Crystal Structure of S. aureus FabH, beta-ketoacyl carrier protein synthase III

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.211 

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Crystal structure and substrate specificity of the beta-ketoacyl-acyl carrier protein synthase III (FabH) from Staphylococcus aureus.

Qiu, X.Choudhry, A.E.Janson, C.A.Grooms, M.Daines, R.A.Lonsdale, J.T.Khandekar, S.S.

(2005) Protein Sci 14: 2087-2094

  • DOI: https://doi.org/10.1110/ps.051501605
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    beta-Ketoacyl-ACP synthase III (FabH), an essential enzyme for bacterial viability, catalyzes the initiation of fatty acid elongation by condensing malonyl-ACP with acetyl-CoA. We have determined the crystal structure of FabH from Staphylococcus aureus, a Gram-positive human pathogen, to 2 A resolution. Although the overall structure of S. aureus FabH is similar to that of Escherichia coli FabH, the primer binding pocket in S. aureus FabH is significantly larger than that present in E. coli FabH. The structural differences, which agree with kinetic parameters, provide explanation for the observed varying substrate specificity for E. coli and S. aureus FabH. The rank order of activity of S. aureus FabH with various acyl-CoA primers was as follows: isobutyryl- > hexanoyl- > butyryl- > isovaleryl- >> acetyl-CoA. The availability of crystal structure may aid in designing potent, selective inhibitors of S. aureus FabH.

  • Organizational Affiliation

    GlaxoSmithKline, King of Prussia, Pennsylvania 19406, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
3-oxoacyl-[acyl-carrier-protein] synthase III
A, B, C, D
313Staphylococcus aureus subsp. aureus MW2Mutation(s): 0 
Find proteins for Q8NXE2 (Staphylococcus aureus (strain MW2))
Explore Q8NXE2 
Go to UniProtKB:  Q8NXE2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8NXE2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.211 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.9α = 90
b = 93.6β = 93.9
c = 110γ = 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: 2005-08-09
    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: 2023-08-23
    Changes: Data collection, Database references, Refinement description