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- EMDB-22972: Cryo-EM structure of heavy chain mouse apoferritin -

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Basic information

Entry
Database: EMDB / ID: EMD-22972
TitleCryo-EM structure of heavy chain mouse apoferritin
Map dataraw unsharpened map
Sample
  • Complex: Heavy chain mouse apoferritin
    • Protein or peptide: Ferritin heavy chain
  • Ligand: water
Keywordsprotein / OXIDOREDUCTASE
Function / homology
Function and homology information


Iron uptake and transport / Golgi Associated Vesicle Biogenesis / iron ion sequestering activity / autolysosome / ferroxidase / intracellular sequestering of iron ion / ferroxidase activity / negative regulation of fibroblast proliferation / endocytic vesicle lumen / Neutrophil degranulation ...Iron uptake and transport / Golgi Associated Vesicle Biogenesis / iron ion sequestering activity / autolysosome / ferroxidase / intracellular sequestering of iron ion / ferroxidase activity / negative regulation of fibroblast proliferation / endocytic vesicle lumen / Neutrophil degranulation / ferric iron binding / ferrous iron binding / iron ion transport / immune response / iron ion binding / negative regulation of cell population proliferation / mitochondrion / extracellular region / identical protein binding / 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 speciesMus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 1.655 Å
AuthorsSun M / Azumaya C
Funding support United States, 6 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM118099 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01HL134183 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)P50AI150476 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)S10OD020054 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)S10OD021741 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)S10OD026881 United States
CitationJournal: J Struct Biol / Year: 2021
Title: Practical considerations for using K3 cameras in CDS mode for high-resolution and high-throughput single particle cryo-EM.
Authors: Ming Sun / Caleigh M Azumaya / Eric Tse / David P Bulkley / Matthew B Harrington / Glenn Gilbert / Adam Frost / Daniel Southworth / Kliment A Verba / Yifan Cheng / David A Agard /
Abstract: Detector technology plays a pivotal role in high-resolution and high-throughput cryo-EM structure determination. Compared with the first-generation, single-electron counting direct detection camera ...Detector technology plays a pivotal role in high-resolution and high-throughput cryo-EM structure determination. Compared with the first-generation, single-electron counting direct detection camera (Gatan K2), the latest K3 camera is faster, larger, and now offers a correlated-double sampling mode (CDS). Importantly this results in a higher DQE and improved throughput compared to its predecessor. In this study, we focused on optimizing camera data collection parameters for daily use within a cryo-EM facility and explored the balance between throughput and resolution. In total, eight data sets of murine heavy-chain apoferritin were collected at different dose rates and magnifications, using 9-hole image shift data collection strategies. The performance of the camera was characterized by the quality of the resultant 3D reconstructions. Our results demonstrated that the Gatan K3 operating in CDS mode outperformed standard (nonCDS) mode in terms of reconstruction resolution in all tested conditions with 8 electrons per pixel per second being the optimal dose rate. At low magnification (64kx) we were able to achieve reconstruction resolutions of 149% of the physical Nyquist limit (1.8 Å with a 1.346 Å physical pixel size). Low magnification allows more particles to be collected per image, aiding analysis of heterogeneous samples requiring large data sets. At moderate magnification (105kx, 0.834 Å physical pixel size) we achieved a resolution of 1.65 Å within 8-h of data collection, a condition optimal for achieving high-resolution on well behaved samples. Our results also show that for an optimal sample like apoferritin, one can achieve better than 2.5 Å resolution with 5 min of data collection. Together, our studies validate the most efficient ways of imaging protein complexes using the K3 direct detector and will greatly benefit the cryo-EM community.
History
DepositionNov 8, 2020-
Header (metadata) releaseDec 16, 2020-
Map releaseDec 16, 2020-
UpdateMar 6, 2024-
Current statusMar 6, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.007
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.007
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7kod
  • Surface level: 0.007
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-7kod
  • Imaged by Jmol
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_22972.png

Downloads & links

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Map

FileDownload / File: emd_22972.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationraw unsharpened map
Voxel sizeX=Y=Z: 0.417 Å
Density
Contour LevelBy AUTHOR: 0.007 / Movie #1: 0.007
Minimum - Maximum-0.0042242077 - 0.021097178
Average (Standard dev.)-0.000027470276 (±0.0013619398)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions512512512
Spacing512512512
CellA=B=C: 213.504 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.4170.4170.417
M x/y/z512512512
origin x/y/z0.0000.0000.000
length x/y/z213.504213.504213.504
α/β/γ90.00090.00090.000
start NX/NY/NZ192139186
NX/NY/NZ211274246
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS512512512
D min/max/mean-0.0040.021-0.000

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Supplemental data

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Additional map: filtered and sharpened map (b-factor, ~ -66)

Fileemd_22972_additional_1.map
Annotationfiltered and sharpened map (b-factor, ~ -66)
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: filtered and sharpened map (b-factor, ~ -25)

Fileemd_22972_additional_2.map
Annotationfiltered and sharpened map (b-factor, ~ -25)
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Heavy chain mouse apoferritin

EntireName: Heavy chain mouse apoferritin
Components
  • Complex: Heavy chain mouse apoferritin
    • Protein or peptide: Ferritin heavy chain
  • Ligand: water

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Supramolecule #1: Heavy chain mouse apoferritin

SupramoleculeName: Heavy chain mouse apoferritin / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Mus musculus (house mouse)

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Macromolecule #1: Ferritin heavy chain

MacromoleculeName: Ferritin heavy chain / type: protein_or_peptide / ID: 1 / Number of copies: 24 / Enantiomer: LEVO / EC number: ferroxidase
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 21.097631 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MTTASPSQVR QNYHQDAEAA INRQINLELY ASYVYLSMSC YFDRDDVALK NFAKYFLHQS HEEREHAEKL MKLQNQRGGR IFLQDIKKP DRDDWESGLN AMECALHLEK SVNQSLLELH KLATDKNDPH LCDFIETYYL SEQVKSIKEL GDHVTNLRKM G APEAGMAE YLFDKHTLGH GDES

UniProtKB: Ferritin heavy chain

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Macromolecule #2: water

MacromoleculeName: water / type: ligand / ID: 2 / Number of copies: 1727 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER / Water

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
GridModel: Quantifoil / Material: COPPER / Mesh: 300 / Pretreatment - Type: GLOW DISCHARGE
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number grids imaged: 1 / Average exposure time: 6.0 sec. / Average electron dose: 69.0 e/Å2 / Details: 9-hole image-shift data collection strategy
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: OTHER
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION
Final 3D classificationSoftware - Name: RELION
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION
Final reconstructionApplied symmetry - Point group: O (octahedral) / Resolution.type: BY AUTHOR / Resolution: 1.655 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1) / Number images used: 571000
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

5oba


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementProtocol: FLEXIBLE FIT
Output model

PDB-7kod:
Cryo-EM structure of heavy chain mouse apoferritin

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