6MOS

Structure of thioredoxin 1 from the thermophilic eubacterium Thermosipho africanus TCF52B


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.212 

wwPDB Validation 3D Report Full Report



Literature

Structure and function of the putative thioredoxin 1 from the thermophilic eubacterium Thermosipho africanus strain TCF52B.

Sahtout, N.Kuttiyatveetil, J.R.A.Sanders, D.A.R.

(2019) Biochim Biophys Acta Proteins Proteom 1867: 426-433

  • DOI: 10.1016/j.bbapap.2019.01.011
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The thioredoxin system is a ubiquitous oxidoreductase system that consists of the enzyme thioredoxin reductase (TrxR), its cofactor nicotinamide adenine dinucleotide phosphate (NAD(P)H) and the protein thioredoxin (Trx). The system has been comprehen ...

    The thioredoxin system is a ubiquitous oxidoreductase system that consists of the enzyme thioredoxin reductase (TrxR), its cofactor nicotinamide adenine dinucleotide phosphate (NAD(P)H) and the protein thioredoxin (Trx). The system has been comprehensively studied from many organisms, such as Escherichia coli (E. coli); however, structural and functional analysis of this system from thermophilic bacteria has not been as extensive. In this study, Thermosipho africanus, a thermophilic eubacterium, Trx1 (TaTrx1) was successfully cloned, overexpressed and purified, to greater than 95% purity. Inspection of the amino acid sequence of TaTrx1 categorized the protein as a putative Trx. Its ability to reduce the interchain disulfides of insulin, in the presence of dithiothreitol, provided further evidence to suggest that it was a Trx. The three dimensional structure of the protein, determined using X-ray crystallography, provided additional evidence for this. The crystal structure was solved in space group P2 1 2 1 2 1 to 1.8 Ă resolution and showed the characteristic thioredoxin fold; four β-strands surrounded by three α-helices. The active site of TaTrx1 contained two cysteines that formed a disulfide bridge, and was structurally similar to the active site of EcTrx1. Further studies indicated that TaTrx1 was far more stable than Trx1 of E. coli (EcTrx1). The protein could withstand both higher temperatures and higher concentrations of guanidine hydrochloride before denaturing. Our studies have therefore identified a novel thermophilic putative Trx that structurally and functionally behaves like a Trx.


    Related Citations: 
    • Putative thioredoxin Trx1 from Thermosipho africanus strain TCF52B: expression, purification and structural determination using S-SAD.
      Sahtout, N., Kuttiyatveetil, J.R., Fodje, M., Sanders, D.A.
      (2016) Acta Crystallogr F Struct Biol Commun 72: 443

    Organizational Affiliation

    Department of Chemistry, College of Arts and Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada. Electronic address: david.sanders@usask.ca.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thioredoxin
A
117Thermosipho africanus TCF52BMutation(s): 0 
Gene Names: THA_37
Find proteins for B7IEN1 (Thermosipho africanus (strain TCF52B))
Go to UniProtKB:  B7IEN1
Protein Feature View
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
TAM
Query on TAM

Download CCD File 
A
TRIS(HYDROXYETHYL)AMINOMETHANE
C7 H17 N O3
GKODZWOPPOTFGA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.212 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.454α = 90
b = 41.023β = 90
c = 55.822γ = 90
Software Package:
Software NamePurpose
AutoPROCdata collection
SCALAdata scaling
PHENIXrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2019-08-14
    Type: Initial release