1CK1

STRUCTURE OF STAPHYLOCOCCAL ENTEROTOXIN C3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.162 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Zinc-mediated dimerization and its effect on activity and conformation of staphylococcal enterotoxin type C.

Chi, Y.I.Sadler, I.Jablonski, L.M.Callantine, S.D.Deobald, C.F.Stauffacher, C.V.Bohach, G.A.

(2002) J.Biol.Chem. 277: 22839-22846

  • DOI: 10.1074/jbc.M201932200

  • PubMed Abstract: 
  • Staphylococcal enterotoxins are superantigen exotoxins that mediate food poisoning and toxic shock syndrome in humans. Despite their structural and functional similarities, superantigens display subtle differences in biological properties and modes o ...

    Staphylococcal enterotoxins are superantigen exotoxins that mediate food poisoning and toxic shock syndrome in humans. Despite their structural and functional similarities, superantigens display subtle differences in biological properties and modes of receptor binding as a result of zinc atoms bound differently in their crystal structures. For example, the crystal structures of the staphylococcal enterotoxins in the type C serogroup (SECs) contain a zinc atom coordinated by one aspartate and two histidine residues from one molecule and another aspartate residue from the next molecule, thus forming a dimer. This type of zinc ligation and zinc-mediated dimerization occurs in several SECs, but not in most other staphylococcal enterotoxin serogroups. This prompted us to investigate the potential importance of zinc in SEC-mediated pathogenesis. Site-directed mutagenesis was used to replace SEC zinc binding ligands with alanine. SEC mutants unable to bind zinc did not have major conformational alterations although they failed to form dimers. Zinc binding was not essential for T cell stimulation, emesis, or lethality although in general the mutants were less pyrogenic. Thus the zinc atom in SECs might represent a non-functional heavy atom in an exotoxin group that has diverged from related bacterial toxins containing crucial zinc atoms.


    Organizational Affiliation

    Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA. young-in.chi@joslin.harvard.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (ENTEROTOXIN TYPE C-3)
A
239Staphylococcus aureusN/A
Find proteins for Q06535 (Staphylococcus aureus)
Go to UniProtKB:  Q06535
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.162 
  • Space Group: P 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 43.700α = 90.00
b = 43.700β = 90.00
c = 280.500γ = 90.00
Software Package:
Software NamePurpose
CCP4data reduction
XDSdata reduction
X-PLORrefinement
AMoREphasing
CCP4data scaling
XDSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-07-10
    Type: Initial release
  • Version 1.1: 2007-10-16
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance