22FX | pdb_000022fx

Cryo-EM structure of mouse heavy-chain apoferritin at 1.24 A on CRYO ARM 200 II

• PDB DOI: https://doi.org/10.2210/pdb22FX/pdb
• EM Map EMD-68251: EMDB EMDataResource

• Classification: METAL BINDING PROTEIN
• Organism(s): Mus musculus
• Expression System: Escherichia coli 'BL21-Gold(DE3)pLysS AG
• Mutation(s): No 


• Deposited: 2026-01-09 Released: 2026-03-04 
• Deposition Author(s): Danev, R., Yanagisawa, H., Yamashita, K., Eisenstein, F., Kikkawa, M.
• Funding Organization(s): Japan Society for the Promotion of Science (JSPS), Japan Agency for Medical Research and Development (AMED)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 1.24 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental

Literature

Atomic resolution cryo-EM at 200 keV

Danev, R., Yanagisawa, H., Yamashita, K., Eisenstein, F., Kikkawa, M.

To be published.

Biological Assembly 1  

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

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

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 21.22 kDa 
• Atom Count: 1,814 
• Modeled Residue Count: 173 
• Deposited Residue Count: 182 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Ferritin heavy chain	A	182	Mus musculus	Mutation(s): 0  Gene Names: Fth1, Fth EC: 1.16.3.1
UniProt & NIH Common Fund Data Resources
Find proteins for P09528 (Mus musculus) Explore P09528  Go to UniProtKB:  P09528
IMPC:  MGI:95588

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	C [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
FE	B [auth A]	FE (III) ION Fe VTLYFUHAOXGGBS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 1.24 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	Servalcat
MODEL REFINEMENT	Coot
RECONSTRUCTION	cryoSPARC	4.5

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2026-03-04 
Deposition Author(s): Danev, R., Yanagisawa, H., Yamashita, K., Eisenstein, F., Kikkawa, M.

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Funding Organization	Location	Grant Number
Japan Society for the Promotion of Science (JSPS)	Japan	22H02554
Japan Agency for Medical Research and Development (AMED)	Japan	JP25ama121002j0004

Revision History  

• Version 1.0: 2026-03-04
  Type: Initial release