3E3E

Human Thioredoxin Double Mutant C35S,C73R


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.01 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.209 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of human thioredoxin exhibits a large conformational change.

Hall, G.Emsley, J.

(2010) Protein Sci. 19: 1807-1811

  • DOI: 10.1002/pro.466

  • PubMed Abstract: 
  • Thioredoxin is an oxidoreductase, which is ubiquitously present across phyla from humans to plants and bacteria. Thioredoxin reduces a variety of substrates through active site Cys 32, which is subsequently oxidized to form the intramolecular disulph ...

    Thioredoxin is an oxidoreductase, which is ubiquitously present across phyla from humans to plants and bacteria. Thioredoxin reduces a variety of substrates through active site Cys 32, which is subsequently oxidized to form the intramolecular disulphide with Cys 35. The thioredoxin fold is known to be highly stable and conformational changes in the active site loops and residues Cys 32, Cys 35 have been characterized between ligand bound and free structures. We have determined a novel 2.0 A resolution crystal structure for a human thioredoxin, which reveals a much larger conformational change than previously characterized. The principal change involves unraveling of a helix to form an extended loop that is linked to secondary changes in further loop regions and the wider area of the active site Cys 32. This gives rise to a more open conformation and an elongated hydrophobic pocket results in place of the helix. Buried residue Cys 62 from this helix becomes exposed in the open conformation. This provides a structural basis for observations that the Cys 62 sidechain can form mixed disulphides and be modified by thiol reactive small molecules.


    Organizational Affiliation

    Centre for Biomolecular Sciences, School of Pharmacy, University of Nottingham, Nottingham, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thioredoxin
A, B
105Homo sapiensMutation(s): 2 
Gene Names: TXN (TRDX, TRX, TRX1)
Find proteins for P10599 (Homo sapiens)
Go to Gene View: TXN
Go to UniProtKB:  P10599
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
P6G
Query on P6G

Download SDF File 
Download CCD File 
A, B
HEXAETHYLENE GLYCOL
POLYETHYLENE GLYCOL PEG400
C12 H26 O7
IIRDTKBZINWQAW-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.01 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.209 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 62.050α = 90.00
b = 62.050β = 90.00
c = 90.610γ = 120.00
Software Package:
Software NamePurpose
d*TREKdata scaling
PHASESphasing
d*TREKdata reduction
CrystalCleardata collection
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2008-08-07 
  • Released Date: 2010-03-02 
  • Deposition Author(s): Hall, G., Emsley, J.

Revision History 

  • Version 1.0: 2010-03-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance