4GRL

Crystal structure of a autoimmune TCR-MHC complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.86 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.202 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Crossreactivity of a human autoimmune TCR is dominated by a single TCR loop.

Sethi, D.K.Gordo, S.Schubert, D.A.Wucherpfennig, K.W.

(2013) Nat Commun 4: 2623-2623

  • DOI: 10.1038/ncomms3623
  • Primary Citation of Related Structures:  4MAY

  • PubMed Abstract: 
  • Self-reactive CD4 T cells are thought to have a central role in the pathogenesis of many chronic inflammatory human diseases. Microbial peptides can activate self-reactive T cells, but the structural basis for such crossreactivity is not well underst ...

    Self-reactive CD4 T cells are thought to have a central role in the pathogenesis of many chronic inflammatory human diseases. Microbial peptides can activate self-reactive T cells, but the structural basis for such crossreactivity is not well understood. The Hy.1B11 T cell receptor (TCR) originates from a patient with multiple sclerosis and recognizes the self-antigen myelin basic protein. Here we report the structural mechanism of TCR crossreactivity with two distinct peptides from human pathogens. The structures show that a single TCR residue (CDR3α F95) makes the majority of contacts with the self-peptide and both microbial peptides (66.7-80.6%) due to a highly tilted TCR-binding topology on the peptide-MHC surface. Further, a neighbouring residue located on the same TCR loop (CDR3α E98) forms an energetically critical interaction with the MHC molecule. These data show how binding by a self-reactive TCR favors crossreactivity between self and microbial antigens.


    Organizational Affiliation

    Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MHC class II HLA-DQ-alpha chain
A
183Homo sapiensGene Names: HLA-DQA1
Find proteins for Q30066 (Homo sapiens)
Go to Gene View: HLA-DQA1
Go to UniProtKB:  Q30066
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
MHC class II antigen
B
200Homo sapiensGene Names: HLA-DQB1
Find proteins for Q67AJ6 (Homo sapiens)
Go to Gene View: HLA-DQB1
Go to UniProtKB:  Q67AJ6
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
TCR Hy.1B11 alpha chain
C
209N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
TCR Hy.1B11 beta chain
D
268N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download SDF File 
Download CCD File 
B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.86 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.202 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 72.011α = 90.00
b = 125.583β = 90.00
c = 134.794γ = 90.00
Software Package:
Software NamePurpose
ADSCdata collection
XDSdata reduction
SCALAdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-11-06
    Type: Initial release