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Characterization of pH-Dependent Reversible Self-Assembly of Amyloid Beta 1-40-Coated Gold Colloids

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Effect of beta-sheet propensity on peptide aggregation.

Giovanni Bellesia¹, Joan-Emma Shea

¹Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, USA. gbellesia@chem.ucsb.edu

The Journal of Chemical Physics

|April 17, 2009

Summary

Peptide flexibility influences aggregate structure. Lowering beta-sheet propensity in peptides can reduce fibril formation and promote toxic oligomers implicated in amyloid diseases.

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Area of Science:

Biophysics
Computational Biology
Materials Science

Background:

Beta-sheet aggregates are central to amyloid diseases.
Understanding peptide self-assembly is crucial for disease research.

Purpose of the Study:

Investigate how beta-sheet propensity affects peptide aggregate structures.
Explore the relationship between peptide flexibility and supramolecular assembly.

Main Methods:

Utilized an off-lattice coarse-grained peptide model.
Generated a phase diagram based on temperature and beta-sheet propensity.

Main Results:

High beta-sheet propensity favors fibrillar structures.
Reduced beta-sheet propensity leads to diverse structures: fibrils, beta-barrels, and amorphous aggregates.
Simulations suggest decreased beta-sheet propensity favors toxic oligomer formation.

Conclusions:

Peptide beta-sheet propensity is a key determinant of aggregate morphology.
Findings offer insights into the structural basis of amyloid diseases.
Parallels exist between beta-sheet aggregates and nematic liquid crystals.