Conformational change of a synthetic amyloid analogue des[Ala21,3O]A42 upon binding to octyl glucoside micelles

Ilona Laczkó-Hollósi, Miklós Hollósi, Virginia M.Y. Lee, Henry H. Mantsch

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Abstract

The secondary structure of a synthetic amyloid fragment des [Ala21,30]A42 was studied by circular dichroism and Fourier transformed infrared spectroscopy. Measurements were performed in trifluoroethanol/water and octyl β-d-glucopyranoside solutions. The spectra of the peptide in trifluoroethanol indicate a high percentage of a-helical structure. However, in octyl glucoside, at and above the critical micelle concentration, the peptide adopts a β-sheet conformation. Secondary structure analysis yields a predominant (> 70 %) β-sheet content. Our data suggest that the peptide backbone or polar side groups of des[Ala21,30]A42 interact with the sugar-coated surface of micelles, which promotes an a to β conformational transition.

Original languageEnglish
Pages (from-to)345-348
Number of pages4
JournalEuropean Biophysics Journal
Volume21
Issue number5
DOIs
Publication statusPublished - Nov 1 1992

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Keywords

  • Alzheimer's disease
  • Amyloid A4
  • Conformational change
  • Octyl glucoside

ASJC Scopus subject areas

  • Biophysics

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