2XFX

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.198 

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

  • 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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MHC CLASS 1
A
277Bos taurusMutation(s): 0 
Gene Names: HD6
Find proteins for Q30291 (Bos taurus)
Go to UniProtKB:  Q30291
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
BETA-2-MICROGLOBULIN
B
99Bos taurusMutation(s): 0 
Gene Names: B2M
Find proteins for P01888 (Bos taurus)
Go to Gene View: B2M
Go to UniProtKB:  P01888
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
UNCHARACTERIZED PROTEIN
C
11Theileria parvaMutation(s): 0 
Find proteins for Q4MYJ2 (Theileria parva)
Go to UniProtKB:  Q4MYJ2
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.198 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 44.611α = 90.00
b = 97.888β = 90.00
c = 123.717γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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