2IAN

Structural basis for recognition of mutant self by a tumor-specific, MHC class II-restricted TCR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.225 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural basis for the recognition of mutant self by a tumor-specific, MHC class II-restricted T cell receptor

Deng, L.Langley, R.J.Brown, P.H.Xu, G.Teng, L.Wang, Q.Gonzales, M.I.Callender, G.G.Nishimura, M.I.Topalian, S.L.Mariuzza, R.A.

(2007) Nat Immunol 8: 398-408

  • DOI: https://doi.org/10.1038/ni1447
  • Primary Citation of Related Structures:  
    2IAL, 2IAM, 2IAN

  • PubMed Abstract: 
  • Structural studies of complexes of T cell receptor (TCR) and peptide-major histocompatibility complex (MHC) have focused on TCRs specific for foreign antigens or native self. An unexplored category of TCRs includes those specific for self determinants bearing alterations resulting from disease, notably cancer ...

    Structural studies of complexes of T cell receptor (TCR) and peptide-major histocompatibility complex (MHC) have focused on TCRs specific for foreign antigens or native self. An unexplored category of TCRs includes those specific for self determinants bearing alterations resulting from disease, notably cancer. We determined here the structure of a human melanoma-specific TCR (E8) bound to the MHC molecule HLA-DR1 and an epitope from mutant triosephosphate isomerase. The structure had features intermediate between 'anti-foreign' and autoimmune TCR-peptide-MHC class II complexes that may reflect the hybrid nature of altered self. E8 manifested very low affinity for mutant triosephosphate isomerase-HLA-DR1 despite the highly tumor-reactive properties of E8 cells. A second TCR (G4) had even lower affinity but underwent peptide-specific formation of dimers, suggesting this as a mechanism for enhancing low-affinity TCR-peptide-MHC interactions for T cell activation.


    Organizational Affiliation

    Center for Advanced Research in Biotechnology, WM Keck Laboratory for Structural Biology, University of Maryland Biotechnology Institute, Rockville, Maryland 20850, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class II histocompatibility antigen, DR alpha chainA, F, K, P182Homo sapiensMutation(s): 0 
Gene Names: HLA-DRAHLA-DRA1
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PHAROS:  P01903
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UniProt GroupP01903
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class II histocompatibility antigen, DRB1-1 beta chainB, G, L, Q190Homo sapiensMutation(s): 0 
Gene Names: HLA-DRB1
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PHAROS:  P01911
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
15-mer peptide from Triosephosphate isomeraseC, H, M, R15Homo sapiensMutation(s): 0 
Gene Names: TPI1TPI
EC: 5.3.1.1 (PDB Primary Data), 4.2.3.3 (UniProt)
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
CD4+ T cell receptor E8 alpha chainD, I, N, S202Homo sapiensMutation(s): 0 
Gene Names: TRACTCRA
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
CD4+ T cell receptor E8 beta chainE, J, O, T240Homo sapiensMutation(s): 0 
Gene Names: TRBC1
UniProt
Find proteins for P01850 (Homo sapiens)
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UniProt GroupP01850
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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.225 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 93.474α = 90
b = 242.866β = 111.32
c = 105.222γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
CrystalCleardata collection
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-04-03
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance