1AN8

CRYSTAL STRUCTURE OF THE STREPTOCOCCAL SUPERANTIGEN SPE-C


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the streptococcal superantigen SPE-C: dimerization and zinc binding suggest a novel mode of interaction with MHC class II molecules.

Roussel, A.Anderson, B.F.Baker, H.M.Fraser, J.D.Baker, E.N.

(1997) Nat.Struct.Mol.Biol. 4: 635-643


  • PubMed Abstract: 
  • Bacterial superantigens are small proteins that have a very potent stimulatory effect on T lymphocytes through their ability to bind to both MHC class II molecules and T-cell receptors. We have determined the three-dimensional structure of a Streptoc ...

    Bacterial superantigens are small proteins that have a very potent stimulatory effect on T lymphocytes through their ability to bind to both MHC class II molecules and T-cell receptors. We have determined the three-dimensional structure of a Streptococcal superantigen, SPE-C, at 2.4 A resolution. The structure shows that SPE-C has the usual superantigen fold, but that the surface that forms a generic, low-affinity MHC-binding site in other superantigens is here used to create a SPE-C dimer. Instead, MHC class II binding occurs through a zinc binding site that is analogous to a similar site in staphylococcal enterotoxin A. Consideration of the SPE-C dimer suggests a novel mechanism for promotion of MHC aggregation and T-cell activation.


    Organizational Affiliation

    Department of Biochemistry, Massey University, Palmerston North, New Zealand.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
STREPTOCOCCAL PYROGENIC EXOTOXIN C
A
208Streptococcus pyogenes serotype M18 (strain MGAS8232)Mutation(s): 0 
Gene Names: speC
Find proteins for Q8NKX2 (Streptococcus pyogenes serotype M18 (strain MGAS8232))
Go to UniProtKB:  Q8NKX2
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.171 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 75.410α = 90.00
b = 75.410β = 90.00
c = 168.870γ = 90.00
Software Package:
Software NamePurpose
CCP4model building
CCP4data scaling
TNTrefinement
CCP4phasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-04-29
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance