Influence of C-terminal truncation of murine Serum amyloid A on fibril structure

Amyloid A (AA) amyloidosis is a systemic protein misfolding disease affecting humans and other vertebrates. While the protein precursor in humans and mice is the acute-phase reactant serum amyloid A (SAA) 1.1, the deposited fibrils consist mainly of C-terminally truncated SAA fragments, termed AA pr...

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Bibliographic Details
Published in:Scientific reports 2017-07, Vol.7 (1), p.6170-8, Article 6170
Main Authors: Rennegarbe, Matthies, Lenter, Inga, Schierhorn, Angelika, Sawilla, Romy, Haupt, Christian
Format: Article
Language:English
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Amyloidosis
C-Terminus
Electron microscopy
Fibrils
Humanities and Social Sciences
Infrared spectroscopy
Molecular modelling
multidisciplinary
Phenotypic variations
Protein folding
Proteins
Science
Science (multidisciplinary)
Spectrum analysis
Transmission electron microscopy
β-Amyloid
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Summary:Amyloid A (AA) amyloidosis is a systemic protein misfolding disease affecting humans and other vertebrates. While the protein precursor in humans and mice is the acute-phase reactant serum amyloid A (SAA) 1.1, the deposited fibrils consist mainly of C-terminally truncated SAA fragments, termed AA proteins. For yet unknown reasons, phenotypic variations in the AA amyloid distribution pattern are clearly associated with specific AA proteins. Here we describe a bacterial expression system and chromatographic strategies to obtain significant amounts of C-terminally truncated fragments of murine SAA1.1 that correspond in truncation position to relevant pathological AA proteins found in humans. This enables us to investigate systematically structural features of derived fibrils. All fragments form fibrils under nearly physiological conditions that show similar morphological appearance and amyloid-like properties as evident from amyloid-specific dye binding, transmission electron microscopy and infrared spectroscopy. However, infrared spectroscopy suggests variations in the structural organization of the amyloid fibrils that might be derived from a modulating role of the C-terminus for the fibril structure. These results provide insights, which can help to get a better understanding of the molecular mechanisms underlying the different clinical phenotypes of AA amyloidosis.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-017-06419-1