Download MendeleyCryo-EM structures of amyloid-beta filaments with the Arctic mutation (E22G) from human and mouse brains.
Yang, Y., Zhang, W., Murzin, A.G., Schweighauser, M., Huang, M., Lovestam, S., Peak-Chew, S.Y., Saito, T., Saido, T.C., Macdonald, J., Lavenir, I., Ghetti, B., Graff, C., Kumar, A., Nordberg, A., Goedert, M., Scheres, S.H.W.(2023) Acta Neuropathol 145: 325-333
- PubMed: 36611124
- DOI: https://doi.org/10.1007/s00401-022-02533-1
- Primary Citation of Related Structures:
8BFZ, 8BG0, 8BG9 - PubMed Abstract:
The Arctic mutation, encoding E693G in the amyloid precursor protein (APP) gene [E22G in amyloid-β (Aβ)], causes dominantly inherited Alzheimer's disease. Here, we report the high-resolution cryo-EM structures of Aβ filaments from the frontal cortex of a previously described case (AβPParc1) with the Arctic mutation. Most filaments consist of two pairs of non-identical protofilaments that comprise residues V12-V40 (human Arctic fold A) and E11-G37 (human Arctic fold B). They have a substructure (residues F20-G37) in common with the folds of type I and type II Aβ42. When compared to the structures of wild-type Aβ42 filaments, there are subtle conformational changes in the human Arctic folds, because of the lack of a side chain at G22, which may strengthen hydrogen bonding between mutant Aβ molecules and promote filament formation. A minority of Aβ42 filaments of type II was also present, as were tau paired helical filaments. In addition, we report the cryo-EM structures of Aβ filaments with the Arctic mutation from mouse knock-in line App NL-G-F . Most filaments are made of two identical mutant protofilaments that extend from D1 to G37 (App NL-G-F murine Arctic fold). In a minority of filaments, two dimeric folds pack against each other in an anti-parallel fashion. The App NL-G-F murine Arctic fold differs from the human Arctic folds, but shares some substructure.
Organizational Affiliation:
Medical Research Council Laboratory of Molecular Biology, Cambridge, UK.
