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Selection of Aptamers for Amyloid β-Protein, the Causative Agent of Alzheimer's Disease
Published on: May 13, 2010
In silico assembly of Alzheimer's Abeta16-22 peptide into beta-sheets
Sébastien Santini1, Normand Mousseau, Philippe Derreumaux
1Contribution from the Information Génomique et Structurale, UPR 2589 CNRS, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France.
Abstract:
Recent studies suggest that soluble oligomers of amyloid-forming peptides have toxic effects in cell cultures. In this study, the folding of three Alzheimer's A beta(16-22) peptides have been simulated with the activation-relaxation technique and a generic energy model. Starting from randomly chosen states, the predicted lowest energy structure superposes within 1 A rms deviation from its conformation within the fibrils. This antiparallel structure is found to be in equilibrium with several out-of-register antiparallel beta-sheets and mixed parallel-antiparallel beta-sheets, indicating that full structural order in the fibrils requires larger aggregates. Folding involves the formation of dimers followed by the addition of a monomer and proceeds through a generalized mechanism between disordered and native alignments of beta-strands.
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