Physical basis of amyloid fibril polymorphism.

Physical basis of amyloid fibril polymorphism.
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DOI:
10.1038/s41467-018-03164-5
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发表时间:
2018-02-16
影响因子:
16.6
通讯作者:
Fändrich M
Fändrich M
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Close W;Neumann M;Schmidt A;Hora M;Annamalai K;Schmidt M;Reif B;Schmidt V;Grigorieff N;Fändrich M

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Polymorphism is a key feature of amyloid fibril structures but it remains challenging to explain these variations for a particular sample. Here, we report electron cryomicroscopy-based reconstructions from different fibril morphologies formed by a peptide fragment from an amyloidogenic immunoglobulin light chain. The observed fibril morphologies vary in the number and cross-sectional arrangement of a structurally conserved building block. A comparison with the theoretically possible constellations reveals the experimentally observed spectrum of fibril morphologies to be governed by opposing sets of forces that primarily arise from the β-sheet twist, as well as peptide–peptide interactions within the fibril cross-section. Our results provide a framework for rationalizing and predicting the structure and polymorphism of cross-β fibrils, and suggest that a small number of physical parameters control the observed fibril architectures. Amyloid fibril structures can display polymorphism. Here the authors reveal the cryo-EM structures of several different fibril morphologies of a peptide derived from an amyloidogenic immunoglobulin light chain and present a mathematical analysis of physical factors that influence fibril polymorphism.
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