1GN2

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.4 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.249 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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: 10.1006/abbi.2001.2635

  • 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 ...

    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.


    Related Citations: 
    • Engineering a Change in Metal-Ion Specificity of the Iron-Dependent Superoxide Dismutase from Mycobacterium Tuberculosis-- X-Ray Structure Analysis of Site-Directed Mutants
      Bunting, K.,Cooper, J.B.,Badasso, M.O.,Tickle, I.J.,Newton, M.,Wood, S.P.,Zhang, Y.,Young, D.
      (1998) Eur.J.Biochem. 251: 795


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SUPEROXIDE DISMUTASE
A, B, C, D, E, F, G, H
207Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Gene Names: sodB (sod, sodA)
EC: 1.15.1.1
Find proteins for P9WGE7 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WGE7
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FE
Query on FE

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.4 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.249 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 103.080α = 90.00
b = 106.330β = 92.37
c = 76.100γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
MOSFLMdata reduction
CCP4refinement
CCP4phasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-10-05
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance