Amyloid-Beta (20-34) with L-isoaspartate 23

Experimental Data Snapshot

  • Resolution: 1.05 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.202 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Structure of amyloid-beta (20-34) with Alzheimer's-associated isomerization at Asp23 reveals a distinct protofilament interface.

Warmack, R.A.Boyer, D.R.Zee, C.T.Richards, L.S.Sawaya, M.R.Cascio, D.Gonen, T.Eisenberg, D.S.Clarke, S.G.

(2019) Nat Commun 10: 3357-3357

  • DOI: https://doi.org/10.1038/s41467-019-11183-z
  • Primary Citation of Related Structures:  
    6NB9, 6OIZ

  • PubMed Abstract: 

    Amyloid-β (Aβ) harbors numerous posttranslational modifications (PTMs) that may affect Alzheimer's disease (AD) pathogenesis. Here we present the 1.1 Å resolution MicroED structure of an Aβ 20-34 fibril with and without the disease-associated PTM, L-isoaspartate, at position 23 (L-isoAsp23). Both wild-type and L-isoAsp23 protofilaments adopt β-helix-like folds with tightly packed cores, resembling the cores of full-length fibrillar Aβ structures, and both self-associate through two distinct interfaces. One of these is a unique Aβ interface strengthened by the isoaspartyl modification. Powder diffraction patterns suggest a similar structure may be adopted by protofilaments of an analogous segment containing the heritable Iowa mutation, Asp23Asn. Consistent with its early onset phenotype in patients, Asp23Asn accelerates aggregation of Aβ 20-34, as does the L-isoAsp23 modification. These structures suggest that the enhanced amyloidogenicity of the modified Aβ segments may also reduce the concentration required to achieve nucleation and therefore help spur the pathogenesis of AD.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Amyloid-beta A4 protein15Homo sapiensMutation(s): 1 
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

  • Resolution: 1.05 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.202 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 29.2α = 90
b = 4.87β = 101.9
c = 32.44γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
PDB_EXTRACTdata extraction
EM Software:
TaskSoftware PackageVersion

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Center for Research Resources (NIH/NCRR)United States5T32GM008496
National Science Foundation (NSF, United States)United StatesMCB-1714569
National Institutes of Health/National Center for Research Resources (NIH/NCRR)United StatesGM-007185
Howard Hughes Medical Institute (HHMI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2019-08-07
    Type: Initial release
  • Version 1.1: 2019-11-20
    Changes: Author supporting evidence
  • Version 1.2: 2022-09-07
    Changes: Data collection, Database references, Refinement description