4JRX

Crystal Structure of CA5 TCR-HLA B*3505-LPEP complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.205 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Highly divergent T-cell receptor binding modes underlie specific recognition of a bulged viral peptide bound to a human leukocyte antigen class I molecule.

Liu, Y.C., Miles, J.J., Neller, M.A., Gostick, E., Price, D.A., Purcell, A.W., McCluskey, J., Burrows, S.R., Rossjohn, J., Gras, S.

(2013) J Biol Chem 288: 15442-15454

  • DOI: 10.1074/jbc.M112.447185
  • Primary Citation of Related Structures:  
    4JRX, 4JRY

  • PubMed Abstract: 

    • Human leukocyte antigen (HLA)-I molecules can present long peptides, yet the mechanisms by which T-cell receptors (TCRs) recognize featured pHLA-I landscapes are unclear. We compared the binding modes of three distinct human TCRs, CA5, SB27, and SB47, complexed with a "super-bulged" viral peptide (LPEPLPQGQLTAY) restricted by HLA-B*35:08 ...

    Human leukocyte antigen (HLA)-I molecules can present long peptides, yet the mechanisms by which T-cell receptors (TCRs) recognize featured pHLA-I landscapes are unclear. We compared the binding modes of three distinct human TCRs, CA5, SB27, and SB47, complexed with a "super-bulged" viral peptide (LPEPLPQGQLTAY) restricted by HLA-B*35:08. The CA5 and SB27 TCRs engaged HLA-B*35:08(LPEP) similarly, straddling the central region of the peptide but making limited contacts with HLA-B*35:08. Remarkably, the CA5 TCR did not contact the α1-helix of HLA-B*35:08. Differences in the CDR3β loop between the CA5 and SB27 TCRs caused altered fine specificities. Surprisingly, the SB47 TCR engaged HLA-B*35:08(LPEP) using a completely distinct binding mechanism, namely "bypassing" the bulged peptide and making extensive contacts with the extreme N-terminal end of HLA-B*35:08. This docking footprint included HLA-I residues not observed previously as TCR contact sites. The three TCRs exhibited differing patterns of alloreactivity toward closely related or distinct HLA-I allotypes. Thus, the human T-cell repertoire comprises a range of TCRs that can interact with "bulged" pHLA-I epitopes using unpredictable strategies, including the adoption of atypical footprints on the MHC-I.

    Organizational Affiliation: 

    Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, Clayton 3800, Australia.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MHC class I antigenA276Homo sapiensMutation(s): 0 
Gene Names: HLA-B
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UniProt GroupC5MK56
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinB99Homo sapiensMutation(s): 0 
Gene Names: B2M, CDABP0092, HDCMA22P
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Find proteins for P61769 (Homo sapiens)
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Trans-activator protein BZLF1C13Human gammaherpesvirus 4Mutation(s): 0 
Gene Names: BZLF1
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Find proteins for Q3KSS8 (Epstein-Barr virus (strain GD1))
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
CA5 TCR alpha chainD204Homo sapiensMutation(s): 0 
Gene Names: TRAC, TCRA
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Find proteins for P01848 (Homo sapiens)
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PHAROS:  P01848
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
CA5 TCR beta chainE238Homo sapiensMutation(s): 0 
Gene Names: TRBC1
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Find proteins for P01850 (Homo sapiens)
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UniProt GroupP01850
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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.205 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.1α = 90
b = 78.408β = 93.06
c = 105.339γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PHASERphasing
BUSTER-TNTrefinement
PDB_EXTRACTdata extraction
Blu-Icedata collection
XDSdata reduction
BUSTERrefinement

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-04-10
    Type: Initial release
  • Version 1.1: 2014-05-07
    Changes: Database references
  • Version 1.2: 2017-11-15
    Changes: Refinement description