1.9A Crystal Structure of the protein isdG from Staphylococcus aureus aureus, Structural genomics, MCSG

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.230 

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This is version 1.3 of the entry. See complete history


Staphylococcus aureus IsdG and IsdI, heme-degrading enzymes with structural similarity to monooxygenases.

Wu, R.Skaar, E.P.Zhang, R.Joachimiak, G.Gornicki, P.Schneewind, O.Joachimiak, A.

(2005) J Biol Chem 280: 2840-2846

  • DOI: https://doi.org/10.1074/jbc.M409526200
  • Primary Citation of Related Structures:  
    1SQE, 1XBW

  • PubMed Abstract: 

    Heme-degrading enzymes are involved in human diseases ranging from stroke, cancer, and multiple sclerosis to infectious diseases such as malaria, diphtheria, and meningitis. All mammalian and microbial enzymes identified to date are members of the heme oxygenase superfamily and assume similar monomeric structures with an all alpha-helical fold. Here we describe the crystal structures of IsdG and IsdI, two heme-degrading enzymes from Staphylococcus aureus. The structures of both enzymes resemble the ferredoxin-like fold and form a beta-barrel at the dimer interface. Two large pockets found on the outside of the barrel contain the putative active sites. Sequence homologs of IsdG and IsdI were identified in multiple Gram-positive pathogens. Substitution of conserved IsdG amino acid residues either reduced or abolished heme degradation, suggesting a common catalytic mechanism. This mechanism of IsdG-mediated heme degradation may be similar to that of the structurally related monooxygenases, enzymes involved in the synthesis of antibiotics in Streptomyces. Our results imply the evolutionary adaptation of microbial enzymes to unique environments.

  • Organizational Affiliation

    Structural Biology Center and Midwest Center for Structural Genomics, Biosciences Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
hypothetical protein isdG
A, B, C, D
109Staphylococcus aureus subsp. aureus MW2Mutation(s): 0 
Gene Names: GI:1003130
Find proteins for Q8NX62 (Staphylococcus aureus (strain MW2))
Explore Q8NX62 
Go to UniProtKB:  Q8NX62
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8NX62
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.230 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.742α = 90
b = 66.779β = 105.18
c = 67.678γ = 90
Software Package:
Software NamePurpose
SBC-Collectdata collection
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-10-12
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references