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Effects of the mutations Glu22 to Gln and Ala21 to Gly on the aggregation of a synthetic fragment of the Alzheimer's amyloid β/A4 peptide

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<mark>Journal publication date</mark>14/10/1993
<mark>Journal</mark>Neuroscience Letters
Issue number1
Volume161
Number of pages4
Pages (from-to)17-20
Publication statusPublished
Original languageEnglish

Abstract

We assessed the fibrillogenic properties of synthetic peptides corresponding to residues 13-26 of beta/A4 amyloid, containing either the normal sequence (beta 13 26) or the mutations Glu22 to Gln (beta 13-26Q22) and Ala21 to Gly (beta 13-26G21). The kinetics of aggregation were monitored at 37 degrees C and pH 7.4 by measuring the amount of peptide remaining in solution, using reverse-phase high performance liquid chromatography. Negative stain electron microscopy revealed that all of the peptides formed fibrils. However, beta 13-26Q22 showed greatly accelerated fibril formation compared to the other two. The results suggest that the Q22 mutation confers increased amyloidogenic properties on the beta/A4 peptide, whereas the G21 mutation acts by a different pathogenic mechanism.