tribe Chrysolinina has been investigated. Two known cardenolide aglycones, sarmentogenin (1) and oleandrigenin (23), and fourteen new cardiac glycosides (7–20) have been isolated and their structure established by spectral and chemical methods. Three of the glycosides (18, 19, and 20) are based on a new cardenolide aglycone, namely Δ11‐digitoxigenin. All the new glycosides but 17 contain monosaccharides (e. g. lyxose, ribose, allose) which are rarely encountered in secondary metabolites. Ethanolamine was shown to be present in the secretions of the six species examined, as well as in C. hyperici and in C. coerulans. In the latter, ethanolamine is accompanied by its N‐(γ‐glutamyl) derivative. Copyright © 1988 Wiley‐VCH Verlag GmbH & Co. KGaA, WeinheimSCOPUS: ar.jinfo:eu-repo/semantics/publishe

Toxins in chrysomelid beetles Possible evolutionary sequence from de novo synthesis to derivation from food-plant chemicals

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Sequestration of ingested [14C]senecionine N-oxide in the exocrine defensive secretions of chrysomelid beetles

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Triterpene saponins in the defensive secretion of a chrysomelid beetle, Platyphora ligata

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Triterpene saponin hemi-biosynthesis of a leaf beetle's (Platyphora kollari) defensive secretion

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