2IIY

Crystal structure of S-nitroso thioredoxin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.210 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Buried s-nitrosocysteine revealed in crystal structures of human thioredoxin.

Weichsel, A.Brailey, J.L.Montfort, W.R.

(2007) Biochemistry 46: 1219-1227

  • DOI: 10.1021/bi061878r
  • Primary Citation of Related Structures:  
    2HSH, 2HXK, 2IFQ, 2IIY

  • PubMed Abstract: 
  • We have determined the 1.65 A crystal structure of human thioredoxin-1 after treatment with S-nitrosoglutathione, providing a high-resolution view of this important protein modification and mechanistic insight into protein transnitrosation. Thioredox ...

    We have determined the 1.65 A crystal structure of human thioredoxin-1 after treatment with S-nitrosoglutathione, providing a high-resolution view of this important protein modification and mechanistic insight into protein transnitrosation. Thioredoxin-1 appears to play an intermediary role in cellular S-nitrosylation and is important in numerous biological and pathobiological activities. S-Nitroso modifications of cysteines 62 and 69 are clearly visible in the structure and display planar cis geometries, whereas cysteines 32, 35, and 73 form intra- and intermolecular disulfide bonds. Surprisingly, the Cys 62 nitroso group is completely buried and pointing to the protein interior yet is the most readily formed at neutral pH. The Cys 69 nitroso group is also protected but requires a higher pH for stable formation. The helix intervening between residues 62 and 69 shifts by approximately 0.5 A to accommodate the SNO groups. The crystallographic asymmetric unit contains three independent molecules of thioredoxin, providing three views of the nitrosated protein. The three molecules are in general agreement but display subtle differences, including both cis and trans conformers for Cys 69 SNO in molecule C, and greater disorder in the Cys 62-Cys 69 helix in molecule B. Possible mechanisms for protein transnitrosation with specific geometric requirements and charge stabilization of the nitroxyl disulfide reaction intermediate are discussed.


    Related Citations: 
    • Crystal structures of reduced, oxidized, and mutated human thioredoxin: evidence for a regulatory homodimer
      Weichsel, A., Gasdaska, J.R., Powis, G., Montfort, W.R.
      (1996) Structure 4: 735

    Organizational Affiliation

    Department of Biochemistry and Molecular Biophysics, University of Arizona, Tucson, Arizona 85721, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ThioredoxinA105Homo sapiensMutation(s): 2 
Gene Names: TXNTRDXTRXTRX1
Find proteins for P10599 (Homo sapiens)
Explore P10599 
Go to UniProtKB:  P10599
NIH Common Fund Data Resources
PHAROS  P10599
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SNC
Query on SNC
AL-PEPTIDE LINKINGC3 H6 N2 O3 SCYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.210 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.86α = 90
b = 26.24β = 95.02
c = 51.3γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
CrystalCleardata collection
CrystalCleardata reduction
CrystalCleardata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-12-05
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance