Crystal structure of E. coli thioredoxin mutant I76T in its oxidized form

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.254 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Properties of the thioredoxin fold superfamily are modulated by a single amino acid residue.

Ren, G.Stephan, D.Xu, Z.Zheng, Y.Tang, D.Harrison, R.S.Kurz, M.Jarrott, R.Shouldice, S.R.Hiniker, A.Martin, J.L.Heras, B.Bardwell, J.C.

(2009) J Biol Chem 284: 10150-10159

  • DOI: https://doi.org/10.1074/jbc.M809509200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The ubiquitous thioredoxin fold proteins catalyze oxidation, reduction, or disulfide exchange reactions depending on their redox properties. They also play vital roles in protein folding, redox control, and disease. Here, we have shown that a single residue strongly modifies both the redox properties of thioredoxin fold proteins and their ability to interact with substrates. This residue is adjacent in three-dimensional space to the characteristic CXXC active site motif of thioredoxin fold proteins but distant in sequence. This residue is just N-terminal to the conservative cis-proline. It is isoleucine 75 in the case of thioredoxin. Our findings support the conclusion that a very small percentage of the amino acid residues of thioredoxin-related proteins are capable of dictating the functions of these proteins.

  • Organizational Affiliation

    Howard Hughes Medical Institute, Departments of Molecular, Cellular, and Developmental Biology and Biological Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
111Escherichia coli K-12Mutation(s): 1 
Gene Names: trxAfipAtsnCb3781JW5856
Find proteins for P0AA25 (Escherichia coli (strain K12))
Explore P0AA25 
Go to UniProtKB:  P0AA25
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AA25
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.254 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.79α = 90
b = 39.39β = 96.63
c = 90.55γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-01-27
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Advisory, Refinement description
  • Version 1.3: 2019-07-24
    Changes: Data collection, Refinement description
  • Version 1.4: 2021-10-20
    Changes: Advisory, Database references