4ANN

Crystal Structure Staphylococcus aureus ESSB cytoplasmic fragment


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.05 Å
  • R-Value Free: 0.181 

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This is version 1.3 of the entry. See complete history


Literature

Characterization of Staphylococcus Aureus Essb, an Integral Membrane Component of the Type Vii Secretion System: Atomic Resolution Crystal Structure of the Cytoplasmic Segment.

Zoltner, M.Fyfe, P.K.Palmer, T.Hunter, W.N.

(2013) Biochem J 449: 469

  • DOI: 10.1042/BJ20121209
  • Primary Citation of Related Structures:  
    4ANN

  • PubMed Abstract: 
  • The Type VII protein translocation/secretion system, unique to Gram-positive bacteria, is a key virulence determinant in Staphylococcus aureus. We aim to characterize the architecture of this secretion machinery and now describe the present study of ...

    The Type VII protein translocation/secretion system, unique to Gram-positive bacteria, is a key virulence determinant in Staphylococcus aureus. We aim to characterize the architecture of this secretion machinery and now describe the present study of S. aureus EssB, a 52 kDa bitopic membrane protein essential for secretion of the ESAT-6 (early secretory antigenic target of 6 kDa) family of proteins, the prototypic substrate of Type VII secretion. Full-length EssB was heterologously expressed in Escherichia coli, solubilized from the bacterial membrane, purified to homogeneity and shown to be dimeric. A C-terminal truncation, EssB∆C, and two soluble fragments termed EssB-N and EssB-C, predicted to occur on either side of the cytoplasmic membrane, have been successfully purified in a recombinant form, characterized and, together with the full-length protein, used in crystallization trials. EssB-N, the 25 kDa N-terminal cytoplasmic fragment, gave well-ordered crystals and we report the structure, determined by SAD (single-wavelength anomalous diffraction) targeting an SeMet (selenomethionine) derivative, refined to atomic (1.05 Å; 1 Å=0.1 nm) resolution. EssB-N is dimeric in solution, but crystallizes as a monomer and displays a fold comprised of two globular domains separated by a cleft. The structure is related to that of serine/threonine protein kinases and the present study identifies that the Type VII secretion system exploits and re-uses a stable modular entity and fold that has evolved to participate in protein-protein interactions in a similar fashion to the catalytically inert pseudokinases.


    Organizational Affiliation

    College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ESSBA215Staphylococcus aureus subsp. aureus NCTC 8325Mutation(s): 0 
Gene Names: essBSAOUHSC_00261
Find proteins for Q2G185 (Staphylococcus aureus (strain NCTC 8325 / PS 47))
Explore Q2G185 
Go to UniProtKB:  Q2G185
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.05 Å
  • R-Value Free: 0.181 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 38.704α = 90
b = 58.646β = 90
c = 95.273γ = 90
Software Package:
Software NamePurpose
SHELXL-97refinement
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-05-23
    Type: Initial release
  • Version 1.1: 2012-11-07
    Changes: Database references
  • Version 1.2: 2012-12-26
    Changes: Database references, Structure summary
  • Version 1.3: 2019-05-22
    Changes: Data collection, Other, Refinement description