| DOI | Trouver le DOI : https://doi.org/10.1016/j.bbamem.2017.01.036 |
|---|
| Auteur | Rechercher : Chen, Xiaochao; Rechercher : Liu, Shutao; Rechercher : Deme, Bruno; Rechercher : Cristiglio, Viviana; Rechercher : Marquardt, Drew1; Rechercher : Weller, Richard; Rechercher : Rao, Pingfan; Rechercher : Wang, Yunqiang; Rechercher : Bradshaw, Jeremy |
|---|
| Affiliation | - Conseil national de recherches du Canada. Technologies de sécurité et de rupture
|
|---|
| Format | Texte, Article |
|---|
| Sujet | cell penetrating peptide; TAT peptide; neutron diffraction; phospholipid |
|---|
| Résumé | The aim of this study is to investigate the interactions between TAT peptides and a neutral DOPC bilayer by using neutron lamellar diffraction. The distribution of TAT peptides and the perturbation of water distribution across the DOPC bilayer were revealed. When compared to our previous study on an anionic DOPC/DOPS bilayer (X. Chen et al., Biochim Biophys Acta. 2013. 1828 (8), 1982–1988), a much deeper insertion of TAT peptides was found in the hydrophobic core of DOPC bilayer at a depth of 6.0 Å from the center of the bilayer, a position close to the double bond of fatty acyl chain. We conclude that the electrostatic attractions between the positively charged TAT peptides and the negatively charged headgroups of phospholipid are not essential for the direct translocation. Furthermore, the interactions of TAT peptides with the DOPC bilayer were found to vary in a concentration-dependent manner. A limited number of peptides first associate with the phosphate moieties on the lipid headgroups by using the guanidinium ions pairing. Then the energetically favorable water defect structures are adopted to maintain the arginine residues hydrated by drawing water molecules and lipid headgroups into the bilayer core. Such bilayer deformations consequently lead to the deep intercalation of TAT peptides into the bilayer core. Once a threshold concentration of TAT peptide in the bilayer is reached, a significant rearrangement of bilayer will happen and steady-state water pores will form. |
|---|
| Date de publication | 2017-05 |
|---|
| Maison d’édition | Elsevier |
|---|
| Dans | |
|---|
| Langue | anglais |
|---|
| Publications évaluées par des pairs | Oui |
|---|
| Numéro NPARC | 23003043 |
|---|
| Exporter la notice | Exporter en format RIS |
|---|
| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
|---|
| Identificateur de l’enregistrement | 49c44c8f-a075-48f9-872e-246009c04c58 |
|---|
| Enregistrement créé | 2018-04-17 |
|---|
| Enregistrement modifié | 2020-03-16 |
|---|
