1JCK

T-CELL RECEPTOR BETA CHAIN COMPLEXED WITH SEC3 SUPERANTIGEN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.328 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.238 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of a T-cell receptor beta-chain complexed with a superantigen.

Fields, B.A.Malchiodi, E.L.Li, H.Ysern, X.Stauffacher, C.V.Schlievert, P.M.Karjalainen, K.Mariuzza, R.A.

(1996) Nature 384: 188-192

  • DOI: 10.1038/384188a0
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Superantigens (SAgs) are viral or bacterial proteins that act as potent T-cell stimulants and have been implicated in a number of human diseases, including toxic shock syndrome, diabetes mellitus and multiple sclerosis. The interaction of SAgs with t ...

    Superantigens (SAgs) are viral or bacterial proteins that act as potent T-cell stimulants and have been implicated in a number of human diseases, including toxic shock syndrome, diabetes mellitus and multiple sclerosis. The interaction of SAgs with the T-cell receptor (TCR) and major histocompatibility complex (MHC) proteins results in the stimulation of a disproportionately large fraction of the T-cell population. We report here the crystal structures of the beta-chain of a TCR complexed with the Staphylococcus aureus enterotoxins C2 and C3 (SEC2, SEC3). These enterotoxins, which cause both toxic shock and food poisoning, bind in an identical way to the TCR beta-chain. The complementarity-determining region 2 (CDR2) of the beta-chain and, to lesser extents, CDR1 and hypervariable region 4 (HV4), bind in a cleft between the two domains of the SAgs. Thus, there is considerable overlap between the SAg-binding site and the peptide/MHC-binding sites of the TCR. A model of a TCR-SAg-MHC complex constructed from the crystal structures of (1) the beta-chain-SEC3 complex, (2) a complex between staphylococcal enterotoxin B (SEB) and an MHC molecule, and (3) a TCR V(alpha) domain, reveals that the SAg acts as a wedge between the TCR and MHC to displace the antigenic peptide away from the TCR combining site. In this way, the SAg is able to circumvent the normal mechanism for T-cell activation by specific peptide/MHC complexes.


    Related Citations: 
    • Crystal Structure of the Beta Chain of a T Cell Antigen Receptor
      Bentley, G.A., Boulot, G., Karjalainen, K., Mariuzza, R.A.
      (1995) Science 267: 1984
    • Superantigen Binding to a T Cell Receptor Beta Chain of Known Three-Dimensional Structure
      Malchiodi, E.L., Eisenstein, E., Fields, B.A., Ohlendorf, D.H., Schlievert, P.M., Karjalainen, K., Mariuzza, R.A.
      (1995) J Exp Med 182: 1833
    • Crystal Structure of the V Alpha Domain of a T Cell Antigen Receptor
      Fields, B.A., Ober, B., Malchiodi, E.L., Lebedeva, M.I., Braden, B.C., Ysern, X., Kim, J.K., Shao, X., Ward, E.S., Mariuzza, R.A.
      (1995) Science 270: 1821

    Organizational Affiliation

    Center for Advanced Research in Biotechnology, University of Maryland Biotechnology Institute, Rockville, Maryland 20850, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
14.3.D T CELL ANTIGEN RECEPTOR
A, C
238Mus musculusMutation(s): 3 
Protein Feature View is not available: No corresponding UniProt sequence found.

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
STAPHYLOCOCCAL ENTEROTOXIN C3
B, D
239Staphylococcus aureusMutation(s): 0 
Gene Names: entC3
Find proteins for P0A0L5 (Staphylococcus aureus)
Go to UniProtKB:  P0A0L5
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.328 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.238 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.4α = 90
b = 87.6β = 93.3
c = 71.4γ = 90
Software Package:
Software NamePurpose
HKL/DENZOdata collection
SCALEPACKdata scaling
X-PLORmodel building
X-PLORrefinement
HKLdata reduction
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-11-12
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance