Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C3  (3D View)
Global Stoichiometry: Homo 18-mer - A18 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 78.05 kDa 
• Atom Count: 4284 
• Residue Count: 576 
• Unique protein chains: 1

2LMQ

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

• DOI: 10.2210/pdb2LMQ/pdb
• BMRB: 18131

• Classification: PROTEIN FIBRIL
• Organism(s): Homo sapiens
• Mutation(s): No 


• Deposited: 2011-12-09 Released: 2011-12-28 
• Deposition Author(s): Tycko, R., Paravastu, A.

---

Experimental Data Snapshot

• Method: SOLID-STATE NMR
• Conformers Calculated: 40 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 

Literature

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

Paravastu, A.K., Leapman, R.D., Yau, W.M., Tycko, R.

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

• PubMed: 19015532 
• DOI: 10.1073/pnas.0806270105
• Structures With Same Primary Citation


• 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.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Beta-amyloid protein 40	A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R	40	Homo sapiens	Mutation(s): 0  Gene Names: APP, A4, AD1
Find proteins for P05067 (Homo sapiens) Explore P05067  Go to UniProtKB:  P05067
NIH Common Fund Data Resources
PHAROS  P05067

Experimental Data & Validation

Experimental Data

• Method: SOLID-STATE NMR
• Conformers Calculated: 40 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2LMQ Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-12-09 
• Released Date: 2011-12-28 
Deposition Author(s): Tycko, R., Paravastu, A.

Revision History 

• Version 1.0: 2011-12-28
  Type: Initial release
  
• Version 1.1: 2017-05-03
  Changes: Database references