The Peptaibol Alamethicin induces an rRNA-Cleavage-Associated death in Arabidopsis thaliana
2009
Rippa, Sonia | Adenier, Hervé | Derbaly, Michel | Beven, Laure | Génie Enzymatique et Cellulaire (GEC) ; Université de Technologie de Compiègne (UTC)-Centre National de la Recherche Scientifique (CNRS) | Génomique, développement et pouvoir pathogène (GD2P) ; Université Bordeaux Segalen - Bordeaux 2-Institut National de la Recherche Agronomique (INRA) | Claudio Toniolo (Editeur) | Hans Brückner (Editeur)
International audience
显示更多 [+] 显示较少 [-]英语. 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 Experiments conducted with a synthetic alamethicin analogue, in which all α-aminoisobutyric acid (Aib) residues have been replaced by leucine moieties, showed that the non-coded residues are essential for the ability of the peptaibol to induce rRNA cleavage in Arabidopsis.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.
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