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- PDB-7y6g: Cryo-EM structure of bacterioferritin holoform 1a -

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Basic information

Entry
Database: PDB / ID: 7y6g
TitleCryo-EM structure of bacterioferritin holoform 1a
ComponentsBacterioferritin
KeywordsMETAL BINDING PROTEIN / Bacterioferritin
Function / homology
Function and homology information


ferroxidase / ferroxidase activity / ferric iron binding / iron ion transport / intracellular iron ion homeostasis / iron ion binding / heme binding / cytosol
Similarity search - Function
Bacterioferritin signature. / Bacterioferritin / 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
: / : / PROTOPORPHYRIN IX CONTAINING FE / Bacterioferritin
Similarity search - Component
Biological speciesStreptomyces coelicolor (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsJobichen, C. / Sivaraman, J.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: PNAS Nexus / Year: 2023
Title: Bacterioferritin nanocage structures uncover the biomineralization process in ferritins.
Authors: Chacko Jobichen / Tan Ying Chong / Rajesh Rattinam / Sandip Basak / Mahalashmi Srinivasan / Yeu Khai Choong / Kannu Priya Pandey / Tran Bich Ngoc / Jian Shi / Jayaraman Angayarkanni / J Sivaraman /
Abstract: Iron is an essential element involved in various metabolic processes. The ferritin family of proteins forms nanocage assembly and is involved in iron oxidation, storage, and mineralization. Although ...Iron is an essential element involved in various metabolic processes. The ferritin family of proteins forms nanocage assembly and is involved in iron oxidation, storage, and mineralization. Although several structures of human ferritins and bacterioferritins have been solved, there is still no complete structure that shows both the trapped Fe-biomineral cluster and the nanocage. Furthermore, whereas the mechanism of iron trafficking has been explained using various approaches, structural details on the biomineralization process (i.e. the formation of the mineral itself) are generally lacking. Here, we report the cryo-electron microscopy (cryo-EM) structures of apoform and biomineral bound form (holoforms) of the bacterioferritin (ScBfr) nanocage and the subunit crystal structure. The holoforms show different stages of Fe-biomineral accumulation inside the nanocage, in which the connections exist in two of the fourfold channels of the nanocage between the C-terminal of the ScBfr monomers and the Fe-biomineral cluster. The mutation and truncation of the bacterioferritin residues involved in these connections significantly reduced the iron and phosphate binding in comparison with those of the wild type and together explain the underlying mechanism. Collectively, our results represent a prototype for the bacterioferritin nanocage, which reveals insight into its biomineralization and the potential channel for bacterioferritin-associated iron trafficking.
History
DepositionJun 20, 2022Deposition site: PDBJ / Processing site: PDBJ
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

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


Theoretical massNumber of molelcules
Total (without water)452,45783
Polymers442,43524
Non-polymers10,02359
Water00
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein ...
Bacterioferritin / BFR


Mass: 18434.775 Da / Num. of mol.: 24
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Streptomyces coelicolor (bacteria) / Strain: ATCC BAA-471 / A3(2) / M145 / Gene: bfr, SCO2113, SC6E10.07
Production host: Escherichia coli 'BL21-Gold(DE3)pLysS AG' (bacteria)
References: UniProt: Q9S2N0, ferroxidase
#2: Chemical...
ChemComp-FE2 / FE (II) ION


Mass: 55.845 Da / Num. of mol.: 24 / Source method: obtained synthetically / Formula: Fe
#3: Chemical...
ChemComp-FE / FE (III) ION


Mass: 55.845 Da / Num. of mol.: 23 / Source method: obtained synthetically / Formula: Fe
#4: Chemical
ChemComp-HEM / PROTOPORPHYRIN IX CONTAINING FE / HEME


Mass: 616.487 Da / Num. of mol.: 12 / Source method: obtained synthetically / Formula: C34H32FeN4O4
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: Bacterioferritin / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.48 MDa / Experimental value: YES
Source (natural)Organism: Streptomyces coelicolor (bacteria)
Source (recombinant)Organism: Escherichia coli 'BL21-Gold(DE3)pLysS AG' (bacteria)
Buffer solutionpH: 7.4
SpecimenConc.: 1.8 mg/ml / Embedding 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 FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 700 nm
Image recordingElectron dose: 1.8 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 5200 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00331968
ELECTRON MICROSCOPYf_angle_d0.57543354
ELECTRON MICROSCOPYf_dihedral_angle_d6.1564204
ELECTRON MICROSCOPYf_chiral_restr0.0334806
ELECTRON MICROSCOPYf_plane_restr0.0045596

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