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Open data
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Basic information
Entry | Database: PDB / ID: 8oie | |||||||||
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Title | Iron Nitrogenase Complex from Rhodobacter capsulatus | |||||||||
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![]() | OXIDOREDUCTASE / nitrogen fixation / Fe nitrogenase | |||||||||
Function / homology | ![]() nitrogenase / : / nitrogenase activity / nitrogen fixation / iron-sulfur cluster binding / 4 iron, 4 sulfur cluster binding / iron ion binding / ATP binding / metal ion binding Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.35 Å | |||||||||
![]() | Schmidt, F.V. / Schulz, L. / Zarzycki, J. / Prinz, S. / Erb, T.J. / Rebelein, J.G. | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structural insights into the iron nitrogenase complex. Authors: Frederik V Schmidt / Luca Schulz / Jan Zarzycki / Simone Prinz / Niels N Oehlmann / Tobias J Erb / Johannes G Rebelein / ![]() Abstract: Nitrogenases are best known for catalyzing the reduction of dinitrogen to ammonia at a complex metallic cofactor. Recently, nitrogenases were shown to reduce carbon dioxide (CO) and carbon monoxide ...Nitrogenases are best known for catalyzing the reduction of dinitrogen to ammonia at a complex metallic cofactor. Recently, nitrogenases were shown to reduce carbon dioxide (CO) and carbon monoxide to hydrocarbons, offering a pathway to recycle carbon waste into hydrocarbon products. Among the three nitrogenase isozymes, the iron nitrogenase has the highest wild-type activity for the reduction of CO, but the molecular architecture facilitating these activities has remained unknown. Here, we report a 2.35-Å cryogenic electron microscopy structure of the ADP·AlF-stabilized iron nitrogenase complex from Rhodobacter capsulatus, revealing an [FeSC-(R)-homocitrate] cluster in the active site. The enzyme complex suggests that the iron nitrogenase G subunit is involved in cluster stabilization and substrate channeling and confers specificity between nitrogenase reductase and catalytic component proteins. Moreover, the structure highlights a different interface between the two catalytic halves of the iron and the molybdenum nitrogenase, potentially influencing the intrasubunit 'communication' and thus the nitrogenase mechanism. | |||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 644.5 KB | Display | ![]() |
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PDB format | ![]() | 521.9 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.9 MB | Display | ![]() |
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Full document | ![]() | 1.9 MB | Display | |
Data in XML | ![]() | 95.5 KB | Display | |
Data in CIF | ![]() | 150.8 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 16890MC ![]() 8pbbC 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
-Protein , 2 types, 6 molecules AFDEIJ
#1: Protein | Mass: 60221.117 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Gene: anfD / Production host: ![]() #4: Protein | Mass: 30212.590 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Gene: anfH, nifH, RCAP_rcc00585 / Production host: ![]() |
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-Nitrogenase iron-iron ... , 2 types, 4 molecules BGCH
#2: Protein | Mass: 13414.546 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Gene: anfG, RCAP_rcc00587 / Production host: ![]() #3: Protein | Mass: 50776.398 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Gene: anfK, RCAP_rcc00588 / Production host: ![]() |
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-Non-polymers , 8 types, 485 molecules ![](data/chem/img/S5Q.gif)
![](data/chem/img/HCA.gif)
![](data/chem/img/CLF.gif)
![](data/chem/img/ADP.gif)
![](data/chem/img/MG.gif)
![](data/chem/img/AF3.gif)
![](data/chem/img/SF4.gif)
![](data/chem/img/HOH.gif)
![](data/chem/img/HCA.gif)
![](data/chem/img/CLF.gif)
![](data/chem/img/ADP.gif)
![](data/chem/img/MG.gif)
![](data/chem/img/AF3.gif)
![](data/chem/img/SF4.gif)
![](data/chem/img/HOH.gif)
#5: Chemical | #6: Chemical | #7: Chemical | #8: Chemical | ChemComp-ADP / #9: Chemical | ChemComp-MG / #10: Chemical | ChemComp-AF3 / #11: Chemical | #12: Water | ChemComp-HOH / | |
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-Details
Has ligand of interest | Y |
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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: Iron Nitrogenase Complex from Rhodobacter capsulatus / Type: COMPLEX / Entity ID: #1-#4 / Source: RECOMBINANT |
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Molecular weight | Value: 0.36 MDa / Experimental value: YES |
Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() |
Buffer solution | pH: 7.8 Details: 50 mM TRIS (pH = 7.8) 200 mM NaCl 5 mM sodium dithionite |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R2/1 |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 90 % |
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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: 500 nm |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 3014316 | ||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 2.35 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 218653 / Symmetry type: POINT |