3SEB

STAPHYLOCOCCAL ENTEROTOXIN B


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.48 Å

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of microbial superantigen staphylococcal enterotoxin B at 1.5 A resolution: implications for superantigen recognition by MHC class II molecules and T-cell receptors.

Papageorgiou, A.C.Tranter, H.S.Acharya, K.R.

(1998) J.Mol.Biol. 277: 61-79

  • DOI: 10.1006/jmbi.1997.1577

  • PubMed Abstract: 
  • Staphylococcal enterotoxin B is a member of a family of toxins known as superantigens that activate a large number of T-cells (up to 20%) by cross-linking MHC class II molecules with T-cell receptors in a Vbeta-restricted fashion. The crystal structu ...

    Staphylococcal enterotoxin B is a member of a family of toxins known as superantigens that activate a large number of T-cells (up to 20%) by cross-linking MHC class II molecules with T-cell receptors in a Vbeta-restricted fashion. The crystal structure of staphylococcal enterotoxin B presented here has been determined at 1.5 A resolution, the highest resolution so far for a superantigen. The final model contains 1948 protein atoms and 177 water molecules and has excellent geometry with root-mean-square (rms) deviation of 0.007 A and 1.73 degrees in bond lengths and bond angles, respectively. The overall fold is similar to that of other microbial superantigens, but as it lacks the zinc-binding site found in other members of this family, such as staphylococcal enterotoxin A, C2 and D, this enterotoxin possesses only one MHC class II binding site. Comparison of the crystal structure of free SEB and in complex with an MHC class II molecule revealed no major changes in the MHC-binding site upon complex formation. However, a number of water molecules found in the free SEB may be displaced in the complex or contribute further to its stability. Detailed analysis of the TcR-binding site of SEB, SEA and SEC2 shows significant differences which may account for the ability of each superantigen to bind specific Vbeta sequences.


    Related Citations: 
    • Superantigens as Immunomodulators: Recent Structural Insights
      Papageorgiou, A.C.,Acharya, K.R.
      (1997) Structure 5: 991
    • Crystal Structure of the Superantigen Enterotoxin C2 from Staphylococcus Aureus Reveals a Zinc-Binding Site
      Papageorgiou, A.C.,Acharya, K.R.,Shapiro, R.,Passalacqua, E.F.,Brehm, R.D.,Tranter, H.S.
      (1995) Structure 3: 769


    Organizational Affiliation

    Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath, BA2 7AY, U.K.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
STAPHYLOCOCCAL ENTEROTOXIN B
A
238Staphylococcus aureusMutation(s): 0 
Gene Names: entB
Find proteins for P01552 (Staphylococcus aureus)
Go to UniProtKB:  P01552
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.48 Å
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 45.404α = 90.00
b = 67.720β = 90.00
c = 79.065γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SHELXL-97phasing
SHELXL-97model building
SCALEPACKdata scaling
SHELXL-97refinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-05-27
    Type: Initial release
  • Version 1.1: 2008-03-25
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance