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- PDB-9cjf: CryoEM structure of alkaline-inactivated nitrogenase MoFe-protein... -

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Basic information

Entry
Database: PDB / ID: 9cjf
TitleCryoEM structure of alkaline-inactivated nitrogenase MoFe-protein in complex with NafT
Components
  • (Nitrogenase molybdenum-iron protein ...) x 2
  • Nitrogenase associated factor T
KeywordsMETAL BINDING PROTEIN / Oxidoreductase
Function / homology
Function and homology information


molybdenum-iron nitrogenase complex / nitrogenase / nitrogenase activity / nitrogen fixation / iron-sulfur cluster binding / ATP binding / metal ion binding
Similarity search - Function
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
Similarity search - Domain/homology
FE(8)-S(7) CLUSTER / : / Chem-ICS / Uncharacterized protein / Nitrogenase molybdenum-iron protein alpha chain / Nitrogenase molybdenum-iron protein beta chain
Similarity search - Component
Biological speciesAzotobacter vinelandii (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.33 Å
AuthorsWarmack, R.A. / Rees, D.C.
Funding support United States, 3items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM152765 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM143836 United States
Howard Hughes Medical Institute (HHMI) United States
CitationJournal: Nat Commun / Year: 2024
Title: Structural evolution of nitrogenase states under alkaline turnover.
Authors: Rebeccah A Warmack / Douglas C Rees /
Abstract: Biological nitrogen fixation, performed by the enzyme nitrogenase, supplies nearly 50% of the bioavailable nitrogen pool on Earth, yet the structural nature of the enzyme intermediates involved in ...Biological nitrogen fixation, performed by the enzyme nitrogenase, supplies nearly 50% of the bioavailable nitrogen pool on Earth, yet the structural nature of the enzyme intermediates involved in this cycle remains ambiguous. Here we present four high resolution cryoEM structures of the nitrogenase MoFe-protein, sampled along a time course of alkaline reaction mixtures under an acetylene atmosphere. This series of structures reveals a sequence of salient changes including perturbations to the inorganic framework of the FeMo-cofactor; depletion of the homocitrate moiety; diminished density around the S2B belt sulfur of the FeMo-cofactor; rearrangements of cluster-adjacent side chains; and the asymmetric displacement of the FeMo-cofactor. We further demonstrate that the nitrogenase associated factor T protein can recognize and bind an alkaline inactivated MoFe-protein in vitro. These time-resolved structures provide experimental support for the displacement of S2B and distortions of the FeMo-cofactor at the E-E intermediates of the substrate reduction mechanism, prior to nitrogen binding, highlighting cluster rearrangements potentially relevant to nitrogen fixation by biological and synthetic clusters.
History
DepositionJul 5, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 18, 2024Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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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 associated factor T
hetero molecules


Theoretical massNumber of molelcules
Total (without water)249,24513
Polymers244,9535
Non-polymers4,2938
Water12,827712
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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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 (bacteria) / References: UniProt: P07328, nitrogenase
#2: Protein Nitrogenase molybdenum-iron protein beta chain / Dinitrogenase / Nitrogenase component I


Mass: 59535.879 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Azotobacter vinelandii (bacteria) / References: UniProt: P07329, nitrogenase

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Protein , 1 types, 1 molecules E

#3: Protein Nitrogenase associated factor T


Mass: 15154.773 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Azotobacter vinelandii (bacteria) / Gene: Avin_01560 / Production host: Escherichia coli (E. coli) / References: UniProt: C1DH13

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Non-polymers , 5 types, 720 molecules

#4: 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
#5: Chemical ChemComp-CLF / FE(8)-S(7) CLUSTER


Mass: 671.215 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Fe8S7
#6: Chemical ChemComp-FE / FE (III) ION


Mass: 55.845 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Fe
#7: Chemical ChemComp-1N7 / CHAPSO / 2-hydroxy-N,N-dimethyl-3-sulfo-N-(3-{[(3beta,5beta,7beta,12beta)-3,7,12-trihydroxy-24-oxocholan-24-yl]amino}propyl)propan-1-aminium


Mass: 631.884 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C32H59N2O8S / Comment: detergent*YM
#8: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 712 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY
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: Heterotetrameric molybdenum-iron protein in complex with one NafT molecule
Type: COMPLEX / Entity ID: #1-#3 / Source: NATURAL
Molecular weightValue: 0.247 MDa / Experimental value: NO
Source (natural)Organism: Azotobacter vinelandii (bacteria)
Source (recombinant)Organism: unidentified (others)
Buffer solutionpH: 7.8
SpecimenConc.: 6 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE-PROPANE

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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: OTHER
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 3000 nm / Nominal defocus min: 600 nm
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.33 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 78918 / Symmetry type: POINT

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