2NTT

Crystal Structure of SEK


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.56 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.165 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

A novel loop domain in superantigens extends their T cell receptor recognition site

Gunther, S.Varma, A.K.Moza, B.Kasper, K.J.Wyatt, A.W.Zhu, P.Rahman, A.K.Li, Y.Mariuzza, R.A.McCormick, J.K.Sundberg, E.J.

(2007) J Mol Biol 371: 210-221

  • DOI: 10.1016/j.jmb.2007.05.038
  • Primary Citation of Related Structures:  
    2NTT, 2NTS

  • PubMed Abstract: 
  • Superantigens (SAGs) interact with host immune receptors to induce a massive release of inflammatory cytokines that can lead to toxic shock syndrome and death. Bacterial SAGs can be classified into five distinct evolutionary groups. Group V SAGs are ...

    Superantigens (SAGs) interact with host immune receptors to induce a massive release of inflammatory cytokines that can lead to toxic shock syndrome and death. Bacterial SAGs can be classified into five distinct evolutionary groups. Group V SAGs are characterized by the alpha3-beta8 loop, a unique approximately 15 amino acid residue extension that is required for optimal T cell activation. Here, we report the X-ray crystal structures of the group V SAG staphylococcal enterotoxin K (SEK) alone and in complex with the TCR hVbeta5.1 domain. SEK adopts a unique TCR binding orientation relative to other SAG-TCR complexes, which results in the alpha3-beta8 loop contacting the apical loop of framework region 4, thereby extending the known TCR recognition site of SAGs. These interactions are absolutely required for TCR binding and T cell activation by SEK, and dictate the TCR Vbeta domain specificity of SEK and other group V SAGs.


    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Staphylococcal enterotoxin KAB217Staphylococcus aureus subsp. aureus COLMutation(s): 0 
Gene Names: sek
Find proteins for Q93CC5 (Staphylococcus aureus)
Explore Q93CC5 
Go to UniProtKB:  Q93CC5
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.56 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.165 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.774α = 90
b = 45.79β = 90.02
c = 90.696γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
AMoREphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-06-26
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance