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- PDB-7uta: CryoEM structure of Azotobacter vinelandii nitrogenase complex (2... -

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Basic information

Entry
Database: PDB / ID: 7uta
TitleCryoEM structure of Azotobacter vinelandii nitrogenase complex (2:1 FeP:MoFeP) inhibited by BeFx during catalytic N2 reduction
Components
  • (Nitrogenase molybdenum-iron protein ...) x 2
  • Nitrogenase iron protein gamma chain
KeywordsOXIDOREDUCTASE / nitrogenase / MoFeP / nitrogen fixation
Function / homology
Function and homology information


molybdenum-iron nitrogenase complex / nitrogenase / nitrogenase activity / nitrogen fixation / iron-sulfur cluster binding / 4 iron, 4 sulfur cluster binding / ATP binding / metal ion binding
Similarity search - Function
Nitrogenase iron protein NifH / NifH/frxC family / NifH/chlL conserved site / 4Fe-4S iron sulfur cluster binding proteins, NifH/frxC family / NifH/frxC family signature 2. / NifH/frxC family signature 1. / NIFH_FRXC family profile. / Nitrogenase molybdenum-iron protein beta chain, N-terminal / Domain of unknown function (DUF3364) / Nitrogenase molybdenum-iron protein alpha chain ...Nitrogenase iron protein NifH / NifH/frxC family / NifH/chlL conserved site / 4Fe-4S iron sulfur cluster binding proteins, NifH/frxC family / NifH/frxC family signature 2. / NifH/frxC family signature 1. / NIFH_FRXC family profile. / Nitrogenase molybdenum-iron protein beta chain, N-terminal / Domain of unknown function (DUF3364) / Nitrogenase molybdenum-iron protein alpha chain / Nitrogenase molybdenum-iron protein beta chain / Nitrogenase component 1, alpha chain / Nitrogenase component 1, conserved site / Nitrogenases component 1 alpha and beta subunits signature 2. / Nitrogenases component 1 alpha and beta subunits signature 1. / Nitrogenase/oxidoreductase, component 1 / : / Nitrogenase component 1 type Oxidoreductase / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
BERYLLIUM / ADENOSINE-5'-DIPHOSPHATE / FE(8)-S(7) CLUSTER / : / 3-HYDROXY-3-CARBOXY-ADIPIC ACID / Chem-ICS / IRON/SULFUR CLUSTER / Nitrogenase iron protein / Nitrogenase molybdenum-iron protein beta chain / Nitrogenase molybdenum-iron protein alpha chain
Similarity search - Component
Biological speciesAzotobacter vinelandii DJ (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.4 Å
AuthorsRutledge, H.L. / Cook, B.D. / Nguyen, H.P.M. / Tezcan, F.A. / Herzik, M.A.
Funding support United States, 4items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM099813 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM138206 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)T32 GM008326 United States
National Aeronautic Space Administration (NASA, United States)80NSSC18M0093 United States
CitationJournal: Science / Year: 2022
Title: Structures of the nitrogenase complex prepared under catalytic turnover conditions.
Authors: Hannah L Rutledge / Brian D Cook / Hoang P M Nguyen / Mark A Herzik / F Akif Tezcan /
Abstract: The enzyme nitrogenase couples adenosine triphosphate (ATP) hydrolysis to the multielectron reduction of atmospheric dinitrogen into ammonia. Despite extensive research, the mechanistic details of ...The enzyme nitrogenase couples adenosine triphosphate (ATP) hydrolysis to the multielectron reduction of atmospheric dinitrogen into ammonia. Despite extensive research, the mechanistic details of ATP-dependent energy transduction and dinitrogen reduction by nitrogenase are not well understood, requiring new strategies to monitor its structural dynamics during catalytic action. Here, we report cryo-electron microscopy structures of the nitrogenase complex prepared under enzymatic turnover conditions. We observe that asymmetry governs all aspects of the nitrogenase mechanism, including ATP hydrolysis, protein-protein interactions, and catalysis. Conformational changes near the catalytic iron-molybdenum cofactor are correlated with the nucleotide-hydrolysis state of the enzyme.
History
DepositionApr 26, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Aug 17, 2022Provider: repository / Type: Initial release
Revision 1.1Aug 31, 2022Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID
Revision 1.2Feb 14, 2024Group: Data collection / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_3d_fitting_list / pdbx_initial_refinement_model
Item: _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id ..._em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Nitrogenase molybdenum-iron protein alpha chain
B: Nitrogenase molybdenum-iron protein beta chain
C: Nitrogenase molybdenum-iron protein alpha chain
D: Nitrogenase molybdenum-iron protein beta chain
E: Nitrogenase iron protein gamma chain
F: Nitrogenase iron protein gamma chain
G: Nitrogenase iron protein gamma chain
H: Nitrogenase iron protein gamma chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)361,97730
Polymers355,9918
Non-polymers5,98722
Water99155
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: The assembly is an inhibited complex that formed during catalysis on the grid itself. This complex is part of a heterogeneous mixture.
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Nitrogenase molybdenum-iron protein ... , 2 types, 4 molecules ACBD

#1: Protein Nitrogenase molybdenum-iron protein alpha chain / Dinitrogenase / Nitrogenase component I


Mass: 55363.043 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Azotobacter vinelandii DJ (bacteria) / References: UniProt: P07328, nitrogenase
#2: Protein Nitrogenase molybdenum-iron protein beta chain / Dinitrogenase


Mass: 59535.879 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Azotobacter vinelandii DJ (bacteria) / References: UniProt: C1DGZ8, nitrogenase

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Protein , 1 types, 4 molecules EFGH

#3: Protein
Nitrogenase iron protein gamma chain / Nitrogenase Fe protein / Nitrogenase component II / Nitrogenase reductase


Mass: 31548.240 Da / Num. of mol.: 4 / Source method: isolated from a natural source / Source: (natural) Azotobacter vinelandii DJ (bacteria) / Strain: DJ / ATCC BAA-1303 / References: UniProt: C1DGZ6, nitrogenase

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Non-polymers , 9 types, 77 molecules

#4: Chemical ChemComp-HCA / 3-HYDROXY-3-CARBOXY-ADIPIC ACID


Mass: 206.150 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C7H10O7 / Feature type: SUBJECT OF INVESTIGATION
#5: Chemical ChemComp-ICS / iron-sulfur-molybdenum cluster with interstitial carbon


Mass: 787.451 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: CFe7MoS9 / Feature type: SUBJECT OF INVESTIGATION
#6: Chemical ChemComp-CLF / FE(8)-S(7) CLUSTER


Mass: 671.215 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Fe8S7 / Feature type: SUBJECT OF INVESTIGATION
#7: Chemical ChemComp-FE / FE (III) ION


Mass: 55.845 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Fe
#8: Chemical ChemComp-SF4 / IRON/SULFUR CLUSTER


Mass: 351.640 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Fe4S4 / Feature type: SUBJECT OF INVESTIGATION
#9: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Mg
#10: Chemical
ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE


Mass: 427.201 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C10H15N5O10P2 / Feature type: SUBJECT OF INVESTIGATION / Comment: ADP, energy-carrying molecule*YM
#11: Chemical
ChemComp-0BE / BERYLLIUM


Mass: 9.012 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Be / Feature type: SUBJECT OF INVESTIGATION
#12: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 55 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY

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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: BeFx inhibited Azotobacter vinelandii nitrogenase complex. Inhibition occurred during catalytic N2 reduction
Type: COMPLEX
Details: Wild-type MoFeP and FeP were purified from the native organism, Azotobacter vinelandii
Entity ID: #1-#3 / Source: NATURAL
Molecular weightValue: 0.35921 MDa / Experimental value: NO
Source (natural)Organism: Azotobacter vinelandii DJ (bacteria)
Buffer solutionpH: 8
Details: Solutions were prepared and filtered immediately prior to the experiment.
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMTRIS(HOCH2)3CNH21
225 mMsodium chlorideNaCl1
SpecimenConc.: 5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: 1.44 mg/mL MoFeP 3.6 mg/mL FeP
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: UltrAuFoil R1.2/1.3
VitrificationInstrument: HOMEMADE PLUNGER / Cryogen name: ETHANE-PROPANE / Humidity: 95 % / Chamber temperature: 277 K / Details: Custom manual plunger. Greater than 95% humidity.

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 165000 X / Nominal defocus max: 1500 nm / Nominal defocus min: 500 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm / Alignment procedure: ZEMLIN TABLEAU
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Temperature (max): 123 K / Temperature (min): 93 K
Image recordingElectron dose: 65 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 2 / Num. of real images: 8083

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Processing

EM software
IDNameVersionCategory
2RELIONparticle selection
3EPU2image acquisition
5CTFFIND4.1CTF correction
8PHENIXmodel fitting
10RELION4.0/beta2initial Euler assignment
11RELION4.0/beta2final Euler assignment
12cryoSPARC3.3.2classification
13cryoSPARC3.3.23D reconstruction
14PHENIXmodel refinement
15Cootmodel refinement
CTF correctionType: PHASE FLIPPING ONLY
Particle selectionNum. of particles selected: 2628629
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 72125 / Num. of class averages: 3 / Symmetry type: POINT
Atomic model buildingPDB-ID: 4WZA

4wza


Accession code: 4WZA / Source name: PDB / Type: experimental model

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