2IJ0

Structural basis of T cell specificity and activation by the bacterial superantigen toxic shock syndrome toxin-1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.242 

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This is version 1.2 of the entry. See complete history


Literature

Structural basis of T-cell specificity and activation by the bacterial superantigen TSST-1.

Moza, B.Varma, A.K.Buonpane, R.A.Zhu, P.Herfst, C.A.Nicholson, M.J.Wilbuer, A.K.Seth, N.P.Wucherpfennig, K.W.McCormick, J.K.Kranz, D.M.Sundberg, E.J.

(2007) EMBO J 26: 1187-1197

  • DOI: 10.1038/sj.emboj.7601531
  • Primary Citation of Related Structures:  
    2IJ0

  • PubMed Abstract: 
  • Superantigens (SAGs) bind simultaneously to major histocompatibility complex (MHC) and T-cell receptor (TCR) molecules, resulting in the massive release of inflammatory cytokines that can lead to toxic shock syndrome (TSS) and death. A major causativ ...

    Superantigens (SAGs) bind simultaneously to major histocompatibility complex (MHC) and T-cell receptor (TCR) molecules, resulting in the massive release of inflammatory cytokines that can lead to toxic shock syndrome (TSS) and death. A major causative agent of TSS is toxic shock syndrome toxin-1 (TSST-1), which is unique relative to other bacterial SAGs owing to its structural divergence and its stringent TCR specificity. Here, we report the crystal structure of TSST-1 in complex with an affinity-matured variant of its wild-type TCR ligand, human T-cell receptor beta chain variable domain 2.1. From this structure and a model of the wild-type complex, we show that TSST-1 engages TCR ligands in a markedly different way than do other SAGs. We provide a structural basis for the high TCR specificity of TSST-1 and present a model of the TSST-1-dependent MHC-SAG-TCR T-cell signaling complex that is structurally and energetically unique relative to those formed by other SAGs. Our data also suggest that protein plasticity plays an exceptionally significant role in this affinity maturation process that results in more than a 3000-fold increase in affinity.


    Organizational Affiliation

    Boston Biomedical Research Institute, Watertown, MA 02472, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Toxic shock syndrome toxin-1AB194Staphylococcus aureusMutation(s): 0 
Gene Names: tst
Find proteins for P06886 (Staphylococcus aureus)
Explore P06886 
Go to UniProtKB:  P06886
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
penultimate affinity-matured variant of hVbeta 2.1, D10CE118Homo sapiensMutation(s): 0 
Gene Names: TRBV20-1TCRBV2S1
Find proteins for A0A5B4 (Homo sapiens)
Explore A0A5B4 
Go to UniProtKB:  A0A5B4
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.242 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 190.898α = 90
b = 68.372β = 106.24
c = 53.549γ = 90
Software Package:
Software NamePurpose
CNSrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-02-20
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance