6ENV

X-ray structure of Au2phen-encapsulated horse spleen apoferritin

• PDB DOI: https://doi.org/10.2210/pdb6ENV/pdb

• Classification: PROTEIN TRANSPORT
• Organism(s): Equus caballus
• Mutation(s): No 


• Deposited: 2017-10-06 Released: 2017-12-13 
• Deposition Author(s): Ferraro, G., Merlino, A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.82 Å
• R-Value Free: 0.175 
• R-Value Work: 0.145 
• R-Value Observed: 0.147 

Starting Model: experimental

Literature

Ferritin nanocages loaded with gold ions induce oxidative stress and apoptosis in MCF-7 human breast cancer cells.

Monti, D.M., Ferraro, G., Petruk, G., Maiore, L., Pane, F., Amoresano, A., Cinellu, M.A., Merlino, A.

(2017) Dalton Trans 46: 15354-15362

• PubMed: 29072740 
• DOI: https://doi.org/10.1039/c7dt02370g
• Primary Citation of Related Structures:  
  6ENV, 6ENW


• PubMed Abstract: 
  

  Two anticancer gold(iii) compounds, Au2phen and Auoxo4, were encapsulated within a ferritin nanocage. The gold-compound loaded proteins were characterized by UV-Vis spectroscopy, inductively coupled plasma mass spectrometry and circular dichroism. X-ray crystallography shows that the compounds degrade upon encapsulation and gold(i) ions bind Ft within the cage, close to the side chains of Cys126. The gold-encapsulated nanocarriers are cytotoxic to human cancer cells. Au(i)-loaded Ft, obtained upon the encapsulation of Au2phen within the cage, induces oxidative stress activation, which finally leads to apoptosis in MCF-7 cells.

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Organizational Affiliation: 

Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario di Monte Sant'Angelo, Via Cintia, I-80126, Napoli, Italy. [e-mail].

Biological Assembly 1  

Global Symmetry: Octahedral - O  (Explore in 3D)
Global Stoichiometry: Homo 24-mer - A24 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 21.52 kDa 
• Atom Count: 1,817 
• Modelled Residue Count: 173 
• Deposited Residue Count: 174 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Ferritin light chain	A	174	Equus caballus	Mutation(s): 0
UniProt
Find proteins for P02791 (Equus caballus) Explore P02791  Go to UniProtKB:  P02791

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
AU	N [auth A], O [auth A]	GOLD ION Au ZBKIUFWVEIBQRT-UHFFFAOYSA-N
CD	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], K [auth A]	CADMIUM ION Cd WLZRMCYVCSSEQC-UHFFFAOYSA-N
SO4	M [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
CL	L [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.82 Å
• R-Value Free: 0.175 
• R-Value Work: 0.145 
• R-Value Observed: 0.147 
• Space Group: F 4 3 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 180.967	α = 90
b = 180.967	β = 90
c = 180.967	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2017-12-13 
Deposition Author(s): Ferraro, G., Merlino, A.

Revision History  

• Version 1.0: 2017-12-13
  Type: Initial release
  
• Version 1.1: 2024-01-17
  Changes: Data collection, Database references, Derived calculations, Refinement description