Structural Insight into an Alzheimer's Brain-Derived Spherical Assembly of Amyloid ß by Solid-State NMR.
J Am Chem Soc
; 137(20): 6480-3, 2015 May 27.
Article
em En
| MEDLINE
| ID: mdl-25938164
ABSTRACT
Accumulating evidence suggests that various neurodegenerative diseases, including Alzheimer's disease (AD), are linked to cytotoxic diffusible aggregates of amyloid proteins, which are metastable intermediate species in protein misfolding. This study presents the first site-specific structural study on an intermediate called amylospheroid (ASPD), an AD-derived neurotoxin composed of oligomeric amyloid-ß (Aß). Electron microscopy and immunological analyses using ASPD-specific "conformational" antibodies established synthetic ASPD for the 42-residue Aß(1-42) as an excellent structural/morphological analogue of native ASPD extracted from AD patients, the level of which correlates with the severity of AD. (13)C solid-state NMR analyses of approximately 20 residues and interstrand distances demonstrated that the synthetic ASPD is made of a homogeneous single conformer containing parallel ß-sheets. These results provide profound insight into the native ASPD, indicating that Aß is likely to self-assemble into the toxic intermediate with ß-sheet structures in AD brains. This approach can be applied to various intermediates relevant to amyloid diseases.
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Base de dados:
MEDLINE
Assunto principal:
Encéfalo
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Ressonância Magnética Nuclear Biomolecular
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Doença de Alzheimer
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Amiloide
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article