The Peptaibol Alamethicin induces an rRNA-Cleavage-Associated death in Arabidopsis thaliana - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Book Sections Year : 2009

The Peptaibol Alamethicin induces an rRNA-Cleavage-Associated death in Arabidopsis thaliana

Sonia Rippa
  • Function : Author
Hervé Adenier
  • Function : Author
Michel Derbaly
  • Function : Author

Abstract

The plant-metabolic response to amphipathic peptides produced by the soil fungi of the genus Trichoderma remains largely unknown. The present investigation was undertaken to examine the death process in alamethicin-treated Arabidopsis thaliana plantlets. The rapid death triggered by alamethicin (at 50 μM) was shown to be associated with protein-synthesis arrest and with specific cleavage of 18S and 25S ribosomal RNA. The use of an inhibitor of nitric oxide (NO) synthases and of an NO scavenger suggested that rRNA cleavage was suppressed by NO. Experiments conducted with a synthetic alamethicin analogue, in which all α-aminoisobutyric acid (Aib) residues have been replaced by leucine moieties, showed that the non-coded residues are essential for the ability of the peptaibol to induce rRNA cleavage in Arabidopsis. Our data indicate that further investigations on the mode of action of alamethicin in planta could be of great interest to study the death-signaling pathway associated with rRNA degradation in plants.

Dates and versions

hal-02824835 , version 1 (06-06-2020)

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Sonia Rippa, Hervé Adenier, Michel Derbaly, Laure Beven. The Peptaibol Alamethicin induces an rRNA-Cleavage-Associated death in Arabidopsis thaliana. Peptaibiotics, Verlag Helvetica Chimica Acta, 2009, 3-906390-52-7 978-3-906390-52-9. ⟨10.1002/cbdv.200790116⟩. ⟨hal-02824835⟩
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