6G61

Crystal structure of thioredoxin O1 from Arabidopsis thaliana in oxidized state


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.221 

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Literature

MitochondrialArabidopsis thalianaTRXo Isoforms Bind an Iron−Sulfur Cluster and Reduce NFU Proteins In Vitro.

Zannini, F.Roret, T.Przybyla-Toscano, J.Dhalleine, T.Rouhier, N.Couturier, J.

(2018) Antioxidants (Basel) 7

  • DOI: 10.3390/antiox7100142
  • Primary Citation of Related Structures:  
    6G62, 6G61

  • PubMed Abstract: 
  • In plants, the mitochondrial thioredoxin (TRX) system generally comprises only one or two isoforms belonging to the TRX h or o classes, being less well developed compared to the numerous isoforms found in chloroplasts. Unlike most other plant species, Arabidopsis thaliana possesses two TRXo isoforms whose physiological functions remain unclear ...

    In plants, the mitochondrial thioredoxin (TRX) system generally comprises only one or two isoforms belonging to the TRX h or o classes, being less well developed compared to the numerous isoforms found in chloroplasts. Unlike most other plant species, Arabidopsis thaliana possesses two TRXo isoforms whose physiological functions remain unclear. Here, we performed a structure⁻function analysis to unravel the respective properties of the duplicated TRXo1 and TRXo2 isoforms. Surprisingly, when expressed in Escherichia coli , both recombinant proteins existed in an apo-monomeric form and in a homodimeric iron⁻sulfur (Fe-S) cluster-bridged form. In TRXo2, the [4Fe-4S] cluster is likely ligated in by the usual catalytic cysteines present in the conserved Trp-Cys-Gly-Pro-Cys signature. Solving the three-dimensional structure of both TRXo apo-forms pointed to marked differences in the surface charge distribution, notably in some area usually participating to protein⁻protein interactions with partners. However, we could not detect a difference in their capacity to reduce nitrogen-fixation-subunit-U (NFU)-like proteins, NFU4 or NFU5, two proteins participating in the maturation of certain mitochondrial Fe-S proteins and previously isolated as putative TRXo1 partners. Altogether, these results suggest that a novel regulation mechanism may prevail for mitochondrial TRXs o, possibly existing as a redox-inactive Fe-S cluster-bound form that could be rapidly converted in a redox-active form upon cluster degradation in specific physiological conditions.


    Organizational Affiliation

    Université de Lorraine, Inra, IAM, F-54000 Nancy, France. jeremy.couturier@univ-lorraine.fr.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Thioredoxin O1, mitochondrialA133Arabidopsis thalianaMutation(s): 0 
Gene Names: At2g35010F19I3.24
UniProt
Find proteins for O64764 (Arabidopsis thaliana)
Explore O64764 
Go to UniProtKB:  O64764
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.221 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.151α = 90
b = 39.242β = 90
c = 79.34γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
MOLREPphasing
Cootmodel building
MolProbitymodel building

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-24
    Type: Initial release