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- EMDB-16786: Human apoferritin after 561 nm laser exposure -

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Basic information

Entry
Database: EMDB / ID: EMD-16786
TitleHuman apoferritin after 561 nm laser exposure
Map dataMap of human apoferritin acquired after illumination with 561 nm laser light (3.9e6 photons per sq. A).
Sample
  • Organelle or cellular component: Apoferritin
    • Protein or peptide: Ferritin heavy chain, N-terminally processed
  • Ligand: SODIUM ION
  • Ligand: MAGNESIUM ION
  • Ligand: water
KeywordsIron binding protein / METAL BINDING PROTEIN
Function / homology
Function and homology information


iron ion sequestering activity / ferritin complex / Scavenging by Class A Receptors / negative regulation of ferroptosis / Golgi Associated Vesicle Biogenesis / ferroxidase / autolysosome / ferroxidase activity / negative regulation of fibroblast proliferation / ferric iron binding ...iron ion sequestering activity / ferritin complex / Scavenging by Class A Receptors / negative regulation of ferroptosis / Golgi Associated Vesicle Biogenesis / ferroxidase / autolysosome / ferroxidase activity / negative regulation of fibroblast proliferation / ferric iron binding / autophagosome / iron ion transport / Iron uptake and transport / ferrous iron binding / tertiary granule lumen / ficolin-1-rich granule lumen / intracellular iron ion homeostasis / immune response / iron ion binding / negative regulation of cell population proliferation / Neutrophil degranulation / extracellular exosome / extracellular region / identical protein binding / nucleus / 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 speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 1.76 Å
AuthorsLast MGF / Noteborn WEM / Sharp TH
Funding support Netherlands, 1 items
OrganizationGrant numberCountry
Netherlands Organisation for Scientific Research (NWO)VI.Vidi.193.014 Netherlands
CitationJournal: J Struct Biol / Year: 2023
Title: Super-resolution fluorescence imaging of cryosamples does not limit achievable resolution in cryoEM.
Authors: Mart G F Last / Willem E M Noteborn / Lenard M Voortman / Thomas H Sharp /
Abstract: Correlated super-resolution cryo-fluorescence and cryo-electron microscopy (cryoEM) has been gaining popularity as a method to investigate biological samples with high resolution and specificity. A ...Correlated super-resolution cryo-fluorescence and cryo-electron microscopy (cryoEM) has been gaining popularity as a method to investigate biological samples with high resolution and specificity. A concern in this combined method (called SR-cryoCLEM), however, is whether and how fluorescence imaging prior to cryoEM acquisition is detrimental to sample integrity. In this report, we investigated the effect of high-dose laser light (405, 488, and 561 nm) irradiation on apoferritin samples prepared for cryoEM with excitation wavelengths commonly used in fluorescence microscopy, and compared these samples to controls that were kept in the dark. We found that laser illumination, of equal duration and intensity as used in cryo-single molecule localization microscopy (cryoSMLM) and in the presence of high concentrations of fluorescent protein, did not affect the achievable resolution in cryoEM, with final reconstructions reaching resolutions of ∼ 1.8 Å regardless of the laser illumination. The finding that super-resolution fluorescence imaging of cryosamples prior to cryoEM data acquisition does not limit the achievable resolution suggests that super-resolution cryo-fluorescence microscopy and in situ structural biology using cryoEM are entirely compatible.
History
DepositionMar 3, 2023-
Header (metadata) releaseMar 15, 2023-
Map releaseMar 15, 2023-
UpdateNov 22, 2023-
Current statusNov 22, 2023Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_16786.png

Downloads & links

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Map

FileDownload / File: emd_16786.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationMap of human apoferritin acquired after illumination with 561 nm laser light (3.9e6 photons per sq. A).
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.66 Å/pix.
x 300 pix.
= 196.8 Å		0.66 Å/pix.
x 300 pix.
= 196.8 Å		0.66 Å/pix.
x 300 pix.
= 196.8 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.656 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.025
Minimum - Maximum-0.049557958 - 0.100600384
Average (Standard dev.)0.00017561123 (±0.0049468684)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 196.8 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half map 1

Fileemd_16786_half_map_1.map
AnnotationHalf map 1
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map 2

Fileemd_16786_half_map_2.map
AnnotationHalf map 2
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

EntireName: Apoferritin
Components
  • Organelle or cellular component: Apoferritin
    • Protein or peptide: Ferritin heavy chain, N-terminally processed
  • Ligand: SODIUM ION
  • Ligand: MAGNESIUM ION
  • Ligand: water

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Supramolecule #1: Apoferritin

SupramoleculeName: Apoferritin / type: organelle_or_cellular_component / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 484 KDa

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Macromolecule #1: Ferritin heavy chain, N-terminally processed

MacromoleculeName: Ferritin heavy chain, N-terminally processed / type: protein_or_peptide / ID: 1 / Number of copies: 24 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 20.21857 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
STSQVRQNYH QDSEAAINRQ INLELYASYV YLSMSYYFDR DDVALKNFAK YFLHQSHEER EHAEKLMKLQ NQRGGRIFLQ DIQKPD(CSX)DD WESGLNAMEC ALHLEKNVNQ SLLELHKLAT DKNDPHLCDF IETHYLNEQV KAIKELGDHV TNLRKMG AP ESGLAEYLFD KHTLG

UniProtKB: Ferritin heavy chain

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Macromolecule #2: SODIUM ION

MacromoleculeName: SODIUM ION / type: ligand / ID: 2 / Number of copies: 24
Molecular weightTheoretical: 22.99 Da

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Macromolecule #3: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 3 / Number of copies: 14 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #4: water

MacromoleculeName: water / type: ligand / ID: 4 / Number of copies: 1705 / 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

Concentration4 mg/mL
BufferpH: 8
Component:
ConcentrationFormulaName
20.0 mMTrisTris
150.0 mMNaClsodium chloride
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: GOLD / Support film - topology: HOLEY / Support film - Film thickness: 50
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 295 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Specialist opticsEnergy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 130000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 1.76 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 9700
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

6z6u


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

PDB-8cpu:
Human apoferritin after 561 nm laser exposure

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