Fiche publication
Date publication
décembre 2019
Journal
Biochimica et biophysica acta. Biomembranes
Auteurs
Membres identifiés du Cancéropôle Est :
Pr BECHINGER Burkhard
,
Dr KICHLER Antoine
Tous les auteurs :
Marquette A, Leborgne C, Schartner V, Salnikov E, Bechinger B, Kichler A
Lien Pubmed
Résumé
Viral protein R (Vpr) is a small accessory protein of 96 amino acids that is present in Human and simian immunodeficiency viruses. Among the very different properties that Vpr possesses we can find cell penetrating capabilities. Based on this and on its capacity to interact with nucleic acids we previously investigated the DNA transfection properties of Vpr and subfragments thereof. We found that fragments of the C-terminal helical domain of Vpr are able to deliver efficiently plasmid DNA into different cell lines. As the amphipathic helix may play a role in the interactions with membranes, we investigated whether insertion of a proline residue in the α-helix modifies the transfection properties of Vpr. Unexpectedly, we found that the resulting Vpr55-82 Pro70 peptide was even more efficient than wild type Vpr55-82 in the gene delivery assays. Using circular dichroism, light scattering and solid-state NMR techniques, we characterized the secondary structure and interactions of Vpr and several mutants with model membranes. A model is proposed where the proline shifts the dissociation equilibrium of the peptide-cargo complex and thereby its endosomal release.
Mots clés
Amphipathic peptide, Cell penetrating peptide, DNA transfection, Membrane interactions, Solid state NMR, Viral protein R
Référence
Biochim Biophys Acta Biomembr. 2019 Dec 6;:183149
