S123C mutant of the iron-superoxide dismutase from Mycobacterium tuberculosis.

Experimental Data Snapshot

  • Resolution: 3.40 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.249 

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This is version 1.3 of the entry. See complete history


Engineering of an Intersubunit Disulfide Bridge in the Iron-Superoxide Dismutase of Mycobacterium Tuberculosis.

Bunting, K.A.Cooper, J.B.Tickle, I.J.Young, D.B.

(2002) Arch Biochem Biophys 397: 69

  • DOI: https://doi.org/10.1006/abbi.2001.2635
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    With the aim of enhancing interactions involved in dimer formation, an intersubunit disulfide bridge was engineered in the superoxide dismutase enzyme of Mycobacterium tuberculosis. Ser-123 was chosen for mutation to cysteine since it resides at the dimer interface where the serine side chain interacts with the same residue in the opposite subunit. Gel electrophoresis and X-ray crystallographic studies of the expressed mutant confirmed formation of the disulfide bond under nonreducing conditions. However, the mutant protein was found to be less stable than the wild type as judged by susceptibility to denaturation in the presence of guanidine hydrochloride. Decreased stability probably results from formation of a disulfide bridge with a suboptimal torsion angle and exclusion of solvent molecules from the dimer interface.

  • Organizational Affiliation

    Department of Crystallography, Birkbeck College, Malet Street, London WC1E 7HX, United Kingdom. kbunting@icr.ac.uk

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D, E
A, B, C, D, E, F, G, H
207Mycobacterium tuberculosisMutation(s): 0 
Find proteins for P9WGE7 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WGE7 
Go to UniProtKB:  P9WGE7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WGE7
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.40 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.249 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 103.08α = 90
b = 106.33β = 92.37
c = 76.1γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-10-05
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description