Polymorphism and ultrastructural organization of prion protein amyloid fibrils: an insight from high resolution atomic force microscopy

Journal of Molecular Biology
Maighdlin AndersonIlia V Baskakov

Abstract

Amyloid fibrils were produced from the full-length mouse prion protein (PrP) under solvent conditions similar to those used for the generation of synthetic prions from PrP 89-230. Analysis of the ultrastructure by atomic force microscopy revealed extremely broad polymorphism in fibrils formed under a single growth condition. Fibrils varied with respect to the number of constitutive filaments and the manner in which the filaments were assembled. PrP polymerization was found to show several peculiar features: (i) the higher-order fibrils/ribbons were formed through a highly hierarchical mechanism of assembly of lower-order fibrils/ribbons; (ii) the lateral assembly proceeded stepwise; at each step, a semi-stable fibrillar species were generated, which were then able to enter the next level of assembly; (iii) the assembly of lower into higher-order fibrils occurred predominantly in a vertical dimension via stacking of ribbons on top of each other; (iv) alternative modes of lateral association co-existed under a single growth condition; (iv) the fibrillar morphology changed even within individual fibrils, illustrating that alternative modes of filament assembly are inter-convertible and thermodynamically equivalent. The most predom...Continue Reading

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