Title |
Germ Line-governed Recognition of a Cancer Epitope by an Immunodominant Human T-cell Receptor*
|
---|---|
Published in |
Journal of Biological Chemistry, July 2009
|
DOI | 10.1074/jbc.m109.022509 |
Pubmed ID | |
Authors |
David K. Cole, Fang Yuan, Pierre J. Rizkallah, John J. Miles, Emma Gostick, David A. Price, George F. Gao, Bent K. Jakobsen, Andrew K. Sewell |
Abstract |
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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