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: 1.80 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 

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:  
    2HZF, 2HZE

  • 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 orthopoxviruses, including vaccinia, variola, and ectromelia virus ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Glutaredoxin-1A114Ectromelia virus MoscowMutation(s): 0 
Gene Names: EVM053
EC: 1.8.5.1
Find proteins for Q8JLF5 (Ectromelia virus (strain Moscow))
Explore Q8JLF5 
Go to UniProtKB:  Q8JLF5
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Glutaredoxin-1B114Ectromelia virus MoscowMutation(s): 1 
Gene Names: EVM053
Find proteins for Q8JLF5 (Ectromelia virus (strain Moscow))
Explore Q8JLF5 
Go to UniProtKB:  Q8JLF5
Protein Feature View
Expand
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CAS
Query on CAS
BL-PEPTIDE LINKINGC5 H12 As N O2 SCYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.627α = 90
b = 66.668β = 90
c = 108.096γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
ADSCdata collection
MOSFLMdata reduction
CCP4data scaling
XFITdata reduction

Structure Validation

View Full Validation Report



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
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance