The 118-135 peptide lot the human prion protein forms amyloid fibrils and induces liposome fusion

被引:79
作者
Pillot, T
Lins, L
Goethals, M
Vanloo, B
Baert, J
Vandekerckhove, J
Rosseneu, M [1 ]
Brasseur, R
机构
[1] Univ Ghent, Dept Biochem, Lab Lipoprot Chem, B-9000 Ghent, Belgium
[2] State Univ Ghent VIB, B-9000 Ghent, Belgium
[3] Fac Sci Agron Etat Gembloux, Ctr Biophys Mol Numer, Gembloux, Belgium
[4] Katholieke Univ Leuven, Interdisciplinary Res Ctr, Louvain, Belgium
关键词
prion protein; synthetic peptide; alpha-helix; membrane fusion; amyloid fibrils;
D O I
10.1006/jmbi.1997.1382
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The prion protein (PrPC) is a glycoprotein of unknown function normally found at the surface of neurons and of glial cells. It is involved in diseases such as bovine spongiform encephalopathy, and Creutzfeldt-Jakob disease in the human, where PrPC is converted into an altered form (termed PrPSc). PrPSc is highly resistant towards proteolytic degradation and accumulates in the central nervous system of affected individuals. By analogy with the pathological events occuring during the development of Alzheimer's disease, controverses still exist regarding the relationship between amyloidogenesis, prion aggregation and neuronal loss. To unravel the mechanism of PrP neurotoxicity and understand the interaction of PrP with cellular membranes, a series of natural and variant peptides spanning residues 118 to 135 of PrP was synthesized. The potential of these peptides to induce fusion of unilamellar lipid vesicles was investigated. According to computer modeling calculations, the 120 to 133 domain of PrP is predicted to be a tilted lipid-associating peptide, and to insert in a oblique way into a lipid bilayer through its N-terminal end. In addition to amyloidogenic properties exhibited in vitro by these peptides, peptide-induced vesicle fusion was demonstrated by several techniques, including lipid-and core-mixing assays. Elongation of the 120 to 133 peptide towards the N- and C-terminal ends of the PrP sequence showed that the 118 to 135 PrP peptide has maximal fusogenic properties, while the variant peptides had no effect. Due to their high hydrophobicity, all peptides tested were able to interact with liposomes to induce leakage of encapsulated calcein. We demonstrate also that the propensity of the peptides to fold as an alpha-helix increases their fusogenic activity, thus accounting for the maximal fusogenic activity of the most stable helix at residues 118 to 135. These data suggest that, by analogy with the C-terminal domain of the beta-amyloid peptide, the fusogenic properties exhibited by the prion peptides might contribute to the neurotoxicity of these peptides by destabilizing cellular membranes. (C) 1997 Academic Press Limited.
引用
收藏
页码:381 / 393
页数:13
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