Crystal structure of thioredoxin 2 from Staphylococcus aureus NCTC8325

Experimental Data Snapshot

  • Resolution: 1.93 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.173 

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This is version 1.3 of the entry. See complete history


Elucidation of the mechanism of disulfide exchange between staphylococcal thioredoxin2 and thioredoxin reductase2: A structural insight.

Bose, M.Bhattacharyya, S.Biswas, R.Roychowdhury, A.Bhattacharjee, A.Ghosh, A.K.Das, A.K.

(2019) Biochimie 160: 1-13

  • DOI: https://doi.org/10.1016/j.biochi.2019.01.019
  • Primary Citation of Related Structures:  
    4RUV, 6A4J

  • PubMed Abstract: 

    The redox homeostasis of cytoplasm is maintained by a series of disulfide exchange reactions mediated by proteins belonging to the thioredoxin superfamily. Thioredoxin and thioredoxin reductase, being the major members of the family, play a key role in oxidative stress response of Staphylococcus aureus. In this report, we have identified and characterised an active thioredoxin system of the mentioned pathogen. Crystal structure of thioredoxin2 (SaTrx2) in its reduced form reveals that it contains the conserved redox active WCXXC motif and a thioredoxin fold. Thioredoxin reductase2 (SaTR2) is a flavoprotein and consists of two Rossmann folds as the binding sites for FAD and NADPH. Crystal structure of the SaTR2 holoenzyme shows that the protein consists of two domains and the catalytic site comprises of an intramolecular disulfide bond formed between two sequentially distal cysteine residues. Biophysical and biochemical studies unveil that SaTrx2 and SaTR2 can physically interact in solution and in the course of sustaining the redox equilibrium, the latter reduces the former. Molecular docking has been performed to illustrate the interface formed between SaTrx2 and SaTR2 during the disulfide exchange reaction.

  • Organizational Affiliation

    Department of Biotechnology and Bioinformatics, North-Eastern Hill University, Shillong, 793022, India.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Thioredoxin114Staphylococcus aureus subsp. aureus NCTC 8325Mutation(s): 0 
Gene Names: SAOUHSC_00834
Find proteins for Q2G000 (Staphylococcus aureus (strain NCTC 8325 / PS 47))
Explore Q2G000 
Go to UniProtKB:  Q2G000
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ2G000
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.93 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.173 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 31.376α = 90
b = 31.376β = 90
c = 94.804γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
StructureStudiodata collection
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-12-09
    Type: Initial release
  • Version 1.1: 2019-02-13
    Changes: Data collection, Database references
  • Version 1.2: 2022-08-24
    Changes: Database references
  • Version 1.3: 2023-09-20
    Changes: Data collection, Refinement description