6NB9

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


Experimental Data Snapshot

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Aggregation State: 3D ARRAY 
  • Reconstruction Method: CRYSTALLOGRAPHY 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

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: 10.1038/s41467-019-11183-z
  • Primary Citation of Related Structures:  

  • 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- ...

    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 Physiology, University of California, Los Angeles, Los Angeles, CA, 90095-1751, USA.,Howard Hughes Medical Institute, University of California, Los Angeles, Los Angeles, CA, 90095-1570, USA.,Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA.,Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA, 90095-1570, USA.,UCLA-DOE Institute, University of California, Los Angeles, Los Angeles, CA, 90095-1570, USA.,Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA. clarke@mbi.ucla.edu.,Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA, 90095-1570, USA. clarke@mbi.ucla.edu.,Department of Biological Chemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1737, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Amyloid-beta A4 protein
A
15Homo sapiensMutation(s): 1 
Gene Names: APP (A4, AD1)
Find proteins for P05067 (Homo sapiens)
Go to Gene View: APP
Go to UniProtKB:  P05067
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
IAS
Query on IAS
A
L-beta-peptide, C-gamma linkingC4 H7 N O4

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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Aggregation State: 3D ARRAY 
  • Reconstruction Method: CRYSTALLOGRAPHY 
Software Package:
Software NamePurpose
SHELXDEphasing
XSCALEdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Center for Research ResourcesUnited States5T32GM008496
National Science Foundation (United States)United StatesMCB-1714569
National Institutes of Health/National Center for Research ResourcesUnited StatesGM-007185
Howard Hughes Medical InstituteUnited States--

Revision History 

  • Version 1.0: 2019-08-07
    Type: Initial release