1R26

Crystal structure of thioredoxin from Trypanosoma brucei brucei

• PDB DOI: https://doi.org/10.2210/pdb1R26/pdb

• Classification: ELECTRON TRANSPORT
• Organism(s): Trypanosoma brucei brucei
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2003-09-26 Released: 2003-12-09 
• Deposition Author(s): Friemann, R., Schmidt, H., Ramaswamy, S., Forstner, M., Krauth-Siegel, R.L., Eklund, H.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 0.198 
• R-Value Work: 0.168 
• R-Value Observed: 0.169 

Starting Model: experimental

Literature

Structure of thioredoxin from Trypanosoma brucei brucei

Friemann, R., Schmidt, H., Ramaswamy, S., Forstner, M., Krauth-Siegel, R.L., Eklund, H.

(2003) FEBS Lett 554: 301-305

• PubMed: 14623083 
• DOI: https://doi.org/10.1016/s0014-5793(03)01173-6
• Primary Citation of Related Structures:  
  1R26


• PubMed Abstract: 
  

  The three-dimensional structure of thioredoxin from Trypanosoma brucei brucei has been determined at 1.4 A resolution. The overall structure is more similar to that of human thioredoxin than to any other thioredoxin structure. The most striking difference to other thioredoxins is the absence of a buried carboxylate behind the active site cysteines. Instead of the common Asp, there is a Trp that binds an ordered water molecule probably involved in the protonation/deprotonation of the more buried cysteine during catalysis. The conserved Trp in the WCGPC sequence motif has an exposed position that can interact with target proteins.

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Organizational Affiliation: 

Department of Molecular Biosciences, Swedish University of Agricultural Sciences, Biomedical Center, Box 590, S-75124 Uppsala, Sweden.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 14.48 kDa 
• Atom Count: 1,030 
• Modelled Residue Count: 113 
• Deposited Residue Count: 125 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Thioredoxin	A	125	Trypanosoma brucei brucei	Mutation(s): 0  Gene Names: trx
UniProt
Find proteins for Q9NG23 (Trypanosoma brucei brucei) Explore Q9NG23  Go to UniProtKB:  Q9NG23

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 0.198 
• R-Value Work: 0.168 
• R-Value Observed: 0.169 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 37.878	α = 90
b = 51.725	β = 90
c = 57.389	γ = 90

Software Package:

Software Name	Purpose
d*TREK	data scaling
d*TREK	data reduction
AMoRE	phasing
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 2003-12-09 
Deposition Author(s): Friemann, R., Schmidt, H., Ramaswamy, S., Forstner, M., Krauth-Siegel, R.L., Eklund, H.

Revision History  

• Version 1.0: 2003-12-09
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Source and taxonomy, Version format compliance
• Version 1.3: 2023-08-23
  Changes: Data collection, Database references, Refinement description