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- EMDB-35984: Single-particle cryo-EM structure of mouse apoferritin at 1.19 An... -

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Basic information

Entry
Database: EMDB / ID: EMD-35984
TitleSingle-particle cryo-EM structure of mouse apoferritin at 1.19 Angstrom resolution (Dataset A)
Map data
Sample
  • Complex: Apoferritin from Mus musculus
    • Protein or peptide: Ferritin heavy chain
  • Ligand: SODIUM ION
  • Ligand: water
Keywordssingle-particle cryo-EM / Cold field emission / CFEG / Apoferritin / CRYO ARM / STRUCTURAL PROTEIN
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 / iron ion binding / immune response / negative regulation of cell population proliferation / mitochondrion / extracellular region / identical protein binding / membrane / cytoplasm / cytosol
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: 1.19 Å
AuthorsKawakami K / Maki-Yonekura S / Hamaguchi T / Takaba K / Yonekura K
Funding support Japan, 2 items
OrganizationGrant numberCountry
Japan Society for the Promotion of Science (JSPS)JPMJMI20G5 Japan
Japan Society for the Promotion of Science (JSPS)JPMJCR18J2 Japan
CitationJournal: Commun Chem / Year: 2023
Title: Measurement of charges and chemical bonding in a cryo-EM structure.
Authors: Saori Maki-Yonekura / Keisuke Kawakami / Kiyofumi Takaba / Tasuku Hamaguchi / Koji Yonekura /
Abstract: Hydrogen bonding, bond polarity, and charges in protein molecules play critical roles in the stabilization of protein structures, as well as affecting their functions such as enzymatic catalysis, ...Hydrogen bonding, bond polarity, and charges in protein molecules play critical roles in the stabilization of protein structures, as well as affecting their functions such as enzymatic catalysis, electron transfer, and ligand binding. These effects can potentially be measured in Coulomb potentials using cryogenic electron microscopy (cryo-EM). We here present charges and bond properties of hydrogen in a sub-1.2 Å resolution structure of a protein complex, apoferritin, by single-particle cryo-EM. A weighted difference map reveals positive densities for most hydrogen atoms in the core region of the complex, while negative densities around acidic amino-acid side chains are likely related to negative charges. The former positive densities identify the amino- and oxo-termini of asparagine and glutamine side chains. The latter observations were verified by spatial-resolution selection and a dose-dependent frame series. The average position of the hydrogen densities depends on the parent bonded-atom type, and this is validated by the estimated level of the standard uncertainties in the bond lengths.
History
DepositionApr 21, 2023-
Header (metadata) releaseJul 12, 2023-
Map releaseJul 12, 2023-
UpdateJul 3, 2024-
Current statusJul 3, 2024Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_35984.png

Downloads & links

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Map

FileDownload / File: emd_35984.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 0.396 Å
Density
Contour LevelBy AUTHOR: 0.0253
Minimum - Maximum-0.07354688 - 0.27169043
Average (Standard dev.)0.000022167786 (±0.011480715)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 126.72 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_35984_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: weighted difference map calculated by servalcat

Fileemd_35984_additional_1.map
Annotationweighted difference map calculated by servalcat
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Dataset A Half1 map

Fileemd_35984_half_map_1.map
AnnotationDataset_A Half1_map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Dataset A Half2 map

Fileemd_35984_half_map_2.map
AnnotationDataset_A Half2_map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Apoferritin from Mus musculus

EntireName: Apoferritin from Mus musculus
Components
  • Complex: Apoferritin from Mus musculus
    • Protein or peptide: Ferritin heavy chain
  • Ligand: SODIUM ION
  • Ligand: water

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Supramolecule #1: Apoferritin from Mus musculus

SupramoleculeName: Apoferritin from Mus musculus / 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: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 20.079594 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
PSQVRQNYHQ DAEAAINRQI NLELYASYVY LSMSCYFDRD DVALKNFAKY FLHQSHEERE HAEKLMKLQN QRGGRIFLQD IKKPDRDDW ESGLNAMECA LHLEKSVNQS LLELHKLATD KNDPHLCDFI ETYYLSEQVK SIKELGDHVT NLRKMGAPEA G MAEYLFDK HTLG

UniProtKB: Ferritin heavy chain

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Macromolecule #2: SODIUM ION

MacromoleculeName: SODIUM ION / type: ligand / ID: 2 / Number of copies: 1
Molecular weightTheoretical: 22.99 Da

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Macromolecule #3: water

MacromoleculeName: water / type: ligand / ID: 3 / Number of copies: 141 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
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
VitrificationCryogen name: NITROGEN

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Electron microscopy

MicroscopeJEOL CRYO ARM 300
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 36.47 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 150.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.0 µm / Nominal defocus min: 0.5 µm

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Image processing

Startup modelType of model: OTHER / Details: ab initio
Final reconstructionResolution.type: BY AUTHOR / Resolution: 1.19 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1) / Number images used: 2235864
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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