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Open data
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Basic information
Entry | Database: PDB / ID: 7y6p | ||||||
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Title | Cryo-EM structure if bacterioferritin holoform | ||||||
![]() | Bacterioferritin | ||||||
![]() | METAL BINDING PROTEIN / Bacterioferritin | ||||||
Function / homology | ![]() ferroxidase / intracellular sequestering of iron ion / ferroxidase activity / ferric iron binding / iron ion transport / iron ion binding / heme binding / cytosol Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.3 Å | ||||||
![]() | Jobichen, C. / Sivaraman, J. | ||||||
Funding support | 1items
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![]() | ![]() 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. | ||||||
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 666.7 KB | Display | ![]() |
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PDB format | ![]() | 566.9 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 33645MC ![]() 7y6fC ![]() 7y6gC ![]() 8jaxC ![]() 8jb0C M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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1 |
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Components
#1: Protein | Mass: 18434.775 Da / Num. of mol.: 24 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Production host: ![]() ![]() References: UniProt: Q9S2N0, ferroxidase #2: Chemical | ChemComp-FE2 / #3: Chemical | ChemComp-FE / #4: Chemical | ChemComp-HEM / Has ligand of interest | N | |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Bacterioferritin / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Molecular weight | Value: 0.48 MDa / Experimental value: YES |
Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.4 |
Specimen | Conc.: 1.8 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 700 nm |
Image recording | Electron dose: 1.8 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
Software | Name: PHENIX / Version: 1.19.2_4158: / Classification: refinement | ||||||||||||||||||||||||
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 8174 / Symmetry type: POINT | ||||||||||||||||||||||||
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