1FRI

AZOTOBACTER VINELANDII FERREDOXIN I: ALTERATION OF INDIVIDUAL SURFACE CHARGES AND THE [4FE-4S] CLUSTER REDUCTION POTENTIAL


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Work: 0.212 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Azotobacter vinelandii ferredoxin I. Alteration of individual surface charges and the [4FE-4S]2+/+ cluster reduction potential.

Shen, B.Jollie, D.R.Stout, C.D.Diller, T.C.Armstrong, F.A.Gorst, C.M.La Mar, G.N.Stephens, P.J.Burgess, B.K.

(1994) J.Biol.Chem. 269: 8564-8575

  • Primary Citation of Related Structures:  1FRH, 1FRJ, 1FRK, 1FRL, 1FRM

  • PubMed Abstract: 
  • The structures of Azotobacter vinelandii ferredoxin I (AvFdI) and Peptococcus aerogenes ferredoxin (PaFd), near their analogous [4e-4S]2+/+ clusters, are highly conserved (Backes, G., Mino, Y., Loehr, T.M., Meyer, T.E., Cusanovich, M.A., Sweeney, W.V ...

    The structures of Azotobacter vinelandii ferredoxin I (AvFdI) and Peptococcus aerogenes ferredoxin (PaFd), near their analogous [4e-4S]2+/+ clusters, are highly conserved (Backes, G., Mino, Y., Loehr, T.M., Meyer, T.E., Cusanovich, M.A., Sweeney, W.V., Adman, E.T., and Sanders-Loehr, J. (1991) J. Am. Chem. Soc. 11, 2055-2064). Despite these similarities, the reduction potential (E0') of the AvFdI [4Fe-4S]2+/+ cluster is more than 200 mV more negative than that of PaFd. We have tested the contribution that individual amino acid residues make to the control of E0' by converting residues in AvFdI into the corresponding residue in PaFd. Four mutations involved substitutions of negatively charged surface residues with neutral residues and two involved substitution of buried hydrophobic residues. All AvFdI variants were characterized by x-ray crystallography, absorption, CD, EPR, and 1H NMR spectroscopies and by electrochemical methods. For the F25I mutation, significant structural changes occurred that affected the EPR and 1H NMR spectroscopic properties of AvFdI and had a minor influence on E0'. For all other mutations there were no changes in reduction potential. Thus we conclude, that variations in charged surface residues do not account for the observed differences in E0' between the analogous [4Fe-4S]2+/+ cluster of PaFd and AvFdI. These differences are therefore most likely to be due to differences in solvent accessibility.


    Organizational Affiliation

    Department of Molecular Biology and Biochemistry, University of California, Irvine 92717.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
FERREDOXIN
A
106Azotobacter vinelandiiGene Names: fdxA
Find proteins for P00214 (Azotobacter vinelandii)
Go to UniProtKB:  P00214
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SF4
Query on SF4

Download SDF File 
Download CCD File 
A
IRON/SULFUR CLUSTER
Fe4 S4
LJBDFODJNLIPKO-VKOJMFJBAC
 Ligand Interaction
F3S
Query on F3S

Download SDF File 
Download CCD File 
A
FE3-S4 CLUSTER
Fe3 S4
FCXHZBQOKRZXKS-MZMDZPPWAW
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Work: 0.212 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 55.100α = 90.00
b = 55.100β = 90.00
c = 95.340γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1993-09-27 
  • Released Date: 1994-08-31 
  • Deposition Author(s): Stout, C.D.

Revision History 

  • Version 1.0: 1994-08-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance