6RPB image
Entry Detail
PDB ID:
6RPB
Keywords:
Title:
Crystal structure of the T-cell receptor NYE_S1 bound to HLA A2*01-SLLMWITQV
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2019-05-14
Release Date:
2020-01-15
Method Details:
Experimental Method:
Resolution:
2.50 Å
R-Value Free:
0.27
R-Value Work:
0.24
R-Value Observed:
0.25
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:HLA class I histocompatibility antigen, A-2 alpha chain
Chain IDs:A, F, K, P
Chain Length:277
Number of Molecules:4
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Beta-2-microglobulin
Chain IDs:B, G, L, Q
Chain Length:100
Number of Molecules:4
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Heteroclitic NY-ESO-1 157-165 peptide
Chain IDs:C, H, M, R
Chain Length:9
Number of Molecules:4
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:T-cell receptor alpha chain
Chain IDs:D, I, N, S
Chain Length:206
Number of Molecules:4
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:T-cell receptor beta chain
Chain IDs:E, J, O, T
Chain Length:244
Number of Molecules:4
Biological Source:Homo sapiens
Primary Citation
TCRs with Distinct Specificity Profiles Use Different Binding Modes to Engage an Identical Peptide-HLA Complex.
J Immunol. 204 1943 1953 (2020)
PMID: 32102902 DOI: 10.4049/jimmunol.1900915

Abstact

The molecular rules driving TCR cross-reactivity are poorly understood and, consequently, it is unclear the extent to which TCRs targeting the same Ag recognize the same off-target peptides. We determined TCR-peptide-HLA crystal structures and, using a single-chain peptide-HLA phage library, we generated peptide specificity profiles for three newly identified human TCRs specific for the cancer testis Ag NY-ESO-1157-165-HLA-A2. Two TCRs engaged the same central peptide feature, although were more permissive at peripheral peptide positions and, accordingly, possessed partially overlapping peptide specificity profiles. The third TCR engaged a flipped peptide conformation, leading to the recognition of off-target peptides sharing little similarity with the cognate peptide. These data show that TCRs specific for a cognate peptide recognize discrete peptide repertoires and reconciles how an individual's limited TCR repertoire following negative selection in the thymus is able to recognize a vastly larger antigenic pool.

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Primary Citation of related structures