Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Specific Interactions of Clausin, a New Lantibiotic, with Lipid Precursors of the Bacterial Cell Wall

Abstract : We investigated the specificity of interaction of a new type A lantibiotic, clausin, isolated from Bacillus clausii, with lipid intermediates of bacterial envelope biosynthesis pathways. Isothermal calorimetry and steady-state fluorescence anisotropy (with dansylated derivatives) identified peptidoglycan lipids I and II, embedded in dodecylphosphocholine micelles, as potential targets. Complex formation with dissociation constants of ∼0.3 μM and stoichiometry of ∼2:1 peptides/lipid intermediate was observed. The interaction is enthalpy-driven. For the first time, to our knowledge, we evidenced the interaction between a lantibiotic and C55-PP-GlcNAc, a lipid intermediate in the biosynthesis of other bacterial cell wall polymers, including teichoic acids. The pyrophosphate moiety of these lipid intermediates was crucial for the interaction because a strong binding with undecaprenyl pyrophosphate, accounting for 80% of the free energy of binding, was observed. No binding occurred with the undecaprenyl phosphate derivative. The pentapeptide and the N-acetylated sugar moieties strengthened the interaction, but their contributions were weaker than that of the pyrophosphate group. The lantibiotic decreased the mobility of the pentapeptide. Clausin did not interact with the water-soluble UDP-MurNAc- and pyrophosphoryl-MurNAc-pentapeptides, pointing out the importance of the hydrocarbon chain of the lipid target.
Type de document :
Article dans une revue
Liste complète des métadonnées

https://hal-unilim.archives-ouvertes.fr/hal-00697279
Contributeur : Claire Douady <>
Soumis le : mardi 15 mai 2012 - 09:45:14
Dernière modification le : mercredi 16 septembre 2020 - 16:58:07

Lien texte intégral

Identifiants

Collections

Citation

Ahmed Bouhss, Bayan Al-Dabbagh, Michel Vincent, Benoît Odaert, Magali Aumont-Nicaise, et al.. Specific Interactions of Clausin, a New Lantibiotic, with Lipid Precursors of the Bacterial Cell Wall. Biophysical Journal, Biophysical Society, 2009, 97 (5), pp.1390-1397. ⟨10.1016/j.bpj.2009.06.029⟩. ⟨hal-00697279⟩

Partager

Métriques

Consultations de la notice

195