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Structural Dynamics of the Amyloid β-Protein Monomer Folding Nucleus
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https://doi.org/10.1021/bi300350pAbstract
Alzheimer's disease (AD) is linked to the aberrant assembly of the amyloid β-protein (Aβ). The (21)AEDVGSNKGA(30) segment, Aβ(21-30), forms a turn that acts as a monomer folding nucleus. Amino acid substitutions within this nucleus cause familial forms of AD. To determine the biophysical characteristics of the folding nucleus, we studied the biologically relevant acetyl-Aβ(21-30)-amide peptide using experimental techniques (limited proteolysis, thermal denaturation, urea denaturation followed by pulse proteolysis, and electron microscopy) and computational methods (molecular dynamics). Our results reveal a highly stable foldon and suggest new strategies for therapeutic drug development.
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