Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 487.32 kDa 
• Atom Count: 35,823 
• Modelled Residue Count: 4,160 
• Deposited Residue Count: 4,176 
• Unique protein chains: 1

 6V21

Mouse heavy chain apoferritin determined using single-particle cryo-EM at 200 keV

• PDB DOI:  https://doi.org/10.2210/pdb6V21/pdb
• EM Map EMD-21024: EMDB EMDataResource

• Classification: METAL BINDING PROTEIN, OXIDOREDUCTASE
• Organism(s): Mus musculus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2019-11-21 Released: 2020-02-12 
• Deposition Author(s): Wu, M., Lander, G.C., Herzik, M.A.
• Funding Organization(s): National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 1.75 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Sub-2 Angstrom resolution structure determination using single-particle cryo-EM at 200 keV.

Wu, M., Lander, G.C., Herzik Jr., M.A.

(2020) J Struct Biol X 4: 100020-100020

• PubMed: 32647824 
• DOI: https://doi.org/10.1016/j.yjsbx.2020.100020
• Primary Citation of Related Structures:  
  6V20, 6V21


• PubMed Abstract: 
  

Although the advent of direct electron detectors (DEDs) and software developments have enabled the routine use of single-particle cryogenic electron microscopy (cryo-EM) for structure determination of well-behaved specimens to high-resolution, there nonetheless remains a discrepancy between the resolutions attained for biological specimens and the information limits of modern transmission electron microscopes (TEMs). Instruments operating at 300 kV equipped with DEDs are the current paradigm for high-resolution single-particle cryo-EM, while 200 kV TEMs remain comparatively underutilized for purposes beyond sample screening. Here, we expand upon our prior work and demonstrate that one such 200 kV microscope, the Talos Arctica, equipped with a K2 DED is capable of determining structures of macromolecules to as high as ∼1.7 Å resolution. At this resolution, ordered water molecules are readily assigned and holes in aromatic residues can be clearly distinguished in the reconstructions. This work emphasizes the utility of 200 kV electrons for high-resolution single-particle cryo-EM and applications such as structure-based drug design.

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Organizational Affiliation: 

Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, United States.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Ferritin heavy chain	A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X	174	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

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 1.75 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
RECONSTRUCTION	RELION	3.1
MODEL REFINEMENT	PHENIX	1.14_3260

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2020-02-12 
Deposition Author(s): Wu, M., Lander, G.C., Herzik, M.A.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)	United States	DP2EB020402

Revision History  

• Version 1.0: 2020-02-12
  Type: Initial release
  
• Version 1.1: 2020-08-26
  Changes: Database references