6V15

immune receptor complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 

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Literature

The shared susceptibility epitope of HLA-DR4 binds citrullinated self-antigens and the TCR.

Lim, J.J.Jones, C.M.Loh, T.J.Ting, Y.T.Zareie, P.Loh, K.L.Felix, N.J.Suri, A.McKinnon, M.Stevenaert, F.Sharma, R.K.Klareskog, L.Malmstrom, V.Baker, D.G.Purcell, A.W.Reid, H.H.La Gruta, N.L.Rossjohn, J.

(2021) Sci Immunol 6

  • DOI: 10.1126/sciimmunol.abe0896
  • Primary Citation of Related Structures:  
    6V1A, 6V0Y, 6V19, 6V13, 6V15, 6V18

  • PubMed Abstract: 
  • Individuals expressing HLA-DR4 bearing the shared susceptibility epitope (SE) have an increased risk of developing rheumatoid arthritis (RA). Posttranslational modification of self-proteins via citrullination leads to the formation of neoantigens that can be presented by HLA-DR4 SE allomorphs ...

    Individuals expressing HLA-DR4 bearing the shared susceptibility epitope (SE) have an increased risk of developing rheumatoid arthritis (RA). Posttranslational modification of self-proteins via citrullination leads to the formation of neoantigens that can be presented by HLA-DR4 SE allomorphs. However, in T cell-mediated autoimmunity, the interplay between the HLA molecule, posttranslationally modified epitope(s), and the responding T cell repertoire remains unclear. In HLA-DR4 transgenic mice, we show that immunization with a Fibβ-74cit 69-81 peptide led to a population of HLA-DR4 Fibβ-74cit69-81 tetramer + T cells that exhibited biased T cell receptor (TCR) β chain usage, which was attributable to selective clonal expansion from the preimmune repertoire. Crystal structures of pre- and postimmune TCRs showed that the SE of HLA-DR4 represented a main TCR contact zone. Immunization with a double citrullinated epitope (Fibβ-72,74cit 69-81 ) altered the responding HLA-DR4 tetramer + T cell repertoire, which was due to the P2-citrulline residue interacting with the TCR itself. We show that the SE of HLA-DR4 has dual functionality, namely, presentation and a direct TCR recognition determinant. Analogous biased TCR β chain usage toward the Fibβ-74cit 69-81 peptide was observed in healthy HLA-DR4 + individuals and patients with HLA-DR4 + RA, thereby suggesting a link to human RA.


    Organizational Affiliation

    Institute of Infection and Immunity, Cardiff University, School of Medicine, Heath Park, Cardiff CF14 4XN, UK.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class II histocompatibility antigen, DR alpha chainA189Homo sapiensMutation(s): 0 
Gene Names: HLA-DRAHLA-DRA1
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Find proteins for P01903 (Homo sapiens)
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Go to UniProtKB:  P01903
PHAROS:  P01903
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class II histocompatibility antigen, DRB1-4 beta chainB198Homo sapiensMutation(s): 0 
Gene Names: HLA-DRB1
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Find proteins for P01911 (Homo sapiens)
Explore P01911 
Go to UniProtKB:  P01911
PHAROS:  P01911
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Fibrinogen beta 72,74cit69-81C13Homo sapiensMutation(s): 0 
Gene Names: FGB
UniProt & NIH Common Fund Data Resources
Find proteins for P02675 (Homo sapiens)
Explore P02675 
Go to UniProtKB:  P02675
PHAROS:  P02675
Protein Feature View
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
G08 TCR alpha chainD206Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
G08 TCR beta chainE241Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CIR
Query on CIR
CL-PEPTIDE LINKINGC6 H13 N3 O3ARG
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 149.995α = 90
b = 56.548β = 92.205
c = 136.198γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Australian Research Council (ARC)AustraliaCE140100011

Revision History  (Full details and data files)

  • Version 1.0: 2020-11-25
    Type: Initial release
  • Version 1.1: 2021-06-09
    Changes: Database references