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Cited by 261

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Comparison of Alzheimer Aβ(1–40) and Aβ(1–42) amyloid fibrils reveals similar protofilament structures

Open access
Schmidt, Matthias, Sachse, Carsten, Richter, Walter, Xu, Chen, Fändrich, Marcus, Grigorieff, Nikolaus·2009·Proceedings of the National Academy of Sciences

Abstract

We performed mass-per-length (MPL) measurements and electron cryomicroscopy (cryo-EM) with 3D reconstruction on an Aβ(1–42) amyloid fibril morphology formed under physiological pH conditions. The data show that the examined Aβ(1–42) fibril morphology has only one protofilament, although two protofilaments were observed with a previously studied Aβ(1–40) fibril. The latter fibril was resolved at 8 Å resolution showing pairs of β-sheets at the cores of the two protofilaments making up a fibril. Detailed comparison of the Aβ(1–42) and Aβ(1–40) fibril structures reveals that they share an axial twofold symmetry and a similar protofilament structure. Furthermore, the MPL data indicate that the protofilaments of the examined Aβ(1–40) and Aβ(1–42) fibrils have the same number of Aβ molecules per cross-β repeat. Based on this data and the previously studied Aβ(1–40) fibril structure, we describe a model for the arrangement of peptides within the Aβ(1–42) fibril.

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Metadata

Authors
Schmidt, M., Sachse, C., Richter, W., Xu, C., Fändrich, M., & Grigorieff, N.
Venue
Proceedings of the National Academy of Sciences
Published
2009-11-24
Volume
106
Issue
47
Pages
19813-19818
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W1980709154
Cited by
261
References
3
FWCI
10.63
Type
journal article
Language
en
Open access
green

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The paper
Schmidt, M., Sachse, C., Richter, W., Xu, C., Fändrich, M., & Grigorieff, N. (2009). Comparison of Alzheimer Aβ(1–40) and Aβ(1–42) amyloid fibrils reveals similar protofilament structures. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.0905007106

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