8QFY

Crystal structure of high affinity TCR in complex with pHLA harbouring bacterial peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.33 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.242 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

An HLA-E-targeted TCR bispecific molecule redirects T cell immunity against Mycobacterium tuberculosis.

Paterson, R.L.La Manna, M.P.Arena De Souza, V.Walker, A.Gibbs-Howe, D.Kulkarni, R.Fergusson, J.R.Mulakkal, N.C.Monteiro, M.Bunjobpol, W.Dembek, M.Martin-Urdiroz, M.Grant, T.Barber, C.Garay-Baquero, D.J.Tezera, L.B.Lowne, D.Britton-Rivet, C.Pengelly, R.Chepisiuk, N.Singh, P.K.Woon, A.P.Powlesland, A.S.McCully, M.L.Caccamo, N.Salio, M.Badami, G.D.Dorrell, L.Knox, A.Robinson, R.Elkington, P.Dieli, F.Lepore, M.Leonard, S.Godinho, L.F.

(2024) Proc Natl Acad Sci U S A 121: e2318003121-e2318003121

  • DOI: https://doi.org/10.1073/pnas.2318003121
  • Primary Citation of Related Structures:  
    8QFY

  • PubMed Abstract: 

    Peptides presented by HLA-E, a molecule with very limited polymorphism, represent attractive targets for T cell receptor (TCR)-based immunotherapies to circumvent the limitations imposed by the high polymorphism of classical HLA genes in the human population. Here, we describe a TCR-based bispecific molecule that potently and selectively binds HLA-E in complex with a peptide encoded by the inhA gene of Mycobacterium tuberculosis (Mtb), the causative agent of tuberculosis in humans. We reveal the biophysical and structural bases underpinning the potency and specificity of this molecule and demonstrate its ability to redirect polyclonal T cells to target HLA-E-expressing cells transduced with mycobacterial inhA as well as primary cells infected with virulent Mtb. Additionally, we demonstrate elimination of Mtb-infected cells and reduction of intracellular Mtb growth. Our study suggests an approach to enhance host T cell immunity against Mtb and provides proof of principle for an innovative TCR-based therapeutic strategy overcoming HLA polymorphism and therefore applicable to a broader patient population.


  • Organizational Affiliation

    Immunocore Ltd., Abingdon, Oxfordshire OX14 4RY, United Kingdom.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HLA class I histocompatibility antigen, alpha chain EA [auth AAA],
F [auth FFF]
276Homo sapiensMutation(s): 0 
Gene Names: HLA-EHLA-6.2HLAE
UniProt & NIH Common Fund Data Resources
Find proteins for P13747 (Homo sapiens)
Explore P13747 
Go to UniProtKB:  P13747
PHAROS:  P13747
GTEx:  ENSG00000204592 
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UniProt GroupP13747
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-2-microglobulinB [auth BBB],
G [auth GGG]
100Homo sapiensMutation(s): 0 
Gene Names: B2MCDABP0092HDCMA22P
UniProt & NIH Common Fund Data Resources
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
PHAROS:  P61769
GTEx:  ENSG00000166710 
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UniProt GroupP61769
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  • Reference Sequence

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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Peptide from inhAC [auth CCC],
H [auth HHH]
9Mycobacterium tuberculosisMutation(s): 0 
Sequence Annotations
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
T-cell receptor alpha chainD [auth DDD],
I [auth III]
197Homo sapiensMutation(s): 0 
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  • Reference Sequence
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
T-cell receptor beta chainE [auth EEE],
J [auth JJJ]
243Homo sapiensMutation(s): 0 
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.33 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.242 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 326.828α = 90
b = 79.879β = 96.894
c = 104.073γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DIALSdata reduction
DIALSdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2024-05-15
    Type: Initial release