3MIN

NITROGENASE MOFE PROTEIN FROM AZOTOBACTER VINELANDII, OXIDIZED STATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Redox-dependent structural changes in the nitrogenase P-cluster.

Peters, J.W.Stowell, M.H.Soltis, S.M.Finnegan, M.G.Johnson, M.K.Rees, D.C.

(1997) Biochemistry 36: 1181-1187

  • DOI: 10.1021/bi9626665
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The structure of the nitrogenase MoFe-protein from Azotobacter vinelandii has been refined to 2.0 A resolution in two oxidation states. EPR studies on the crystals indicate that the structures correspond to the spectroscopically assigned oxidized (P( ...

    The structure of the nitrogenase MoFe-protein from Azotobacter vinelandii has been refined to 2.0 A resolution in two oxidation states. EPR studies on the crystals indicate that the structures correspond to the spectroscopically assigned oxidized (P(OX)/M(OX)) and the native or dithionite-reduced (P(N)/M(N)) forms of the enzyme. Both MoFe-protein structures are essentially identical, with the exception of the P-cluster. The MoFe-protein P-cluster in each state is found to contain eight Fe and seven S atoms. Interconversion between the two redox states involves movement of two Fe atoms and an exchange of protein coordination for ligands supplied by a central S atom. In the oxidized P(OX) state, the cluster is coordinated by the protein through six cysteine ligands, Ser-beta188 O gamma, and the backbone amide of Cys-alpha88. In the native P(N) state, Ser-beta188 O gamma and the amide N of Cys-alpha88 no longer coordinate the cluster due to movement of their coordinated Fe atoms toward the central sulfur. Consequently, this central sulfur adopts a distorted octahedral environment with six surrounding Fe atoms. A previously described model of the P-cluster containing 8Fe-8S likely reflects the inappropriate modeling of a single structure to a mixture of these two P-cluster redox states. These observed redox-mediated structural changes of the P-cluster suggest a role for this cluster in coupling electron transfer and proton transfer in nitrogenase.


    Related Citations: 
    • Structural Models for the Metal Centers in the Nitrogenase Molybdenum-Iron Protein
      Kim, J.,Rees, D.C.
      (1992) Science 257: 1677
    • Crystallographic Structure and Functional Implications of the Nitrogenase Molybdenum-Iron Protein from Azotobacter Vinelandii
      Kim, J.,Rees, D.C.
      (1992) Nature 360: 553


    Organizational Affiliation

    Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena 91125, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
NITROGENASE MOLYBDENUM IRON PROTEIN
A, C
491Azotobacter vinelandiiMutation(s): 0 
Gene Names: nifD
EC: 1.18.6.1
Find proteins for P07328 (Azotobacter vinelandii)
Go to UniProtKB:  P07328
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
NITROGENASE MOLYBDENUM IRON PROTEIN
B, D
522Azotobacter vinelandiiMutation(s): 0 
Gene Names: nifK
EC: 1.18.6.1
Find proteins for P07329 (Azotobacter vinelandii)
Go to UniProtKB:  P07329
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CFM
Query on CFM

Download SDF File 
Download CCD File 
A, C
FE-MO-S CLUSTER
Fe7 Mo S9
UZRXIPMKRKMLQF-VGXFRCDIAP
 Ligand Interaction
CA
Query on CA

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Download CCD File 
B, D
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
CLF
Query on CLF

Download SDF File 
Download CCD File 
B, D
FE(8)-S(7) CLUSTER
Fe8 S7
JKVMXLBGZBULKV-DHHOTQGYAO
 Ligand Interaction
HCA
Query on HCA

Download SDF File 
Download CCD File 
A, C
3-HYDROXY-3-CARBOXY-ADIPIC ACID
C7 H10 O7
XKJVEVRQMLKSMO-SSDOTTSWSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.206 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 108.000α = 90.00
b = 131.300β = 110.70
c = 81.000γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing
X-PLORmodel building
X-PLORrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-04-01
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance