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- PDB-8bka: Cryo-EM structure of mouse heavy-chain apoferritin at 2.7 A plung... -

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Basic information

Entry
Database: PDB / ID: 8bka
TitleCryo-EM structure of mouse heavy-chain apoferritin at 2.7 A plunged 35ms after mixing with b-galactosidase
ComponentsFerritin heavy chain
KeywordsMETAL BINDING PROTEIN / iron storage / ferritin / octahedral
Function / homology
Function and homology information


Iron uptake and transport / Golgi Associated Vesicle Biogenesis / negative regulation of ferroptosis / ferroxidase / autolysosome / ferroxidase activity / Neutrophil degranulation / endocytic vesicle lumen / ferric iron binding / autophagosome ...Iron uptake and transport / Golgi Associated Vesicle Biogenesis / negative regulation of ferroptosis / ferroxidase / autolysosome / ferroxidase activity / Neutrophil degranulation / endocytic vesicle lumen / ferric iron binding / autophagosome / iron ion transport / intracellular iron ion homeostasis / immune response / iron ion binding / negative regulation of cell population proliferation / mitochondrion / extracellular region / identical protein binding / membrane / cytosol
Similarity search - Function
Ferritin iron-binding regions signature 1. / Ferritin iron-binding regions signature 2. / Ferritin, conserved site / Ferritin, core subunit, four-helix bundle / Ferritin / Ferritin / Ferritin-like diiron domain / Ferritin-like diiron domain profile. / Ferritin/DPS protein domain / Ferritin-like domain ...Ferritin iron-binding regions signature 1. / Ferritin iron-binding regions signature 2. / Ferritin, conserved site / Ferritin, core subunit, four-helix bundle / Ferritin / Ferritin / Ferritin-like diiron domain / Ferritin-like diiron domain profile. / Ferritin/DPS protein domain / Ferritin-like domain / Ferritin-like / Ferritin-like superfamily / Up-down Bundle / Mainly Alpha
Similarity search - Domain/homology
: / Ferritin heavy chain
Similarity search - Component
Biological speciesMus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.7 Å
AuthorsTorino, S. / Dhurandhar, M. / Efremov, R.
Funding supportEuropean Union, Belgium, 3items
OrganizationGrant numberCountry
European Research Council (ERC)726436European Union
Research Foundation - Flanders (FWO)G0H5916N Belgium
Research Foundation - Flanders (FWO)G054617N Belgium
CitationJournal: Nat Methods / Year: 2023
Title: Time-resolved cryo-EM using a combination of droplet microfluidics with on-demand jetting.
Authors: Stefania Torino / Mugdha Dhurandhar / Annelore Stroobants / Raf Claessens / Rouslan G Efremov /
Abstract: Single-particle cryogenic electron microscopy (cryo-EM) allows reconstruction of high-resolution structures of proteins in different conformations. Protein function often involves transient ...Single-particle cryogenic electron microscopy (cryo-EM) allows reconstruction of high-resolution structures of proteins in different conformations. Protein function often involves transient functional conformations, which can be resolved using time-resolved cryo-EM (trEM). In trEM, reactions are arrested after a defined delay time by rapid vitrification of protein solution on the EM grid. Despite the increasing interest in trEM among the cryo-EM community, making trEM samples with a time resolution below 100 ms remains challenging. Here we report the design and the realization of a time-resolved cryo-plunger that combines a droplet-based microfluidic mixer with a laser-induced generator of microjets that allows rapid reaction initiation and plunge-freezing of cryo-EM grids. Using this approach, a time resolution of 5 ms was achieved and the protein density map was reconstructed to a resolution of 2.1 Å. trEM experiments on GroEL:GroES chaperonin complex resolved the kinetics of the complex formation and visualized putative short-lived conformations of GroEL-ATP complex.
History
DepositionNov 8, 2022Deposition site: PDBE / Processing site: PDBE
Revision 1.0Aug 9, 2023Provider: repository / Type: Initial release
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Revision 1.1Aug 30, 2023Group: Data collection / Database references
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Revision 1.3Jul 9, 2025Group: Data collection / Structure summary / Category: em_admin / em_software / pdbx_entry_details
Item: _em_admin.last_update / _em_software.name / _pdbx_entry_details.has_protein_modification
Revision 1.1Jul 9, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
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
Y: Ferritin heavy chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)506,67830
Polymers506,34324
Non-polymers3356
Water40,9122271
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area91100 Å2
ΔGint-398 kcal/mol
Surface area140850 Å2
MethodPISA

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Components

#1: Protein ...
Ferritin heavy chain / Ferritin H subunit


Mass: 21097.631 Da / Num. of mol.: 24
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Gene: Fth1, Fth / Production host: Escherichia coli (E. coli) / References: UniProt: P09528, ferroxidase
#2: Chemical
ChemComp-FE / FE (III) ION


Mass: 55.845 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: Fe
#3: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 2271 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestN
Has protein modificationN

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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: Mouse heavy chain apoferritin from E.coli / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Mus musculus (house mouse)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5 / Details: contains Amaranth dye (acid red 27) 32 mM
Buffer component
IDConc.NameFormulaBuffer-ID
120 mM4-(2-hydroxyethyl)-1-piperazineethanesulfonic acidHEPES1
2100 mMSodium ChlorideNaCl1
332 mMAcid red 271
SpecimenConc.: 3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: Apoferritin in buffer of Amaranth dye (acid red 27 concentration 32 mM)
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R2/1
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

MicroscopyModel: JEOL CRYO ARM 300
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 60000 X / Nominal defocus max: 3500 nm / Nominal defocus min: 500 nm / Cs: 2.55 mm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: JEOL CRYOSPECPORTER
Image recordingAverage exposure time: 2.796 sec. / Electron dose: 59 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 2 / Num. of real images: 722
EM imaging opticsEnergyfilter name: In-column Omega Filter / Energyfilter slit width: 20 eV

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Processing

SoftwareName: PHENIX / Version: 1.20.1_4487: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 7432 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00334512
ELECTRON MICROSCOPYf_angle_d0.55746416
ELECTRON MICROSCOPYf_dihedral_angle_d4.0744512
ELECTRON MICROSCOPYf_chiral_restr0.0374848
ELECTRON MICROSCOPYf_plane_restr0.0046096

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