Exploring the sequence-structure relationship for amyloid peptides

Kyle L. Morris, Alison Rodger, Matthew R. Hicks, Maya Debulpaep, Joost Schymkowitz, Frederic Rousseau, Louise C. Serpell*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

Amyloid fibril formation is associated with misfolding diseases, as well as fulfilling a functional role. The cross-β molecular architecture has been reported in increasing numbers of amyloidlike fibrillar systems. The Waltz algorithm is able to predict ordered self-assembly of amyloidogenic peptides by taking into account the residue type and position. This algorithm has expanded the amyloid sequence space, and in the present study we characterize the structures of amyloid-like fibrils formed by three peptides identified by Waltz that form fibrils but not crystals. The structural challenge is met by combining electron microscopy, linear dichroism, CD and X-ray fibre diffraction. We propose structures that reveal a cross-β conformation with 'steric-zipper' features, giving insights into the role for side chains in peptide packing and stability within fibrils. The amenity of these peptides to structural characterization makes them compelling model systems to use for understanding the relationship between sequence, self-assembly, stability and structure of amyloid fibrils.

Original languageEnglish
Pages (from-to)275-283
Number of pages9
JournalBiochemical Journal
Volume450
DOIs
Publication statusPublished - 1 Mar 2013
Externally publishedYes

Keywords

  • Amyloid
  • Amyloidogenic peptide
  • Waltz algorithm
  • X-ray fibre diffraction

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