Amyloid Formation May Involve α- to β Sheet Interconversion via Peptide Plane Flipping

Milner-White, James E., Watson, James D., Qi, Guoying and Hayward, Steven (2006) Amyloid Formation May Involve α- to β Sheet Interconversion via Peptide Plane Flipping. Structure, 14 (9). pp. 1369-1376. ISSN 0969-2126

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Abstract

# The toxic component of amyloid is not the mature fiber but a soluble prefibrillar intermediate. It has been proposed, from molecular dynamics simulations, that the precursor is composed of a sheet, which converts into the ß sheet of mature amyloid via peptide plane flipping. a sheet, not seen in proteins, occurs as isolated stretches of polypeptide. We show that the a- to ß sheet transition can occur by the flipping of alternate peptide planes. The flip can be described as aRaL?ßß. A search conducted within sets of closely related protein crystal structures revealed that these flips are common, occurring in 8.5% of protein families. The average “aL” conformation found is in an adjacent and less populated region of the Ramachandran plot, as expected if the flanking peptide planes, being hydrogen bonded, are restricted in their movements. This work provides evidence for flips allowing direct a- to ß sheet interconversion.

Item Type: Article
Faculty \ School: Faculty of Science > School of Computing Sciences
Faculty of Science > School of Biological Sciences
Depositing User: Vishal Gautam
Date Deposited: 01 Jun 2011 19:21
Last Modified: 08 Jul 2020 23:42
URI: https://ueaeprints.uea.ac.uk/id/eprint/22041
DOI: 10.1016/j.str.2006.06.016

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