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Influence of the solvent on the self-assembly of a modified amyloid beta peptide fragment. I. Morphological investigation

Castelletto, V., Hamley, I.W., Harris, P.J.F., Olsson, U. and Spencer, N. (2009) Influence of the solvent on the self-assembly of a modified amyloid beta peptide fragment. I. Morphological investigation. Journal of Physical Chemistry B, 113 (29). pp. 9978-9987. ISSN 1520-6106

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To link to this article DOI: 10.1021/jp902860a

Abstract/Summary

The solvent-induced transition between self-assembled structures formed by the peptide AAKLVFF is studied via electron microscopy, light scattering, and spectroscopic techniques. The peptide is based on a core fragment of the amyloid beta-peptide, KLVFF, extended by two alanine residues. AAKLVFF exhibits distinct structures of twisted fibrils in water or nanotubes in methanol. For intermediate water/methanol compositions, these structures are disrupted and replaced by wide filamentous tapes that appear to be lateral aggregates of thin protofilaments. The orientation of the beta-strands in the twisted tapes or nanotubes can be deduced from X-ray diffraction on aligned stalks, as well as FT-IR experiments in transmission compared to attenuated total reflection. Strands are aligned perpendicular to the axis of the twisted fibrils or the nanotubes. The results are interpreted in light of recent results on the effect of competitive hydrogen bonding upon self-assembly in soft materials in water/methanol mixtures.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences
Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
Interdisciplinary centres and themes > Chemical Analysis Facility (CAF)
ID Code:11098
Uncontrolled Keywords:LIGHT-SCATTERING, ORGANIC-SOLVENT, FIBRILS, SPECTROSCOPY, RIBBONS, AMINO, POLYPEPTIDES, NANOTUBES, PROTEINS, SEGMENTS
Publisher:American Chemical Society

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