1LO5

Crystal structure of the D227A variant of Staphylococcal enterotoxin A in complex with human MHC class II


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.339 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.245 

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This is version 1.3 of the entry. See complete history


Literature

Crystal Structure of a SEA Variant in Complex with MHC Class II Reveals the Ability of SEA to Crosslink MHC Molecules

Petersson, K.Thunnissen, M.Forsberg, G.Walse, B.

(2002) Structure 10: 1619-1626

  • DOI: 10.1016/s0969-2126(02)00895-x
  • Primary Citation of Related Structures:  
    1LO5

  • PubMed Abstract: 
  • Although the biological properties of staphylococcal enterotoxin A (SEA) have been well characterized, structural insights into the interaction between SEA and major histocompatibilty complex (MHC) class II have only been obtained by modeling. Here, the crystal structure of the D227A variant of SEA in complex with human MHC class II has been determined by X-ray crystallography ...

    Although the biological properties of staphylococcal enterotoxin A (SEA) have been well characterized, structural insights into the interaction between SEA and major histocompatibilty complex (MHC) class II have only been obtained by modeling. Here, the crystal structure of the D227A variant of SEA in complex with human MHC class II has been determined by X-ray crystallography. SEA(D227A) exclusively binds with its N-terminal domain to the alpha chain of HLA-DR1. The ability of one SEA molecule to crosslink two MHC molecules was modeled. It shows that this SEA molecule cannot interact with the T cell receptor (TCR) while a second SEA molecule interacts with MHC. Because of its relatively low toxicity, the D227A variant of SEA is used in tumor therapy.


    Organizational Affiliation

    Molecular Biophysics, Centre for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, S-221 00 Lund, Sweden.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class II histocompatibility antigen, DR alpha chain A182Homo sapiensMutation(s): 0 
Gene Names: HLA-DRAHLA-DRA1
Find proteins for P01903 (Homo sapiens)
Explore P01903 
Go to UniProtKB:  P01903
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PHAROS:  P01903
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class II histocompatibility antigen, DR-1 beta chain B190Homo sapiensMutation(s): 0 
Gene Names: HLA-DRB1
Find proteins for P01911 (Homo sapiens)
Explore P01911 
Go to UniProtKB:  P01911
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PHAROS:  P01911
Protein Feature View
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Hemagglutinin peptide C13N/AMutation(s): 0 
Protein Feature View
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
enterotoxin A D233Staphylococcus aureusMutation(s): 1 
Gene Names: entA
Find proteins for P0A0L2 (Staphylococcus aureus)
Explore P0A0L2 
Go to UniProtKB:  P0A0L2
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.339 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.245 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.008α = 90
b = 75.792β = 90
c = 198.082γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing
CNSrefinement
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-12-18
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-05-23
    Changes: Data collection