Structural Model for a 40-residue Beta-Amyloid Fibril with Three-Fold Symmetry, Positive Stagger

Experimental Data Snapshot

  • Conformers Calculated: 40 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

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Molecular structural basis for polymorphism in Alzheimer's beta-amyloid fibrils

Paravastu, A.Leapman, R.Yau, W.Tycko, R.

(2008) Proc Natl Acad Sci U S A 105: 18349-18354

  • DOI: https://doi.org/10.1073/pnas.0806270105
  • Primary Citation of Related Structures:  
    2LMN, 2LMO, 2LMP, 2LMQ

  • PubMed Abstract: 

    We describe a full structural model for amyloid fibrils formed by the 40-residue beta-amyloid peptide associated with Alzheimer's disease (Abeta(1-40)), based on numerous constraints from solid state NMR and electron microscopy. This model applies specifically to fibrils with a periodically twisted morphology, with twist period equal to 120 +/- 20 nm (defined as the distance between apparent minima in fibril width in negatively stained transmission electron microscope images). The structure has threefold symmetry about the fibril growth axis, implied by mass-per-length data and the observation of a single set of (13)C NMR signals. Comparison with a previously reported model for Abeta(1-40) fibrils with a qualitatively different, striated ribbon morphology reveals the molecular basis for polymorphism. At the molecular level, the 2 Abeta(1-40) fibril morphologies differ in overall symmetry (twofold vs. threefold), the conformation of non-beta-strand segments, and certain quaternary contacts. Both morphologies contain in-register parallel beta-sheets, constructed from nearly the same beta-strand segments. Because twisted and striated ribbon morphologies are also observed for amyloid fibrils formed by other polypeptides, such as the amylin peptide associated with type 2 diabetes, these structural variations may have general implications.

  • Organizational Affiliation

    Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-0520, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-amyloid protein 40
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R
40Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P05067 (Homo sapiens)
Explore P05067 
Go to UniProtKB:  P05067
PHAROS:  P05067
GTEx:  ENSG00000142192 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05067
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Conformers Calculated: 40 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-12-28
    Type: Initial release