6NCA

HLA-A2 (A*02:01) bound to a peptide from the Epstein-Barr virus BRLF1 protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.285 
  • R-Value Observed: 0.285 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

CDR3 alpha drives selection of the immunodominant Epstein Barr virus (EBV) BRLF1-specific CD8 T cell receptor repertoire in primary infection.

Kamga, L.Gil, A.Song, I.Brody, R.Ghersi, D.Aslan, N.Stern, L.J.Selin, L.K.Luzuriaga, K.

(2019) PLoS Pathog 15: e1008122-e1008122

  • DOI: 10.1371/journal.ppat.1008122
  • Primary Citation of Related Structures:  
    6NCA

  • PubMed Abstract: 
  • The T cell receptor (TCR) repertoire is an essential component of the CD8 T-cell immune response. Here, we seek to investigate factors that drive selection of TCR repertoires specific to the HLA-A2-restricted immunodominant epitope BRLF1109-117 (YVLD ...

    The T cell receptor (TCR) repertoire is an essential component of the CD8 T-cell immune response. Here, we seek to investigate factors that drive selection of TCR repertoires specific to the HLA-A2-restricted immunodominant epitope BRLF1109-117 (YVLDHLIVV) over the course of primary Epstein Barr virus (EBV) infection. Using single-cell paired TCRαβ sequencing of tetramer sorted CD8 T cells ex vivo, we show at the clonal level that recognition of the HLA-A2-restricted BRLF1 (YVL-BR, BRLF-1109) epitope is mainly driven by the TCRα chain. For the first time, we identify a CDR3α (complementarity determining region 3 α) motif, KDTDKL, resulting from an obligate AV8.1-AJ34 pairing that was shared by all four individuals studied. This observation coupled with the fact that this public AV8.1-KDTDKL-AJ34 TCR pairs with multiple different TCRβ chains within the same donor (median 4; range: 1-9), suggests that there are some unique structural features of the interaction between the YVL-BR/MHC and the AV8.1-KDTDKL-AJ34 TCR that leads to this high level of selection. Newly developed TCR motif algorithms identified a lysine at position 1 of the CDR3α motif that is highly conserved and likely important for antigen recognition. Crystal structure analysis of the YVL-BR/HLA-A2 complex revealed that the MHC-bound peptide bulges at position 4, exposing a negatively charged aspartic acid that may interact with the positively charged lysine of CDR3α. TCR cloning and site-directed mutagenesis of the CDR3α lysine ablated YVL-BR-tetramer staining and substantially reduced CD69 upregulation on TCR mutant-transduced cells following antigen-specific stimulation. Reduced activation of T cells expressing this CDR3 motif was also observed following exposure to mutated (D4A) peptide. In summary, we show that a highly public TCR repertoire to an immunodominant epitope of a common human virus is almost completely selected on the basis of CDR3α and provide a likely structural basis for the selection. These studies emphasize the importance of examining TCRα, as well as TCRβ, in understanding the CD8 T cell receptor repertoire.


    Organizational Affiliation

    Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America.



Macromolecules
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Replication and transcription activator12345678UVWXYZuvwxyz9Human gammaherpesvirus 4Mutation(s): 0 
Gene Names: BRLF1
Find proteins for Q3KSS7 (Epstein-Barr virus (strain GD1))
Explore Q3KSS7 
Go to UniProtKB:  Q3KSS7
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class I histocompatibility antigen, A-2 alpha chainABCDEFGHIJKLMNOPQRST275Homo 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
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinabcdefghijklmnopqrst100Homo sapiensMutation(s): 0 
Gene Names: B2MCDABP0092HDCMA22P
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
NIH Common Fund Data Resources
PHAROS  P61769
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.285 
  • R-Value Observed: 0.285 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 189.91α = 90
b = 100.17β = 94.43
c = 292.41γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)United StatesAI-49320
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)United StatesAI-046629
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)United StatesAI-109858
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)United StatesAI038996
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesT32-AI-007349-17

Revision History 

  • Version 1.0: 2019-10-23
    Type: Initial release
  • Version 1.1: 2019-12-18
    Changes: Author supporting evidence
  • Version 1.2: 2020-01-29
    Changes: Database references