2ZVS

Crystal structure of the 2[4FE-4S] ferredoxin from escherichia coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.211 

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This is version 1.1 of the entry. See complete history


Literature

Insight into the protein and solvent contributions to the reduction potentials of [4Fe-4S]2+/+ clusters: crystal structures of the Allochromatium vinosum ferredoxin variants C57A and V13G and the homologous Escherichia coli ferredoxin

Saridakis, E.Giastas, P.Efthymiou, G.Thoma, V.Moulis, J.M.Kyritsis, P.Mavridis, I.M.

(2009) J Biol Inorg Chem 14: 783-799

  • DOI: 10.1007/s00775-009-0492-x
  • Primary Citation of Related Structures:  
    2ZVS, 3EUN, 3EXY

  • PubMed Abstract: 
  • The crystal structures of the C57A and V13G molecular variants of Allochromatium vinosum 2[4Fe-4S] ferredoxin (AlvinFd) and that of the homologous ferredoxin from Escherichia coli (EcFd) have been determined at 1.05-, 1.48-, and 1.65-A resolution, respectively ...

    The crystal structures of the C57A and V13G molecular variants of Allochromatium vinosum 2[4Fe-4S] ferredoxin (AlvinFd) and that of the homologous ferredoxin from Escherichia coli (EcFd) have been determined at 1.05-, 1.48-, and 1.65-A resolution, respectively. The present structures combined with cyclic voltammetry studies establish clear effects of the degree of exposure of the cluster with the lowest reduction potential (cluster I) towards less negative reduction potentials (E degrees ). This is better illustrated by V13G AlvinFd (high exposure, E degrees = -594 mV) and EcFd (low exposure, E degrees = -675 mV). In C57A AlvinFd, the movement of the protein backbone, as a result of replacing the noncoordinating Cys57 by Ala, leads to a +50-mV upshift of the potential of the nearby cluster I, by removal of polar interactions involving the thiolate group and adjustment of the hydrogen-bond network involving the cluster atoms. In addition, the present structures and other previously reported accurate structures of this family of ferredoxins indicate that polar interactions of side chains and water molecules with cluster II sulfur atoms, which are absent in the environment of cluster I, are correlated to the approximately 180-250 mV difference between the reduction potentials of clusters I and II. These findings provide insight into the significant effects of subtle structural differences of the protein and solvent environment around the clusters of [4Fe-4S] ferredoxins on their electrochemical properties.


    Organizational Affiliation

    Institute of Physical Chemistry, NCSR Demokritos, Aghia Paraskevi, Athens, Greece.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Uncharacterized ferredoxin-like protein yfhLA, B, C85Escherichia coli K-12Mutation(s): 0 
Gene Names: yfhLb2562JW2546
UniProt
Find proteins for P52102 (Escherichia coli (strain K12))
Explore P52102 
Go to UniProtKB:  P52102
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.211 
  • Space Group: P 62
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.543α = 90
b = 65.543β = 90
c = 132.367γ = 120
Software Package:
Software NamePurpose
PHASERphasing
SHELXL-97refinement
HKL-2000data collection
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-08-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Source and taxonomy, Version format compliance