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Alignment of a model amyloid peptide fragment in bulk and at a solid surface

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Hamley, Ian W., Castelletto, Valeria, Moulton, Claire M., Rodriguez-Perez, Jose, Squires, Adam M., Eralp, Tugce, Held, Georg, Hicks, Matthew R. and Rodger, Alison. (2010) Alignment of a model amyloid peptide fragment in bulk and at a solid surface. Journal of Physical Chemistry B, Vol.114 (No.24). pp. 8244-8254. ISSN 1520-6106

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Official URL: http://dx.doi.org/10.1021/jp101374e

Abstract

The alignment of model amyloid peptide YYKLVFFC is investigated in bulk and at a solid surface using a range of spectroscopic methods employing polarized radiation. The peptide is based on a core sequence of the amyloid beta (A beta) peptide, KLVFF. The attached tyrosine and cysteine units are exploited to yield information on alignment and possible formation of disulfide or dityrosine links. Polarized Raman spectroscopy on aligned stalks provides information on tyrosine orientation, which complements data from linear dichroism (LD) on aqueous solutions subjected to shear in a Couette cell. LD provides a detailed picture of alignment of peptide strands and aromatic residues and was also used to probe the kinetics of self-assembly. This suggests initial association of phenylalanine residues, followed by subsequent registry of strands and orientation of tyrosine residues. X-ray diffraction (XRD) data from aligned stalks is used to extract orientational order parameters from the 0.48 nm reflection in the cross-beta pattern, from which an orientational distribution function is obtained. X-ray diffraction on solutions subject to capillary flow confirmed orientation in situ at the level of the cross-beta pattern. The information on fibril and tyrosine orientation from polarized Raman spectroscopy is compared with results from NEXAFS experiments on samples prepared as films on silicon. This indicates fibrils are aligned parallel to the surface, with phenyl ring normals perpendicular to the surface. Possible disulfide bridging leading to peptide dimer formation was excluded by Raman spectroscopy, whereas dityrosine formation was probed by fluorescence experiments and was found not to occur except under alkaline conditions. Congo red binding was found not to influence the cross-beta XRD pattern.

Item Type:

Journal Article

Subjects:

Q Science > QD Chemistry
Q Science > QP Physiology

Divisions:

Faculty of Science > Chemistry

Library of Congress Subject Headings (LCSH):

Amyloid, Amyloid beta-protein, Self-assembly (Chemistry)

Journal or Publication Title:

Journal of Physical Chemistry B

Publisher:

American Chemical Society

ISSN:

1520-6106

Official Date:

24 June 2010

Dates:

Date	Event
24 June 2010	Published

Volume:

Vol.114

Number:

No.24

Number of Pages:

Page Range:

pp. 8244-8254

Identification Number:

10.1021/jp101374e

Status:

Peer Reviewed

Publication Status:

Published

Access rights to Published version:

Restricted or Subscription Access

Funder:

Engineering and Physical Sciences Research Council (EPSRC), MAX Laboratory, Seventh Framework Programme (European Commission) (FP7)

Grant number:

EP/F048114/1 (EPSRC), EP/G026203/1 (EPSRC), 511/3-261 (ML), FP7/2007-2013 (FP7), 226716 (FP7)

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