Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 141.96 kDa 
• Atom Count: 9621 
• Modelled Residue Count: 1196 
• Deposited Residue Count: 1270 
• Unique protein chains: 2

3QFB

Crystal structure of the human thioredoxin reductase-thioredoxin complex

• PDB DOI: 10.2210/pdb3QFB/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2011-01-21 Released: 2011-07-27 
• Deposition Author(s): Fritz-Wolf, K., Kehr, S., Stumpf, M., Rahlfs, S., Becker, K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.297 
• R-Value Work: 0.235 
• R-Value Observed: 0.235 

Literature

Crystal structure of the human thioredoxin reductase-thioredoxin complex

Fritz-Wolf, K., Kehr, S., Stumpf, M., Rahlfs, S., Becker, K.

(2011) Nat Commun 2: 383-383

• PubMed: 21750537 
• DOI: 10.1038/ncomms1382
• Primary Citation of Related Structures:  
  3QFA, 3QFB


• PubMed Abstract: 
  

Thioredoxin reductase 1 (TrxR1) is a homodimeric flavoprotein crucially involved in the regulation of cellular redox homeostasis, growth, and differentiation. Its importance in various diseases makes TrxR1 a highly interesting drug target. Here we present the first crystal structures of human TrxR1 in complex with its substrate thioredoxin (Trx). The carboxy-terminal redox centre is found about 20 Å apart from the amino-terminal redox centre, with no major conformational changes in TrxR or Trx. Thus, our structure confirms that the enzyme uses a flexible C-terminal arm for electron transport to its substrates, which is stabilized by a guiding bar for controlled transfer. This notion is supported by mutational analyses. Furthermore, essential residues of the interface region were characterized both structurally and functionally. The structure provides templates for future drug design, and contributes to our understanding of redox regulatory processes in mammals.

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Organizational Affiliation: 

Interdisciplinary Research Centre, Justus Liebig University, D-35392 Giessen, Germany.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Thioredoxin reductase 1, cytoplasmic	A, B	519	Homo sapiens	Mutation(s): 1  Gene Names: GRIM12, KDRF, TXNRD1 EC: 1.8.1.9
UniProt & NIH Common Fund Data Resources
Find proteins for Q16881 (Homo sapiens) Explore Q16881  Go to UniProtKB:  Q16881
PHAROS:  Q16881 GTEx:  ENSG00000198431

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Thioredoxin	C, D	116	Homo sapiens	Mutation(s): 2  Gene Names: TRDX, TRX, TRX1, TXN
UniProt & NIH Common Fund Data Resources
Find proteins for P10599 (Homo sapiens) Explore P10599  Go to UniProtKB:  P10599
PHAROS:  P10599 GTEx:  ENSG00000136810

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
FAD	E [auth A], J [auth B]	FLAVIN-ADENINE DINUCLEOTIDE C27 H33 N9 O15 P2 VWWQXMAJTJZDQX-UYBVJOGSSA-N
GOL	F [auth A], G [auth A], H [auth A], I [auth A], K [auth B], L [auth B]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.297 
• R-Value Work: 0.235 
• R-Value Observed: 0.235 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 71.27	α = 90
b = 121.7	β = 95.33
c = 73.89	γ = 90

Software Package:

Software Name	Purpose
MOSFLM	data reduction
CNS	refinement
XDS	data reduction
XDS	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-01-21 
• Released Date: 2011-07-27 
Deposition Author(s): Fritz-Wolf, K., Kehr, S., Stumpf, M., Rahlfs, S., Becker, K.

Revision History  

• Version 1.0: 2011-07-27
  Type: Initial release