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Dynamic simulation of the mouse prion protein
C Guilbert1, F Ricard, J C Smith
1Section de Biophysique des Protéines et des Membranes, Département de Biologie Cellulaire et Moléculaire, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France.
Abstract:
Conformational flexibility in the prion protein is believed to play a role in prion diseases. Here we examine the dynamic structure of the mouse cellular prion protein using two one-nanosecond molecular dynamics simulations from different initial conditions. The two simulations produce similar results. The overall structure remains close to that determined by nmr spectroscopy, with small deviations arising from loop fluctuation and slight changes in the relative helix positions. The sequence dependence of the fluctuation magnitudes is similar to the variation between the nmr-derived structure solutions. In both simulations, the N-terminal region of the protein forms a short, two-stranded beta-sheet, to which a third strand joins after approximately 100 ps. The additional strand may reflect nucleative properties of the beta-sheet required for disease-related prion conformational change.
Insights
Prion protein flexibility influences prion diseases. Molecular dynamics simulations reveal its dynamic structure, showing a beta-sheet formation that may be key to disease-related conformational changes.
Area of Science:
- Structural biology
- Neuroscience
- Biophysics
Background:
- Prion diseases are linked to conformational flexibility in prion proteins.
- Understanding the dynamic structure of cellular prion protein is crucial for elucidating disease mechanisms.
Purpose of the Study:
- To investigate the dynamic structure of mouse cellular prion protein (PrPC).
- To explore the role of conformational flexibility in prion disease pathogenesis.
Main Methods:
- Utilized two one-nanosecond molecular dynamics simulations.
- Initiated simulations from different starting conditions to ensure result robustness.
Main Results:
- Simulations showed overall structure stability, closely resembling NMR-derived data.
- Observed minor loop fluctuations and shifts in helix positions.
- Identified the N-terminal region forming a two-stranded beta-sheet, with a third strand joining, potentially indicating nucleative properties.
Conclusions:
- The dynamic behavior of mouse prion protein is consistent across simulations.
- The observed beta-sheet formation in the N-terminal region may be critical for the prion protein's conversion to disease-associated forms.