6DFW

TCR 8F10 in complex with IAg7-p8G9E


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.236 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

How C-terminal additions to insulin B-chain fragments create superagonists for T cells in mouse and human type 1 diabetes.

Wang, Y.Sosinowski, T.Novikov, A.Crawford, F.White, J.Jin, N.Liu, Z.Zou, J.Neau, D.Davidson, H.W.Nakayama, M.Kwok, W.W.Gapin, L.Marrack, P.Kappler, J.W.Dai, S.

(2019) Sci Immunol 4

  • DOI: https://doi.org/10.1126/sciimmunol.aav7517
  • Primary Citation of Related Structures:  
    6DFQ, 6DFS, 6DFV, 6DFW, 6DFX

  • PubMed Abstract: 

    In type 1 diabetes (T1D), proinsulin is a major autoantigen and the insulin B:9-23 peptide contains epitopes for CD4 + T cells in both mice and humans. This peptide requires carboxyl-terminal mutations for uniform binding in the proper position within the mouse IA g7 or human DQ8 major histocompatibility complex (MHC) class II (MHCII) peptide grooves and for strong CD4 + T cell stimulation. Here, we present crystal structures showing how these mutations control CD4 + T cell receptor (TCR) binding to these MHCII-peptide complexes. Our data reveal stricking similarities between mouse and human CD4 + TCRs in their interactions with these ligands. We also show how fusions between fragments of B:9-23 and of proinsulin C-peptide create chimeric peptides with activities as strong or stronger than the mutated insulin peptides. We propose transpeptidation in the lysosome as a mechanism that could accomplish these fusions in vivo, similar to the creation of fused peptide epitopes for MHCI presentation shown to occur by transpeptidation in the proteasome. Were this mechanism limited to the pancreas and absent in the thymus, it could provide an explanation for how diabetogenic T cells escape negative selection during development but find their modified target antigens in the pancreas to cause T1D.


  • Organizational Affiliation

    Department of Biomedical Research, National Jewish Health, Denver, CO 80206, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
H-2 class II histocompatibility antigen, A-D alpha chainA,
E [auth C]
183Mus musculusMutation(s): 0 
Gene Names: H2-Aa
UniProt
Find proteins for P04228 (Mus musculus)
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Go to UniProtKB:  P04228
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UniProt GroupP04228
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
H2-Ab1 proteinB,
F [auth D]
221Mus musculusMutation(s): 0 
Gene Names: H2-Ab1
UniProt
Find proteins for Q31135 (Mus musculus)
Explore Q31135 
Go to UniProtKB:  Q31135
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UniProt GroupQ31135
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
8F10 alpha chainC [auth E],
G
210Mus musculusMutation(s): 0 
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
8F10 beta chainD [auth F],
H
241Mus musculusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.236 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 93.094α = 90
b = 102.044β = 107.83
c = 136.001γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-04-17
    Type: Initial release