3HG1 image
Entry Detail
PDB ID:
3HG1
Keywords:
Title:
Germline-governed recognition of a cancer epitope by an immunodominant human T cell receptor
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2009-05-13
Release Date:
2009-07-28
Method Details:
Experimental Method:
Resolution:
3.00 Å
R-Value Free:
0.30
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 43
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:MHC class I antigen
Chain IDs:A
Chain Length:276
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Beta-2-microglobulin
Chain IDs:B
Chain Length:100
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:CANCER/MART-1
Chain IDs:C
Chain Length:10
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:T-CELL RECEPTOR, ALPHA CHAIN
Chain IDs:D
Chain Length:194
Number of Molecules:1
Biological Source:HOMO SAPIENS
Polymer Type:polypeptide(L)
Description:T-cell Receptor, Beta Chain
Chain IDs:E
Chain Length:244
Number of Molecules:1
Biological Source:HOMO SAPIENS
Primary Citation
Germ line-governed recognition of a cancer epitope by an immunodominant human T-cell receptor.
J.Biol.Chem. 284 27281 27289 (2009)
PMID: 19605354 DOI: 10.1074/jbc.M109.022509

Abstact

CD8(+) T-cells specific for MART-1-(26-35), a dominant melanoma epitope restricted by human leukocyte antigen (HLA)-A*0201, are exceptionally common in the naive T-cell repertoire. Remarkably, the TRAV12-2 gene is used to encode the T-cell receptor alpha (TCRalpha) chain in >87% of these T-cells. Here, the molecular basis for this genetic bias is revealed from the structural and thermodynamic properties of an archetypal TRAV12-2-encoded TCR complexed to the clinically relevant heteroclitic peptide, ELAGIGILTV, bound to HLA-A*0201 (A2-ELA). Unusually, the TRAV12-2 germ line-encoded regions of the TCR dominate the major atomic contacts with the peptide at the TCR/A2-ELA interface. This "innate" pattern of antigen recognition probably explains the unique characteristics and extraordinary frequencies of CD8(+) T-cell responses to this epitope.

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Primary Citation of related structures