4XYQ

Structure of AgrA LytTR domain in complex with promoters


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.203 

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Literature

Conformational features of theStaphylococcus aureusAgrA-promoter interactions rationalize quorum-sensing triggered gene expression.

Rajasree, K.Fasim, A.Gopal, B.

(2016) Biochem Biophys Rep 6: 124-134

  • DOI: 10.1016/j.bbrep.2016.03.012
  • Primary Citation of Related Structures:  
    4XQJ, 4XQN, 4XQQ, 4XXE, 4XYO, 4XYQ

  • PubMed Abstract: 
  • The intracellular trigger for the quorum sensing response mechanism in Staphylococcus aureus involves the phosphorylation of the response regulator AgrA by the membrane anchored histidine kinase AgrC. AgrA activates transcription from three promoter sequences (P1-P3) ...

    The intracellular trigger for the quorum sensing response mechanism in Staphylococcus aureus involves the phosphorylation of the response regulator AgrA by the membrane anchored histidine kinase AgrC. AgrA activates transcription from three promoter sequences (P1-P3). The promoter strength, conditional association of AgrA with these promoter elements and temporal delay in AgrA-mediated changes in gene expression contribute to the diversity of the quorum sensing response in different S. aureus strains. AgrA promoters comprise of imperfect direct repeats of DNA with a consensus sequence- [TA][AC][CA]GTTN[AG][TG]. Here we describe crystal structures of the DNA-binding (LytTR) domain of AgrA with different cognate DNA sequences that reveal a hitherto unanticipated feature of AgrA-DNA interactions. AgrA promoter interactions are asymmetric with fewer interactions at the binding site proximal to the -35 promoter element. Biochemical assays to evaluate AgrA-promoter interactions suggests that phosphorylation induced dimerization of AgrA can compensate for the asymmetry in AgrA-DNA interactions. The structures also provide a basis to rationalize mutations that were noted to alter AgrA activity without affecting protein-DNA interactions. Put together, the structural data, gene expression and mutational analysis reveal that promoter strength and AgrA phosphorylation enable quorum-sensing triggered transcriptional changes leading to a transition from the persistent to virulent phenotype.


    Organizational Affiliation

    Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560012, India.



Macromolecules

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Accessory gene regulator AC [auth A]103Staphylococcus aureus subsp. aureus COLMutation(s): 0 
Gene Names: agrASACOL2026
UniProt
Find proteins for Q5HEG2 (Staphylococcus aureus (strain COL))
Explore Q5HEG2 
Go to UniProtKB:  Q5HEG2
Protein Feature View
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  • Reference Sequence
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  • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(*TP*TP*TP*AP*AP*CP*AP*GP*TP*TP*AP*AP*GP*TP*AP*T)-3')A [auth B]16synthetic construct
    Protein Feature View
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    • Reference Sequence
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    • Entity ID: 2
      MoleculeChainsLengthOrganismImage
      DNA (5'-D(*AP*AP*TP*AP*CP*TP*TP*AP*AP*CP*TP*GP*TP*TP*AP*A)-3')B [auth C]16synthetic construct
      Protein Feature View
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      • Reference Sequence
      Small Molecules
      Ligands 1 Unique
      IDChainsName / Formula / InChI Key2D Diagram3D Interactions
      EDO
      Query on EDO

      Download Ideal Coordinates CCD File 
      D [auth A]1,2-ETHANEDIOL
      C2 H6 O2
      LYCAIKOWRPUZTN-UHFFFAOYSA-N
       Ligand Interaction
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.40 Å
      • R-Value Free: 0.238 
      • R-Value Work: 0.201 
      • R-Value Observed: 0.203 
      • Space Group: P 41
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 47.77α = 90
      b = 47.77β = 90
      c = 100.25γ = 90
      Software Package:
      Software NamePurpose
      REFMACrefinement
      SCALAdata reduction
      SCALAdata scaling
      PHASERphasing

      Structure Validation

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      Entry History 

      Deposition Data

      Revision History  (Full details and data files)

      • Version 1.0: 2016-04-06
        Type: Initial release
      • Version 1.1: 2019-12-18
        Changes: Database references, Derived calculations