3M9J

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.10 Å
  • R-Value Free: 0.172 
  • R-Value Work: 0.144 
  • R-Value Observed: 0.145 

wwPDB Validation   3D Report Full Report


This is version 1.4 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: https://doi.org/10.1002/pro.455
  • Primary Citation of Related Structures:  
    3M9J, 3M9K

  • 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 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.


  • Organizational Affiliation

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


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Thioredoxin
A, B
105Homo sapiensMutation(s): 2 
Gene Names: TXNTRDXTRXTRX1
UniProt & NIH Common Fund Data Resources
Find proteins for P10599 (Homo sapiens)
Explore P10599 
Go to UniProtKB:  P10599
PHAROS:  P10599
GTEx:  ENSG00000136810 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP10599
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.10 Å
  • R-Value Free: 0.172 
  • R-Value Work: 0.144 
  • R-Value Observed: 0.145 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.233α = 90
b = 46.207β = 93.25
c = 52.33γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing
REFMACrefinement
PDB_EXTRACTdata extraction
XDSdata scaling
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-08-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-08
    Changes: Refinement description
  • Version 1.3: 2021-10-06
    Changes: Database references
  • Version 1.4: 2023-09-06
    Changes: Data collection, Refinement description