Springer Online Journal Archives 1860-2000
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.
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