Fibril structure of amyloid-β(1-42) by cryo-electron microscopy.

Fibril structure of amyloid-β(1-42) by cryo-electron microscopy.
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DOI:
10.1126/science.aao2825
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发表时间:
2017-10-06
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Schröder GF
Schröder GF
中科院分区:
其他
文献类型:
--
作者:
Gremer L;Schölzel D;Schenk C;Reinartz E;Labahn J;Ravelli RBG;Tusche M;Lopez-Iglesias C;Hoyer W;Heise H;Willbold D;Schröder GF

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Amyloids are implicated in neurodegenerative diseases. Fibrillar aggregates of the amyloid-β protein (Aβ) are the main component of the senile plaques found in brains of Alzheimer’s disease patients. We present the structure of an Aβ(1-42) fibril composed of two intertwined protofilaments determined by cryo-electron microscopy (cryo-EM) to 4.0 Å resolution, complemented by solid-state nuclear magnetic resonance (NMR) experiments. The backbone of all 42 residues and nearly all sidechains are well resolved in the EM density map, including the entire N-terminus, which is part of the cross-β structure resulting in an overall "LS"-shaped topology of individual subunits. The dimer interface protects the hydrophobic C-termini from the solvent. The unique staggering of the non-planar subunits results in markedly different fibril ends, termed "groove" and "ridge", leading to different binding pathways on both fibril ends, which has implications for fibril growth.
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