1W89

Structure of the reduced form of human thioredoxin 2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal Structures of Oxidized and Reduced Forms of Human Mitochondrial Thioredoxin 2.

Smeets, A.Evrard, C.Landtmeters, M.Marchand, C.Knoops, B.Declercq, J.P.

(2005) Protein Sci. 14: 2610

  • DOI: 10.1110/ps.051632905
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Mammalian thioredoxin 2 is a mitochondrial isoform of highly evolutionary conserved thioredoxins. Thioredoxins are small ubiquitous protein-disulfide oxidoreductases implicated in a large variety of biological functions. In mammals, thioredoxin 2 is ...

    Mammalian thioredoxin 2 is a mitochondrial isoform of highly evolutionary conserved thioredoxins. Thioredoxins are small ubiquitous protein-disulfide oxidoreductases implicated in a large variety of biological functions. In mammals, thioredoxin 2 is encoded by a nuclear gene and is targeted to mitochondria by a N-terminal mitochondrial presequence. Recently, mitochondrial thioredoxin 2 was shown to interact with components of the mitochondrial respiratory chain and to play a role in the control of mitochondrial membrane potential, regulating mitochondrial apoptosis signaling pathway. Here we report the first crystal structures of a mammalian mitochondrial thioredoxin 2. Crystal forms of reduced and oxidized human thioredoxin 2 are described at 2.0 and 1.8 A resolution. Though the folding is rather similar to that of human cytosolic/nuclear thioredoxin 1, important differences are observed during the transition between the oxidized and the reduced states of human thioredoxin 2, compared with human thioredoxin 1. In spite of the absence of the Cys residue implicated in dimer formation in human thioredoxin 1, dimerization still occurs in the crystal structure of human thioredoxin 2, mainly mediated by hydrophobic contacts, and the dimers are associated to form two-dimensional polymers. Interestingly, the structure of human thioredoxin 2 reveals possible interaction domains with human peroxiredoxin 5, a substrate protein of human thioredoxin 2 in mitochondria.


    Related Citations: 
    • Human Mitochondrial Thioredoxin
      Damdimopoulos, A.E.,Miranda-Vizuete, A.,Pelto-Huikkos, M.,Gustafsson, J.A.,Spyrou, G.
      (2002) J.Biol.Chem. 277: 33249


    Organizational Affiliation

    Unit of Structural Chemistry (CSTR), Université catholique de Louvain, 1 place Louis Pasteur, B-1348 Louvain-la-Neuve, Belgium.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
THIOREDOXIN
A, B, C, D, E, F
119Homo sapiensMutation(s): 0 
Gene Names: TXN2 (TRX2)
Find proteins for Q99757 (Homo sapiens)
Go to Gene View: TXN2
Go to UniProtKB:  Q99757
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.217 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 49.580α = 87.77
b = 49.610β = 82.30
c = 80.020γ = 79.31
Software Package:
Software NamePurpose
XDSdata reduction
REFMACrefinement
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-10-05
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Refinement description, Version format compliance