6Q3S

Engineered Human HLA_A2 MHC Class I molecule in complex with TCR and SV9 peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.231 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

High-throughput peptide-MHC complex generation and kinetic screenings of TCRs with peptide-receptive HLA-A*02:01 molecules.

Moritz, A.Anjanappa, R.Wagner, C.Bunk, S.Hofmann, M.Pszolla, G.Saikia, A.Garcia-Alai, M.Meijers, R.Rammensee, H.G.Springer, S.Maurer, D.

(2019) Sci Immunol 4

  • DOI: https://doi.org/10.1126/sciimmunol.aav0860
  • Primary Citation of Related Structures:  
    6Q3S

  • PubMed Abstract: 

    Major histocompatibility complex (MHC) class I molecules present short peptide ligands on the cell surface for interrogation by cytotoxic CD8 + T cells. MHC class I complexes presenting tumor-associated peptides such as neoantigens represent key targets of cancer immunotherapy approaches currently in development, making them important for efficacy and safety screenings. Without peptide ligand, MHC class I complexes are unstable and decay quickly, making the production of soluble monomers for analytical purposes labor intensive. We have developed a disulfide-stabilized HLA-A*02:01 molecule that is stable without peptide but can form peptide-MHC complexes (pMHCs) with ligands of choice in a one-step loading procedure. We illustrate the similarity between the engineered mutant and the wild-type molecule with respect to affinity of wild-type or affinity-matured T cell receptors (TCRs) and present a crystal structure corroborating the binding kinetics measurements. In addition, we demonstrate a high-throughput binding kinetics measurement platform to analyze the binding characteristics of bispecific TCR (bsTCR) molecules against diverse pMHC libraries produced with the disulfide-stabilized HLA-A*02:01 molecule. We show that bsTCR affinities for pMHCs are indicative of in vitro function and generate a bsTCR binding motif to identify potential off-target interactions in the human proteome. These findings showcase the potential of the platform and the engineered HLA-A*02:01 molecule in the emerging field of pMHC-targeting biologics.


  • Organizational Affiliation

    Immatics Biotechnologies GmbH, Tübingen, Germany.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HLA class I histocompatibility antigen, A-2 alpha chain276Homo sapiensMutation(s): 0 
Gene Names: HLA-AHLAA
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Find proteins for P04439 (Homo sapiens)
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Go to UniProtKB:  P04439
GTEx:  ENSG00000206503 
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UniProt GroupP04439
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-2-microglobulin100Homo sapiensMutation(s): 0 
Gene Names: B2MCDABP0092HDCMA22P
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Find proteins for P61769 (Homo sapiens)
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Go to UniProtKB:  P61769
GTEx:  ENSG00000166710 
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UniProt GroupP61769
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
SER-LEU-LEU-MET-TRP-ILE-THR-GLN-VAL9Homo sapiensMutation(s): 0 
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
T cell receptor alpha variable 21,T-cell receptor, sp3.4 alpha chain207Homo sapiensMutation(s): 0 
Gene Names: TRAV21
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Find proteins for K7N5N2 (Homo sapiens)
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Find proteins for A0A0B4J279 (Homo sapiens)
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GTEx:  ENSG00000211801 
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UniProt GroupsK7N5N2A0A0B4J279
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
T cell receptor beta variable 6-5,Human nkt tcr beta chain241Homo sapiensMutation(s): 0 
Gene Names: TRBV6-5B2MHDCMA22P
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Find proteins for A0A0K0K1A5 (Homo sapiens)
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GTEx:  ENSG00000211721 
Find proteins for K7N5M4 (Homo sapiens)
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UniProt GroupsK7N5M4A0A0K0K1A5
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Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.231 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.445α = 90
b = 53.669β = 98.02
c = 121.741γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Commission653706

Revision History  (Full details and data files)

  • Version 1.0: 2019-07-24
    Type: Initial release
  • Version 1.1: 2021-02-03
    Changes: Database references