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Atomic-resolution structure of a disease-relevant A?(1?42) amyloid fibril #MMPMID27469165
Wälti MA; Ravotti F; Arai H; Glabe CG; Wall JS; Böckmann A; Güntert P; Meier BH; Riek R
Proc Natl Acad Sci U S A 2016[Aug]; 113 (34): E4976-84 PMID27469165show ga
Alzheimer?s disease is the most prevalent neurodegenerative disease still with no known cure. The disease is characterized by the development of extracellular plaques and intracellular neurofibrillary tangles. The senile plaques consist mainly of the peptide amyloid-? (A?) in aggregated form, called amyloid fibrils. It is believed that the A? amyloid fibrils play an important role in disease progression and cell-to-cell transmissibility, and small A? oligomers are often assumed to be the most neurotoxic species. Here, we determined the 3D structure of a disease-relevant A?(1?42) fibril polymorph combining data from solid-state NMR spectroscopy and mass-per-length measurements from EM. The 3D structure is composed of two molecules per fibril layer, forming a double-horseshoe?like cross??-sheet entity with maximally buried hydrophobic side chains.