Local orientational disorder in peptide fibrils probed by a combination of residue-specific13C–18O labelling, polarised infrared spectroscopy and molecular combing

Abstract

A novel combination of site-specific isotope labelling, polarised infrared spectroscopy and molecular combing reveals local orientational ordering in the fibril-forming peptide YTIAALLSPYSGGRADS. Use of13C–18O labelled alanine residues demonstrates that the N-terminal end of the peptide is incorporated into the cross-beta structure, while the C-terminal end shows orientational disorder. © 2012 The Royal Society of Chemistry.