3M9K

Crystal structure of human thioredoxin C69/73S double-mutant, oxidized form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Crystal structure of human thioredoxin revealing an unraveled helix and exposed S-nitrosation site.

Weichsel, A.Kem, M.Montfort, W.R.

(2010) Protein Sci 19: 1801-1806

  • DOI: 10.1002/pro.455
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Thioredoxins reduce disulfide bonds and other thiol modifications in all cells using a CXXC motif. Human thioredoxin 1 is unusual in that it codes for an additional three cysteines in its 105 amino acid sequence, each of which have been implicated in ...

    Thioredoxins reduce disulfide bonds and other thiol modifications in all cells using a CXXC motif. Human thioredoxin 1 is unusual in that it codes for an additional three cysteines in its 105 amino acid sequence, each of which have been implicated in other reductive activities. Cys 62 and Cys 69 are buried in the protein interior and lie at either end of a short helix (helix 3), and yet can disulfide link under oxidizing conditions. Cys 62 is readily S-nitrosated, giving rise to a SNO modification, which is also buried. Here, we present two crystal structures of the C69S/C73S mutant protein under oxidizing (1.5 A) and reducing (1.1 A) conditions. In the oxidized structure, helix 3 is unraveled and displays a new conformation that is stabilized by a series of new hydrogen bonds and a disulfide link with Cys 62 in a neighboring molecule. The new conformation provides an explanation for how a completely buried residue can participate in SNO exchange reactions.


    Related Citations: 
    • Buried S-nitrosocysteine revealed in crystal structures of human thioredoxin.
      Weichsel, A., Brailey, J.L., Montfort, W.R.
      (2007) Biochemistry 46: 1219
    • Crystal structures of reduced, oxidized, and mutated human thioredoxins: evidence for a regulatory homodimer.
      Weichsel, A., Gasdaska, J.R., Powis, G., Montfort, W.R.
      (1996) Structure 4: 735

    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thioredoxin
A, B
105Homo sapiensMutation(s): 2 
Gene Names: TXNTRDXTRXTRX1
Find proteins for P10599 (Homo sapiens)
Go to UniProtKB:  P10599
NIH Common Fund Data Resources
PHAROS  P10599
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
D1D
Query on D1D

Download CCD File 
B
(4S,5S)-1,2-DITHIANE-4,5-DIOL
C4 H8 O2 S2
YPGMOWHXEQDBBV-QWWZWVQMSA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.185 
  • Space Group: P 6
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 125.62α = 90
b = 125.62β = 90
c = 33.55γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
Blu-Icedata collection
CrystalCleardata reduction
d*TREKdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-08-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance