2HZE

Crystal structures of a poxviral glutaredoxin in the oxidized and reduced states show redox-correlated structural changes


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structures of a Poxviral Glutaredoxin in the Oxidized and Reduced States Show Redox-correlated Structural Changes.

Bacik, J.P.Hazes, B.

(2007) J.Mol.Biol. 365: 1545-1558

  • DOI: 10.1016/j.jmb.2006.11.002
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Glutaredoxins act as reducing agents for the large subunit of ribonucleotide reductase (R1) in many prokaryotes and eukaryotes, including humans. The same relationship has been proposed for the glutaredoxin and R1 proteins expressed by all orthopoxvi ...

    Glutaredoxins act as reducing agents for the large subunit of ribonucleotide reductase (R1) in many prokaryotes and eukaryotes, including humans. The same relationship has been proposed for the glutaredoxin and R1 proteins expressed by all orthopoxviruses, including vaccinia, variola, and ectromelia virus. Interestingly, the orthopoxviral proteins share 45% and 78% sequence identity with human glutaredoxin-1 (Grx-1) and R1, respectively. To study structure-function relationships of the vertebrate Grx-1 family, and reveal potential viral adaptations, we have determined crystal structures of the ectromelia virus glutaredoxin, EVM053, in the oxidized and reduced states. The structures show a large redox-induced conformational rearrangement of Tyr21 and Thr22 near the active site. We predict that the movement of Tyr21 is a viral-specific adaptation that increases the redox potential by stabilizing the reduced state. The conformational switch of Thr22 appears to be shared by vertebrate Grx-1 and may affect the strictly conserved Lys20. A crystal packing-induced structural change in residues 68-70 affects the GSH-binding loop, and our structures reveal a potential interaction network that connects the GSH-binding loop and the active site. EVM053 also exhibits a novel cis-proline (Pro53) in a loop that has been shown to contribute to R1-binding in Escherichia coli Grx-1. The cis-peptide bond of Pro53 may be required to promote electrostatic interactions between Lys52 and the C-terminal carboxylate of R1. Finally, dimethylarsenite was covalently attached to Cys23 in one reduced EVM053 structure and our preliminary data show that EVM053 has dimethylarsenate reductase activity.


    Organizational Affiliation

    Department of Medical Microbiology and Immunology, 1-15 Medical Sciences Building, University of Alberta, Edmonton, Alberta, Canada T6G 2H7.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutaredoxin-1
A
114Ectromelia virus (strain Moscow)Mutation(s): 0 
Find proteins for Q8JLF5 (Ectromelia virus (strain Moscow))
Go to UniProtKB:  Q8JLF5
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Glutaredoxin-1
B
114Ectromelia virus (strain Moscow)Mutation(s): 0 
Find proteins for Q8JLF5 (Ectromelia virus (strain Moscow))
Go to UniProtKB:  Q8JLF5
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CAS
Query on CAS
B
L-PEPTIDE LINKINGC5 H12 As N O2 SCYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.186 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 62.627α = 90.00
b = 66.668β = 90.00
c = 108.096γ = 90.00
Software Package:
Software NamePurpose
ADSCdata collection
MOSFLMdata reduction
REFMACrefinement
XFITdata reduction
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2006-08-08 
  • Released Date: 2006-11-21 
  • Deposition Author(s): Bacik, J.P., Hazes, B.

Revision History 

  • Version 1.0: 2006-11-21
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance