6RSY

The complex between TCR a7b2 and human Class I MHC HLA-A0201-WT1 with the bound RMFPNAPYL peptide.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.253 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Specificity of bispecific T cell receptors and antibodies targeting peptide-HLA.

Holland, C.J.Crean, R.M.Pentier, J.M.de Wet, B.Lloyd, A.Srikannathasan, V.Lissin, N.Lloyd, K.A.Blicher, T.H.Conroy, P.J.Hock, M.Pengelly, R.J.Spinner, T.E.Cameron, B.Potter, E.A.Jeyanthan, A.Molloy, P.E.Sami, M.Aleksic, M.Liddy, N.Robinson, R.A.Harper, S.Lepore, M.Pudney, C.R.van der Kamp, M.W.Rizkallah, P.J.Jakobsen, B.K.Vuidepot, A.Cole, D.K.

(2020) J Clin Invest 130: 2673-2688

  • DOI: 10.1172/JCI130562
  • Primary Citation of Related Structures:  
    6RSY

  • PubMed Abstract: 
  • Tumor-associated peptide-human leukocyte antigen complexes (pHLAs) represent the largest pool of cell surface-expressed cancer-specific epitopes, making them attractive targets for cancer therapies. Soluble bispecific molecules that incorporate an an ...

    Tumor-associated peptide-human leukocyte antigen complexes (pHLAs) represent the largest pool of cell surface-expressed cancer-specific epitopes, making them attractive targets for cancer therapies. Soluble bispecific molecules that incorporate an anti-CD3 effector function are being developed to redirect T cells against these targets using 2 different approaches. The first achieves pHLA recognition via affinity-enhanced versions of natural TCRs (e.g., immune-mobilizing monoclonal T cell receptors against cancer [ImmTAC] molecules), whereas the second harnesses an antibody-based format (TCR-mimic antibodies). For both classes of reagent, target specificity is vital, considering the vast universe of potential pHLA molecules that can be presented on healthy cells. Here, we made use of structural, biochemical, and computational approaches to investigate the molecular rules underpinning the reactivity patterns of pHLA-targeting bispecifics. We demonstrate that affinity-enhanced TCRs engage pHLA using a comparatively broad and balanced energetic footprint, with interactions distributed over several HLA and peptide side chains. As ImmTAC molecules, these TCRs also retained a greater degree of pHLA selectivity, with less off-target activity in cellular assays. Conversely, TCR-mimic antibodies tended to exhibit binding modes focused more toward hot spots on the HLA surface and exhibited a greater degree of crossreactivity. Our findings extend our understanding of the basic principles that underpin pHLA selectivity and exemplify a number of molecular approaches that can be used to probe the specificity of pHLA-targeting molecules, aiding the development of future reagents.


    Organizational Affiliation

    Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class I histocompatibility antigen, A-2 alpha chainAF276Homo sapiensMutation(s): 0 
Gene Names: HLA-AHLAA
Find proteins for P04439 (Homo sapiens)
Explore P04439 
Go to UniProtKB:  P04439
NIH Common Fund Data Resources
PHAROS  P04439
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinBG100Homo sapiensMutation(s): 0 
Gene Names: B2MCDABP0092HDCMA22P
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
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PHAROS  P61769
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
ARG-MET-PHE-PRO-ASN-ALA-PRO-TYR-LEUCH9Homo sapiensMutation(s): 0 
Gene Names: WT1
Find proteins for P19544 (Homo sapiens)
Explore P19544 
Go to UniProtKB:  P19544
NIH Common Fund Data Resources
PHAROS  P19544
Protein Feature View
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
a7b2 ALPHA CHAINDI208Homo sapiensMutation(s): 0 
Protein Feature View
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
DMF4 Beta CHAINEJ245Homo sapiensMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download CCD File 
A, F
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.253 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 94.61α = 90
b = 114.75β = 90
c = 185.39γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
xia2data reduction
xia2data scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2020-04-15
    Type: Initial release
  • Version 1.1: 2020-04-29
    Changes: Database references
  • Version 1.2: 2020-05-13
    Changes: Database references