Protein-Solvent Interfaces in Human Y145Stop Prion Protein Amyloid Fibrils Probed by Paramagnetic Solid-State NMR Spectroscopy
 

Protein-Solvent Interfaces in Human Y145Stop Prion Protein Amyloid Fibrils Probed by Paramagnetic Solid-State NMR Spectroscopy

Publication date: Available online 18 April 2018
Source:Journal of Structural Biology</br>
Author(s): Darryl Aucoin, Yongjie Xia, Theint Theint, Philippe S. Nadaud, Krystyna Surewicz, Witold K. Surewicz, Christopher P. Jaroniec</br>
The C-terminally truncated Y145Stop variant of prion protein (PrP23-144), which is associated with heritable PrP cerebral amyloid angiopathy in humans and also capable of triggering a transmissible prion disease in mice, serves as a useful in vitro model for investigating the molecular and structural basis of amyloid strains and cross-seeding specificities. Here, we determine the protein-solvent interfaces in human PrP23-144 amyloid fibrils generated from recombinant 13C,15N-enriched protein and incubated in aqueous solution containing paramagnetic Cu(II)-EDTA, by measuring residue-specific 15N longitudinal paramagnetic relaxation enhancements using two-dimensional magic-angle spinning solid-state NMR spectroscopy. To further probe the interactions of the amyloid core residues with solvent molecules we perform complementary measurements of amide hydrogen/deuterium exchange detected by solid-state NMR and solution NMR methods. The solvent accessibility data are evaluated in the context of the structural model for human PrP23-144 amyloid.
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