Replica exchange molecular dynamics of the thermodynamics of fibril growth of Alzheimers A < inf> 42 peptide
Document Type
Article
Publication Date
8-14-2011
Abstract
The growth of amyloid fibrils is studied by replica exchange molecular dynamics in an implicit solvent. Our data indicate that extremely long simulation times (at least a few hundred ns) are necessary to study the thermodynamics of fibril elongation in detail. However some aspects of the aggregation process are already accessible on the time scales available in the present study. A peak in the specific heat indicates a docking temperature of Tdock ≈ 320 K. Irreversible locking requires lower temperatures with the locking temperature estimated as Tlock ≈ 280 K. In our simulation the fibril grows from both sides with the C-terminal of the incoming monomer attaching to the C-terminal of the peptides in the fibril forming a -sheet on the fibril edge. Our simulation indicates that the C-terminal is crucial for aggregation. © 2011 American Institute of Physics.
Publication Title
Journal of Chemical Physics
Recommended Citation
Han, M.,
&
Hansmann, U.
(2011).
Replica exchange molecular dynamics of the thermodynamics of fibril growth of Alzheimers A < inf> 42 peptide.
Journal of Chemical Physics,
135(6).
http://doi.org/10.1063/1.3617250
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/8915