4BIG

Crystal structure of the conserved staphylococcal antigen 1B, Csa1B


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.27 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.215 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Mining the Bacterial Unknown Proteome: Identification and Characterization of a Novel Family of Highly Conserved Protective Antigens in Staphylococcus Aureus

Schluepen, C.Malito, E.Marongiu, A.Schirle, M.Mcwhinnie, E.Lo Surdo, P.Biancucci, M.Falugi, F.Nardi-Dei, V.Marchi, S.Fontana, M.R.Lombardi, B.De Falco, M.G.Rinaudo, C.D.Spraggon, G.Nissum, M.Bagnoli, F.Grandi, G.Bottomley, M.J.Liberatori, S.

(2013) Biochem J 455: 273

  • DOI: 10.1042/BJ20130540
  • Primary Citation of Related Structures:  
    4BIG, 4BIH

  • PubMed Abstract: 
  • In the human pathogen Staphylococcus aureus, there exists an enormous diversity of proteins containing DUFs (domains of unknown function). In the present study, we characterized the family of conserved staphylococcal antigens (Csa) classified as DUF576 and taxonomically restricted to Staphylococci ...

    In the human pathogen Staphylococcus aureus, there exists an enormous diversity of proteins containing DUFs (domains of unknown function). In the present study, we characterized the family of conserved staphylococcal antigens (Csa) classified as DUF576 and taxonomically restricted to Staphylococci. The 18 Csa paralogues in S. aureus Newman are highly similar at the sequence level, yet were found to be expressed in multiple cellular locations. Extracellular Csa1A was shown to be post-translationally processed and released. Molecular interaction studies revealed that Csa1A interacts with other Csa paralogues, suggesting that these proteins are involved in the same cellular process. The structures of Csa1A and Csa1B were determined by X-ray crystallography, unveiling a peculiar structure with limited structural similarity to other known proteins. Our results provide the first detailed biological characterization of this family and confirm the uniqueness of this family also at the structural level. We also provide evidence that Csa family members elicit protective immunity in in vivo animal models of staphylococcal infections, indicating a possible important role for these proteins in S. aureus biology and pathogenesis. These findings identify the Csa family as new potential vaccine candidates, and underline the importance of mining the bacterial unknown proteome to identify new targets for preventive vaccines.


    Organizational Affiliation

    *Research Department, Novartis Vaccines and Diagnostics, 53100 Siena, Italy.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
UNCHARACTERIZED LIPOPROTEIN SAOUHSC_00053 A247Staphylococcus aureus subsp. aureus NCTC 8325Mutation(s): 0 
Gene Names: SAOUHSC_00053
Find proteins for Q2G1Q0 (Staphylococcus aureus (strain NCTC 8325 / PS 47))
Explore Q2G1Q0 
Go to UniProtKB:  Q2G1Q0
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
AL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.27 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.215 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.15α = 90
b = 73.42β = 90
c = 46.67γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-08-07
    Type: Initial release
  • Version 1.1: 2013-10-30
    Changes: Database references