4ANN

Crystal Structure Staphylococcus aureus ESSB cytoplasmic fragment


Experimental Data Snapshot

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

wwPDB Validation 3D Report Full Report


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

  • 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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ESSB
A
215Staphylococcus aureus (strain NCTC 8325)Mutation(s): 0 
Gene Names: essB
Find proteins for Q2G185 (Staphylococcus aureus (strain NCTC 8325))
Go to UniProtKB:  Q2G185
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 = 90.00
b = 58.646β = 90.00
c = 95.273γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling
PHASERphasing
SHELXL-97refinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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