- PMID:
22128151
- Authors:
- Sauve S, Buijs D, Gingras G, Aubin Y
- Title:
- Interactions between the Conserved Hydrophobic Region of the Prion Protein and Dodecylphosphocholine Micelles.
- Journal:
- J Biol Chem. 2012 Jan 13;287(3):1915-22. Epub 2011 Nov 29.
- Abstract:
- The three-dimensional structure of PrP110-136, a peptide encompassing the conserved hydrophobic region of the human prion protein, has been determined at high resolution in dodecylphosphocholine micelles by NMR. The results support the conclusion that the (Ctm)PrP, a transmembrane form of the prion protein, adopts a different conformation than the reported structures of the normal prion protein determined in solution. Paramagnetic relaxation enhancement studies with gadolinium-diethylenetriaminepentaacetic acid indicated that the conserved hydrophobic region peptide is not inserted symmetrically in the micelle, thus suggesting the presence of a guanidium-phosphate ion pair involving the side chain of the terminal arginine and the detergent headgroup. Titration of dodecylphosphocholine into a solution of PrP110-136 revealed the presence of a surface-bound species. In addition, paramagnetic probes located the surface-bound peptide somewhere below the micelle-water interface when using the inserted helix as a positional reference. This localization of the unknown population would allow a similar ion pair interaction.