Crystal Structure of Sara, A Transcription Regulator From Staphylococcus Aureus

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.302 
  • R-Value Work: 0.266 
  • R-Value Observed: 0.266 

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Structural and function analyses of the global regulatory protein SarA from Staphylococcus aureus.

Liu, Y.Manna, A.C.Pan, C.H.Kriksunov, I.A.Thiel, D.J.Cheung, A.L.Zhang, G.

(2006) Proc Natl Acad Sci U S A 103: 2392-2397

  • DOI: https://doi.org/10.1073/pnas.0510439103
  • Primary Citation of Related Structures:  
    2FNP, 2FRH

  • PubMed Abstract: 

    The sarA locus in Staphylococcus aureus controls the expression of many virulence genes. The sarA regulatory molecule, SarA, is a 14.7-kDa protein (124 residues) that binds to the promoter region of target genes. Here we report the 2.6 A-resolution x-ray crystal structure of the dimeric winged helix SarA protein, which differs from the published SarA structure dramatically. In the crystal packing, multiple dimers of SarA form a scaffold, possibly via divalent cations. Mutations of individual residues within the DNA-binding helix-turn-helix and the winged region as well as within the metal-binding pocket implicate basic residues R84 and R90 within the winged region to be critical in DNA binding, whereas acidic residues D88 and E89 (wing), D8 and E11 (metal-binding pocket), and cysteine 9 are essential for SarA function. These data suggest that the winged region of the winged helix protein participates in DNA binding and activation, whereas the putative divalent cation binding pocket is only involved in gene function.

  • Organizational Affiliation

    Integrated Department of Immunology, National Jewish Medical and Research Center, Biomolecular Structure Program and Department of Pharmacology, School of Medicine, University of Colorado Health Science Center, Denver, CO 80206, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Staphylococcal accessory regulator A
A, B
127Staphylococcus aureusMutation(s): 0 
Gene Names: sarA
Find proteins for Q7A1N5 (Staphylococcus aureus (strain MW2))
Explore Q7A1N5 
Go to UniProtKB:  Q7A1N5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7A1N5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.302 
  • R-Value Work: 0.266 
  • R-Value Observed: 0.266 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.338α = 90
b = 65.338β = 90
c = 237.289γ = 120
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: 2006-01-31
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Derived calculations