Structure of PstA

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.248 

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Complex Structure and Biochemical Characterization of the Staphylococcus Aureus Cyclic Di-AMP Binding Protein Psta, the Founding Member of a New Signal Transduction Protein Family

Campeotto, I.Zhang, Y.Mladenov, M.G.Freemont, P.S.Grundling, A.

(2015) J Biol Chem 290: 2888

  • DOI: https://doi.org/10.1074/jbc.M114.621789
  • Primary Citation of Related Structures:  
    4D3G, 4D3H

  • PubMed Abstract: 

    Signaling nucleotides are integral parts of signal transduction systems allowing bacteria to cope with and rapidly respond to changes in the environment. The Staphylococcus aureus PII-like signal transduction protein PstA was recently identified as a cyclic diadenylate monophosphate (c-di-AMP)-binding protein. Here, we present the crystal structures of the apo- and c-di-AMP-bound PstA protein, which is trimeric in solution as well as in the crystals. The structures combined with detailed bioinformatics analysis revealed that the protein belongs to a new family of proteins with a similar core fold but with distinct features to classical PII proteins, which usually function in nitrogen metabolism pathways in bacteria. The complex structure revealed three identical c-di-AMP-binding sites per trimer with each binding site at a monomer-monomer interface. Although distinctly different from other cyclic-di-nucleotide-binding sites, as the half-binding sites are not symmetrical, the complex structure also highlighted common features for c-di-AMP-binding sites. A comparison between the apo and complex structures revealed a series of conformational changes that result in the ordering of two anti-parallel β-strands that protrude from each monomer and allowed us to propose a mechanism on how the PstA protein functions as a signaling transduction protein.

  • Organizational Affiliation

    Section of Structural Biology, Department of Medicine, Imperial College London, London SW7 2AZ, United Kingdom p.freemont@imperial.ac.uk.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PSTA128Staphylococcus aureusMutation(s): 0 
Find proteins for Q2G229 (Staphylococcus aureus (strain NCTC 8325 / PS 47))
Explore Q2G229 
Go to UniProtKB:  Q2G229
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ2G229
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.248 
  • Space Group: P 3 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.753α = 90
b = 56.753β = 90
c = 66.165γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-12-24
    Type: Initial release
  • Version 1.1: 2014-12-31
    Changes: Database references
  • Version 1.2: 2015-02-11
    Changes: Database references