Crystal structure of the C-terminal methionine sulfoxide reductase domain (MsrB) of N. gonorrhoeae pilB

Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.207 

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The mirrored methionine sulfoxide reductases of Neisseria gonorrhoeae pilB.

Lowther, W.T.Weissbach, H.Etienne, F.Brot, N.Matthews, B.W.

(2002) Nat Struct Biol 9: 348-352

  • DOI: https://doi.org/10.1038/nsb783
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Methionine sulfoxide reductases (Msr) protect against oxidative damage that can contribute to cell death. The tandem Msr domains (MsrA and MsrB) of the pilB protein from Neisseria gonorrhoeae each reduce different epimeric forms of methionine sulfoxide. The overall fold of the MsrB domain revealed by the 1.85 A crystal structure shows no resemblance to the previously determined MsrA structures from other organisms. Despite the lack of homology, the active sites show approximate mirror symmetry. In each case, conserved amino acid motifs mediate the stereo-specific recognition and reduction of the substrate. Unlike the MsrA domain, the MsrB domain activates the cysteine or selenocysteine nucleophile through a unique Cys-Arg-Asp/Glu catalytic triad. The collapse of the reaction intermediate most likely results in the formation of a sulfenic or selenenic acid moiety. Regeneration of the active site occurs through a series of thiol-disulfide exchange steps involving another active site Cys residue and thioredoxin. These observations have broad implications for modular catalysis, antibiotic drug design and continuing longevity studies in mammals.

  • Organizational Affiliation

    Institute of Molecular Biology, Howard Hughes Medical Institute and Department of Physics, 1229 University of Oregon, Eugene, Oregon 97403-1229, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
peptide methionine sulfoxide reductase
A, B
152Neisseria gonorrhoeaeMutation(s): 0 
Gene Names: pilB
EC: (PDB Primary Data), (PDB Primary Data)
Find proteins for P14930 (Neisseria gonorrhoeae)
Explore P14930 
Go to UniProtKB:  P14930
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP14930
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 1.85 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.207 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.354α = 90
b = 68.078β = 90
c = 62.777γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-05-01
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance