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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
Arrest of beta-amyloid fibril formation by a pentapeptide ligand.
Journal of Biological Chemistry 1996 April 13
Polymerization of amyloid beta-peptide (Abeta) into amyloid fibrils is a critical step in the pathogenesis of Alzheimer's disease. Here, we show that peptides incorporating a short Abeta fragment (KLVFF; Abeta16-20) can bind full-length Abeta and prevent its assembly into amyloid fibrils. Through alanine substitution, it was demonstrated that amino acids Lys16, Leu17, and Phe20 are critical for binding to Abeta and inhibition of Abeta fibril formation. A mutant Abeta molecule, in which these residues had been substituted, had a markedly reduced capability of forming amyloid fibrils. The present data suggest that residues Abeta16-20 serve as a binding sequence duringA beta polymerization and fibril formation. Moreover, the present KLVFF peptide may serve as a lead compound for the development of peptide and non-peptide agents aimed at inhibiting Abeta amyloidogenesis in vivo.
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