2XFX

cattle MHC class I N01301 presenting an 11mer from Theileria parva


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Mhc Class I Bound to an Immunodominant Theileria Parva Epitope Demonstrates Unconventional Presentation to T Cell Receptors.

Macdonald, I.K.Harkiolaki, M.Hunt, L.Connelley, T.Carroll, A.V.Machugh, N.D.Graham, S.P.Jones, E.Y.Morrison, W.I.Flower, D.R.Ellis, S.A.

(2010) PLoS Pathog 6: 01149

  • DOI: 10.1371/journal.ppat.1001149
  • Primary Citation of Related Structures:  
    2XFX

  • PubMed Abstract: 
  • T cell receptor (TCR) recognition of peptide-MHC class I (pMHC) complexes is a crucial event in the adaptive immune response to pathogens. Peptide epitopes often display a strong dominance hierarchy, resulting in focusing of the response on a limited ...

    T cell receptor (TCR) recognition of peptide-MHC class I (pMHC) complexes is a crucial event in the adaptive immune response to pathogens. Peptide epitopes often display a strong dominance hierarchy, resulting in focusing of the response on a limited number of the most dominant epitopes. Such T cell responses may be additionally restricted by particular MHC alleles in preference to others. We have studied this poorly understood phenomenon using Theileria parva, a protozoan parasite that causes an often fatal lymphoproliferative disease in cattle. Despite its antigenic complexity, CD8+ T cell responses induced by infection with the parasite show profound immunodominance, as exemplified by the Tp1(214-224) epitope presented by the common and functionally important MHC class I allele N*01301. We present a high-resolution crystal structure of this pMHC complex, demonstrating that the peptide is presented in a distinctive raised conformation. Functional studies using CD8+ T cell clones show that this impacts significantly on TCR recognition. The unconventional structure is generated by a hydrophobic ridge within the MHC peptide binding groove, found in a set of cattle MHC alleles. Extremely rare in all other species, this feature is seen in a small group of mouse MHC class I molecules. The data generated in this analysis contribute to our understanding of the structural basis for T cell-dependent immune responses, providing insight into what determines a highly immunogenic p-MHC complex, and hence can be of value in prediction of antigenic epitopes and vaccine design.


    Organizational Affiliation

    The Jenner Institute, University of Oxford, Compton, Berkshire, United Kingdom.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MHC CLASS 1A277Bos taurusMutation(s): 0 
Gene Names: HD6
Find proteins for Q30291 (Bos taurus)
Explore Q30291 
Go to UniProtKB:  Q30291
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
BETA-2-MICROGLOBULINB99Bos taurusMutation(s): 0 
Gene Names: B2M
Find proteins for P01888 (Bos taurus)
Explore P01888 
Go to UniProtKB:  P01888
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
UNCHARACTERIZED PROTEINC11Theileria parvaMutation(s): 0 
Gene Names: TP03_0849
Find proteins for Q4MYJ2 (Theileria parva)
Explore Q4MYJ2 
Go to UniProtKB:  Q4MYJ2
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.611α = 90
b = 97.888β = 90
c = 123.717γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-10-27
    Type: Initial release
  • Version 1.1: 2012-03-28
    Changes: Data collection, Database references, Derived calculations, Version format compliance