Biological Assembly 1  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Homo 12-mer - A12 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 54.24 kDa 
• Atom Count: 2820 
• Residue Count: 384 
• Unique protein chains: 1

2MXU

42-Residue Beta Amyloid Fibril

• DOI: 10.2210/pdb2MXU/pdb
• BMRB: 25429

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


• Deposited: 2015-01-14 Released: 2015-05-06 
• Deposition Author(s): Xiao, Y., Ma, B., McElheny, D., Parthasarathy, S., Long, F., Hoshi, M., Nussinov, R., Ishii, Y.

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Experimental Data Snapshot

• Method: SOLID-STATE NMR
• Conformers Calculated: 1000 
• Conformers Submitted: 10 
• Selection Criteria: structures with the least restraint violations 

Literature

A beta (1-42) fibril structure illuminates self-recognition and replication of amyloid in Alzheimer's disease.

Xiao, Y., Ma, B., McElheny, D., Parthasarathy, S., Long, F., Hoshi, M., Nussinov, R., Ishii, Y.

(2015) Nat Struct Mol Biol 22: 499-505

• PubMed: 25938662 
• DOI: 10.1038/nsmb.2991
• Primary Citation of Related Structures:  
  2MXU


• PubMed Abstract: 
  

Increasing evidence has suggested that formation and propagation of misfolded aggregates of 42-residue human amyloid β (Aβ(1-42)), rather than of the more abundant Aβ(1-40), provokes the Alzheimer's disease cascade. However, structural details of misfolded Aβ(1-42) have remained elusive. Here we present the atomic model of an Aβ(1-42) amyloid fibril, from solid-state NMR (ssNMR) data. It displays triple parallel-β-sheet segments that differ from reported structures of Aβ(1-40) fibrils. Remarkably, Aβ(1-40) is incompatible with the triple-β-motif, because seeding with Aβ(1-42) fibrils does not promote conversion of monomeric Aβ(1-40) into fibrils via cross-replication. ssNMR experiments suggest that C-terminal Ala42, absent in Aβ(1-40), forms a salt bridge with Lys28 to create a self-recognition molecular switch that excludes Aβ(1-40). The results provide insight into the Aβ(1-42)-selective self-replicating amyloid-propagation machinery in early-stage Alzheimer's disease.

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Organizational Affiliation: 

1] Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois, USA. [2] Center for Structural Biology, University of Illinois at Chicago, Chicago, Illinois, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Amyloid beta A4 protein	A, B, C, D, E, F, G, H, I, J, K, L	42	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: 1000 
• Conformers Submitted: 10 
• Selection Criteria: structures with the least restraint violations 
• OLDERADO: 2MXU Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2015-01-14 
• Released Date: 2015-05-06 
Deposition Author(s): Xiao, Y., Ma, B., McElheny, D., Parthasarathy, S., Long, F., Hoshi, M., Nussinov, R., Ishii, Y.

Revision History 

• Version 1.0: 2015-05-06
  Type: Initial release
  
• Version 1.1: 2015-05-20
  Changes: Database references
• Version 1.2: 2015-06-17
  Changes: Database references