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- PDB-9fmg: Methylthio-alkane reductase complex -

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Basic information

Entry
Database: PDB / ID: 9fmg
TitleMethylthio-alkane reductase complex
Components
  • (Nitrogenase) x 2
  • Nitrogenase iron protein
KeywordsOXIDOREDUCTASE / Methylthioethanol / dimethyl sulfide / ethylmethyl sulfide / methanethiol / ethylene / methane / ethane / metalloenzyme
Function / homology
Function and homology information


Oxidoreductases; Acting on iron-sulfur proteins as donors / nitrogenase activity / 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/oxidoreductase, component 1 ...: / 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/oxidoreductase, component 1 / Nitrogenase component 1 type Oxidoreductase / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
ADENOSINE-5'-DIPHOSPHATE / ALUMINUM FLUORIDE / FE(8)-S(7) CLUSTER / FeFe cofactor / IRON/SULFUR CLUSTER / Methylthio-alkane reductase iron protein / Methylthio-alkane reductase catalytic subunit alpha / Methylthio-alkane reductase catalytic subunit beta
Similarity search - Component
Biological speciesRhodospirillum rubrum (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.71 Å
AuthorsLago-Maciel, A. / Zarzycki, J. / Prinz, S. / Reif-Trauttmansdorff, T. / Rebelein, J.G.
Funding support Germany, 3items
OrganizationGrant numberCountry
German Research Foundation (DFG)446841743 Germany
Max Planck Society Germany
Max Planck SocietyIMPRS - Principles of microbial life Germany
CitationJournal: Nat Catal / Year: 2025
Title: Methylthio-alkane reductases use nitrogenase metalloclusters for carbon-sulfur bond cleavage.
Authors: Ana Lago-Maciel / Jéssica C Soares / Jan Zarzycki / Charles J Buchanan / Tristan Reif-Trauttmansdorff / Frederik V Schmidt / Stefano Lometto / Nicole Paczia / Jan M Schuller / D Flemming ...Authors: Ana Lago-Maciel / Jéssica C Soares / Jan Zarzycki / Charles J Buchanan / Tristan Reif-Trauttmansdorff / Frederik V Schmidt / Stefano Lometto / Nicole Paczia / Jan M Schuller / D Flemming Hansen / Gabriella T Heller / Simone Prinz / Georg K A Hochberg / Antonio J Pierik / Johannes G Rebelein /
Abstract: Methylthio-alkane reductases convert methylated sulfur compounds to methanethiol and small hydrocarbons, a process with important environmental and biotechnological implications. These enzymes are ...Methylthio-alkane reductases convert methylated sulfur compounds to methanethiol and small hydrocarbons, a process with important environmental and biotechnological implications. These enzymes are classified as nitrogenase-like enzymes, despite lacking the ability to convert dinitrogen to ammonia, raising fundamental questions about the factors controlling their activity and specificity. Here we present the molecular structure of the methylthio-alkane reductase, which reveals large metalloclusters, including the P-cluster and the [FeSC]-cluster, previously found only in nitrogenases. Our findings suggest that distinct metallocluster coordination, surroundings and substrate channels determine the activity of these related metalloenzymes. This study provides new insights into nitrogen fixation, sulfur-compound reduction and hydrocarbon production. We also shed light on the evolutionary history of P-cluster and [FeSC]-cluster-containing reductases emerging before nitrogenases.
History
DepositionJun 6, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Sep 17, 2025Provider: repository / Type: Initial release
Revision 1.0Sep 17, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Sep 17, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Sep 17, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Nitrogenase
B: Nitrogenase
C: Nitrogenase
D: Nitrogenase iron protein
E: Nitrogenase iron protein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)225,94314
Polymers223,1025
Non-polymers2,8419
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: light scattering, mass photometry resulted in a complex of 280 kDa
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Protein , 3 types, 5 molecules ABCDE

#1: Protein Nitrogenase


Mass: 57560.164 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rhodospirillum rubrum (bacteria) / Gene: Rru_A0794 / Production host: Rhodobacter capsulatus (bacteria) / Strain (production host): B10S / References: UniProt: Q2RW97, nitrogenase
#2: Protein Nitrogenase


Mass: 50856.289 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rhodospirillum rubrum (bacteria) / Gene: Rru_A0793 / Production host: Rhodobacter capsulatus (bacteria) / Strain (production host): B10S / References: UniProt: Q2RW98, nitrogenase
#3: Protein Nitrogenase iron protein / Nitrogenase Fe protein / Nitrogenase component II / Nitrogenase reductase


Mass: 31914.785 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rhodospirillum rubrum (bacteria) / Gene: nifH, Rru_A0795 / Production host: Rhodobacter capsulatus (bacteria) / Strain (production host): B10S / References: UniProt: Q2RW96, nitrogenase

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Non-polymers , 6 types, 9 molecules

#4: Chemical ChemComp-S5Q / FeFe cofactor


Mass: 747.356 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: CFe8S9 / Feature type: SUBJECT OF INVESTIGATION
#5: Chemical ChemComp-CLF / FE(8)-S(7) CLUSTER


Mass: 671.215 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Fe8S7 / Feature type: SUBJECT OF INVESTIGATION
#6: Chemical ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE


Mass: 427.201 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C10H15N5O10P2 / Feature type: SUBJECT OF INVESTIGATION / Comment: ADP, energy-carrying molecule*YM
#7: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Mg
#8: Chemical ChemComp-AF3 / ALUMINUM FLUORIDE


Mass: 83.977 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: AlF3
#9: Chemical ChemComp-SF4 / IRON/SULFUR CLUSTER


Mass: 351.640 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Fe4S4 / Feature type: SUBJECT OF INVESTIGATION

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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: Methylthio-alkane reductase complex / Type: COMPLEX / Details: 1:1 complex of catalytic core and reductase dimer / Entity ID: #1-#3 / Source: RECOMBINANT
Molecular weightValue: 0.28 MDa / Experimental value: YES
Source (natural)Organism: Rhodospirillum rubrum (bacteria)
Source (recombinant)Organism: Rhodobacter capsulatus (bacteria) / Strain: B10S
Buffer solutionpH: 7.8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid type: C-flat-2/1
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE / Humidity: 100 % / Chamber temperature: 277 K

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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 defocus max: 2500 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.4particle selection
2EPUimage acquisition
4cryoSPARC4.4CTF correction
7UCSF ChimeraX1.7model fitting
9cryoSPARC4.4initial Euler assignment
10cryoSPARC4.4final Euler assignment
11cryoSPARC4.4classification
12cryoSPARC4.43D reconstruction
13PHENIX1.21model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.71 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 116370 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Atomic model buildingSource name: AlphaFold / Type: in silico model

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