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Structure-neurotoxicity relationships of amyloid β-protein oligomers
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Structure-neurotoxicity relationships of amyloid β-protein oligomers
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Structure-neurotoxicity relationships of amyloid β-protein oligomers
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Journal Article
Structure-neurotoxicity relationships of amyloid β-protein oligomers
2009
Overview
Amyloid β-protein (Aβ) oligomers may be the proximate neurotoxins in Alzheimer's disease (AD). \"Oligomer\" is an ill-defined term because many kinds have been reported and they often exist in rapid equilibrium with monomers and higher-order assemblies. We report here results of studies in which specific oligomers have been stabilized structurally, fractionated in pure form, and then studied by using a combination of CD spectroscopy, Thioflavin T fluorescence, EM, atomic force microscopy (AFM), and neurotoxicity assays. Aβ monomers were largely unstructured, but oligomers exhibited order-dependent increases in β-sheet content. EM and AFM data suggest that dimerization and subsequent monomer addition are processes in which significant and asymmetric monomer conformational changes occur. Oligomer secondary structure and order correlated directly with fibril nucleation activity. Neurotoxic activity increased disproportionately (order dependence >1) with oligomer order. The structure-activity correlations reported here significantly extend our understanding of the conformational dynamics, structure, and relative toxicity of pure Aβ oligomers of specific order.
Publisher
National Academy of Sciences,National Acad Sciences
Subject
/ amyloid
/ Amyloid beta-Peptides - chemistry
/ Amyloid beta-Peptides - metabolism
/ Amyloid beta-Peptides - toxicity
/ Amyloid beta-Peptides - ultrastructure
/ Amyloids
/ Animals
/ Cell Survival - drug effects
/ circular dichroism spectroscopy
/ Dimers
/ Monomers
/ Protein Structure, Secondary
/ Rats
/ Structure-Activity Relationship
/ Trimers
