8KH2

Crystal structure of horse-spleen L-ferritin fused with amyloid beta peptide (1-42).


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.215 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Fusion of amyloid beta with ferritin yields an isolated oligomeric beta-sheet-rich aggregate inside the ferritin cage.

Maity, B.Kameyama, S.Tian, J.Pham, T.T.Abe, S.Chatani, E.Murata, K.Ueno, T.

(2024) Biomater Sci 

  • DOI: https://doi.org/10.1039/d4bm00173g
  • Primary Citation of Related Structures:  
    8KH2

  • PubMed Abstract: 

    Alzheimer's disease is a severe brain condition caused by the formation of amyloid plaques composed of amyloid beta (Aβ) peptides. These peptides form oligomers, protofibrils, and fibrils before deposition into amyloid plaques. Among these intermediates, Aβ oligomers (AβOs) were found to be the most toxic and therefore an appealing target for drug development and understanding their role in the disease. However, precise isolation and characterization of AβOs have proven challenging because AβOs tend to aggregate and form heterogeneous mixtures in solution. As a solution, we genetically fused the Aβ peptide with a ferritin monomer. Such fusion allowed the encapsulation of precisely 24 Aβ peptides inside the 24-mer ferritin cage. Using high-speed atomic force microscopy (HS-AFM), we disassembled ferritin and directly visualized the Aβ core enclosed within the cage. The thioflavin-T assay (ThT) and attenuated total reflection infrared spectroscopy (ATR-IR) revealed the presence of a β-sheet structure in the encapsulated oligomeric aggregate. Gallic acid, an amyloid inhibitor, can inhibit the fluorescence of ThT bound AβOs. Our approach represents a significant advancement in the isolation and characterization of β-sheet rich AβOs and is expected to be useful for future studies of other disordered peptides such as α-synuclein and tau.


  • Organizational Affiliation

    School of Life Science and Technology, Tokyo Institute of Technology, Nagatsuta-cho, 4259, Midori-ku, Yokohama 226 8501, Japan. tueno@bio.titech.ac.jp.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ferritin light chain,Amyloid-beta precursor protein (Fragment)219Equus caballusMutation(s): 0 
Gene Names: FTLAPP
UniProt
Find proteins for Q28280 (Canis lupus familiaris)
Explore Q28280 
Go to UniProtKB:  Q28280
Find proteins for P02791 (Equus caballus)
Explore P02791 
Go to UniProtKB:  P02791
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsQ28280P02791
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CD
Query on CD

Download Ideal Coordinates CCD File 
B [auth A]
C [auth A]
D [auth A]
E [auth A]
F [auth A]
B [auth A],
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A]
CADMIUM ION
Cd
WLZRMCYVCSSEQC-UHFFFAOYSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
K [auth A],
L [auth A],
M [auth A]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
CL
Query on CL

Download Ideal Coordinates CCD File 
N [auth A]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.215 
  • Space Group: F 4 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 181.935α = 90
b = 181.935β = 90
c = 181.935γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
CrysalisProdata collection
CrysalisProdata reduction
Aimlessdata scaling
MOLREPphasing
Cootmodel building

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Japan Society for the Promotion of Science (JSPS)Japan--

Revision History  (Full details and data files)

  • Version 1.0: 2024-04-03
    Type: Initial release