From conversion to aggregation: protofibril formation of the prion protein.
The ability to diagnose and treat prion diseases is limited by our current understanding of the conversion process of the protein from healthy to harmful isoform. Whereas the monomeric, benign species is well characterized, the misfolded conformations responsible for infectivity and neurodegeneration remain elusive. There is mounting evidence that fibrillization intermediates, or protofibrils, but not mature fibrils or plaques, are the pathogenic species in amyloid diseases. Here, we use molecular dynamics to simulate the conversion of the prion protein. Molecular dynamics simulation produces a scrapie prion protein-like conformation enriched in beta-structure that is in good agreement with available experimental data. The converted conformation was then used to model a protofibril by means of the docking of hydrophobic patches of the template structure to form hydrogen-bonded sheets spanning adjacent subunits. The resulting protofibril model provides a non-branching aggregate with a 3(1) axis of symmetry that is in good agreement with a wide variety of experimental data; importantly, it was derived from realistic simulation of the conversion process.
DeMarco
Mari L
ML
Biomolecular Structure and Design Program, Department of Medicinal Chemistry, University of Washington, Seattle, WA 98195-7610, USA.
Daggett
Valerie
V
D000595:Amino Acid Sequence; D006863:Hydrogen-Ion Concentration; D007091:Image Processing, Computer-Assisted; D008854:Microscopy, Electron; D008958:Models, Molecular; D016297:Mutagenesis, Site-Directed; D010446:Peptide Fragments / Q000737:chemistry; D011328:Prions / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure; D011487:Protein Conformation; D021122:Protein Subunits / Q000737:chemistry
D010446:Peptide Fragments; D011328:Prions; D021122:Protein Subunits