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- PDB-7v66: Structure of Apoferritin -

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Basic information

Entry
Database: PDB / ID: 7v66
TitleStructure of Apoferritin
ComponentsFerritin heavy chain
KeywordsOXIDOREDUCTASE / complex / TRANSPORT PROTEIN
Function / homology
Function and homology information


iron ion sequestering activity / : / autolysosome / Scavenging by Class A Receptors / Golgi Associated Vesicle Biogenesis / ferroxidase / intracellular sequestering of iron ion / ferroxidase activity / negative regulation of fibroblast proliferation / ferric iron binding ...iron ion sequestering activity / : / autolysosome / Scavenging by Class A Receptors / Golgi Associated Vesicle Biogenesis / ferroxidase / intracellular sequestering of iron ion / ferroxidase activity / negative regulation of fibroblast proliferation / ferric iron binding / ferrous iron binding / Iron uptake and transport / tertiary granule lumen / iron ion transport / intracellular iron ion homeostasis / ficolin-1-rich granule lumen / immune response / iron ion binding / negative regulation of cell population proliferation / Neutrophil degranulation / extracellular exosome / extracellular region / identical protein binding / nucleus / cytosol / cytoplasm
Similarity search - Function
Ferritin iron-binding regions signature 1. / Ferritin iron-binding regions signature 2. / Ferritin, conserved site / Ferritin / Ferritin-like diiron domain / Ferritin-like diiron domain profile. / Ferritin/DPS protein domain / Ferritin-like domain / Ferritin-like / Ferritin-like superfamily
Similarity search - Domain/homology
Ferritin heavy chain
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 1.89 Å
AuthorsZhang, X. / Wu, C. / Shi, H.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: QRB Discov / Year: 2021
Title: Low-cooling-rate freezing in biomolecular cryo-electron microscopy for recovery of initial frames.
Authors: Chunling Wu / Huigang Shi / Dongjie Zhu / Kelong Fan / Xinzheng Zhang /
Abstract: When biological samples are first exposed to electrons in cryo-electron microcopy (cryo-EM), proteins exhibit a rapid 'burst' phase of beam-induced motion that cannot be corrected with software. This ...When biological samples are first exposed to electrons in cryo-electron microcopy (cryo-EM), proteins exhibit a rapid 'burst' phase of beam-induced motion that cannot be corrected with software. This lowers the quality of the initial frames, which are the least damaged by the electrons. Hence, they are commonly excluded or down-weighted during data processing, reducing the undamaged signal and the resolution in the reconstruction. By decreasing the cooling rate during sample preparation, either with a cooling-rate gradient or by increasing the freezing temperature, we show that the quality of the initial frames for various protein and virus samples can be recovered. Incorporation of the initial frames in the reconstruction increases the resolution by an amount equivalent to using ~60% more data. Moreover, these frames preserve the high-quality cryo-EM densities of radiation-sensitive residues, which is often damaged or very weak in canonical three-dimensional reconstruction. The improved freezing conditions can be easily achieved using existing devices and enhance the overall quality of cryo-EM structures.
History
DepositionAug 19, 2021Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Oct 5, 2022Provider: repository / Type: Initial release
Revision 1.1Feb 15, 2023Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.year
Revision 1.2Aug 16, 2023Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / citation
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ISSN / _citation.journal_volume / _citation.pdbx_database_id_PubMed / _citation.title

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
U: Ferritin heavy chain
A: Ferritin heavy chain
B: Ferritin heavy chain
C: Ferritin heavy chain
D: Ferritin heavy chain
E: Ferritin heavy chain
F: Ferritin heavy chain
G: Ferritin heavy chain
H: Ferritin heavy chain
I: Ferritin heavy chain
J: Ferritin heavy chain
K: Ferritin heavy chain
L: Ferritin heavy chain
M: Ferritin heavy chain
N: Ferritin heavy chain
O: Ferritin heavy chain
P: Ferritin heavy chain
Q: Ferritin heavy chain
R: Ferritin heavy chain
S: Ferritin heavy chain
T: Ferritin heavy chain
V: Ferritin heavy chain
W: Ferritin heavy chain
X: Ferritin heavy chain


Theoretical massNumber of molelcules
Total (without water)482,79724
Polymers482,79724
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein ...
Ferritin heavy chain / / Ferritin H subunit / Cell proliferation-inducing gene 15 protein


Mass: 20116.547 Da / Num. of mol.: 24
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: FTH1, FTH, FTHL6, OK/SW-cl.84, PIG15 / Production host: Escherichia coli (E. coli) / References: UniProt: P02794, ferroxidase

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Human apoferritinFerritin / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.44 MDa / Experimental value: YES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 1.89 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 296695 / Symmetry type: POINT

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