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• W2422742893 abstract "To clarify the mechanisms involved in amyloid formation in Finnish-type familial amyloidosis (FAF), we have tested the in vitro fibrillogenicity of synthetic wild-type and mutated gelsolin peptide analogs and studied the fragmentation patterns of gelsolin in the circulation of FAF patients with the Asn-187 or Tyr-187 gelsolin mutation. Fibril formation of synthetic peptides having sequence homology with wild-type or mutant gelsolins was monitored by Congo-red staining and polarization microscopy, negative staining electron microscopy and quantitative thioflavine-T fluorometry. Immunoblotting with anti-gelsolin and amyloid-specific antibodies and sequence analyses were used to study the fragmentation pattern of gelsolin. Ultrastructurally amyloid-like fibrils were formed from mutant Asn-187 and Tyr-187 gelsolin peptides. Fluorometric analysis revealed highly accelerated fibril formation from the mutant peptides as compared with the corresponding wild-type peptides. Addition of mercaptoethanol alone or in combination with dithiotreitol tended to enhance fibril formation of the 9-mer and 11-mer Asn peptides. Blocking of the C-terminal carboxyl of the mutant Asn-187 gelsolin182-192 peptide by amidation increased amyloidogenicity. The Tyr-187 gelsolin mutation, corresponding to the naturally occurring mutation in the Danish subtype of FAF, required acidic conditions to form fibrils meeting the criteria of amyloid. In FAF patients, in addition to the full-sized gelsolin, a series of lower-molecular mass C-terminal fragments of gelsolin (70,000-45,000 Da) was found in the circulation. In homozygous FAF(Asn-187) the 65-kDa fragment containing the amyloid forming region and the 55-kDa fragment, devoid of that region, was the major gelsolin species in the plasma. The results indicate that the 65-kDa gelsolin fragment derived by alpha-gelsolinase cleavage at the mutation-induced novel proteolysis site Arg172-Ala173 represents the putative circulating precursor protein of tissue amyloid in FAF and that the Asp187Asn/Tyr substitution in gelsolin creates a conformation that is highly fibrillogenic." @default.
• W2422742893 created "2016-06-24" @default.
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• W2422742893 date "2003-08-01" @default.
• W2422742893 modified "2023-10-10" @default.
• W2422742893 title "Fibrillogenesis in gelsolin-related familial amyloidosis" @default.
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• W2422742893 doi "https://doi.org/10.1080/13506129.2003.12088564" @default.
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