1FRX

STRUCTURE AND PROPERTIES OF C20S FDI MUTANT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Work: 0.229 
  • R-Value Observed: 0.229 

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This is version 1.2 of the entry. See complete history


Literature

Site-directed mutagenesis of Azotobacter vinelandii ferredoxin I: cysteine ligation of the [4Fe-4S] cluster with protein rearrangement is preferred over serine ligation.

Shen, B.Jollie, D.R.Diller, T.C.Stout, C.D.Stephens, P.J.Burgess, B.K.

(1995) Proc Natl Acad Sci U S A 92: 10064-10068

  • DOI: 10.1073/pnas.92.22.10064
  • Primary Citation of Related Structures:  
    1FRX

  • PubMed Abstract: 
  • The [4Fe-4S] cluster of Azotobacter vinelandii ferredoxin I receives three of its four ligands from a Cys-Xaa-Xaa-Cys-Xaa-Xaa-Cys sequence at positions 39-45 while the fourth ligand, Cys20, is provided by a distal portion of the sequence. Previously we reported that the site-directed mutation of Cys20 to Ala (C20A protein) resulted in the formation of a new [4Fe-4S] cluster that obtained its fourth ligand from Cys24, a free cysteine in the native structure ...

    The [4Fe-4S] cluster of Azotobacter vinelandii ferredoxin I receives three of its four ligands from a Cys-Xaa-Xaa-Cys-Xaa-Xaa-Cys sequence at positions 39-45 while the fourth ligand, Cys20, is provided by a distal portion of the sequence. Previously we reported that the site-directed mutation of Cys20 to Ala (C20A protein) resulted in the formation of a new [4Fe-4S] cluster that obtained its fourth ligand from Cys24, a free cysteine in the native structure. That ligand exchange required significant protein rearrangement. Here we report the conversion of Cys20 to Ser (C20S protein), which gives the protein the opportunity either to retain the native structure and use the Ser20 O gamma as a ligand or to rearrange and use Cys24. X-ray crystallography demonstrates that the cluster does not use the Ser20 O gamma as a ligand; rather it rearranges to use Cys24. In the C20S protein the [4Fe-4S] cluster has altered stability and redox properties relative to either C20A or the native protein.


    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
FERREDOXIN A106Azotobacter vinelandiiMutation(s): 0 
Gene Names: fdxA
Find proteins for P00214 (Azotobacter vinelandii)
Explore P00214 
Go to UniProtKB:  P00214
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SF4
Query on SF4

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

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Work: 0.229 
  • R-Value Observed: 0.229 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.25α = 90
b = 55.25β = 90
c = 95.45γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 1994-07-13 
  • Released Date: 1994-08-31 
  • Deposition Author(s): Stout, C.D.

Revision History  (Full details and data files)

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