Primary Citation of Related Structures: 5SWS, 5SWZ
PubMed Abstract:
The anti-viral T cell response is drawn from the naive T cell repertoire. During influenza infection, the CD8 + T cell response to an H-2D b -restricted nucleoprotein epitope (NP 366 ) is characterized by preferential expansion of T cells bearing TRBV13 + T cell receptors (TCRs) and avoidance of TRBV17 + T cells, despite the latter dominating the naive precursor repertoire ...
The anti-viral T cell response is drawn from the naive T cell repertoire. During influenza infection, the CD8 + T cell response to an H-2D b -restricted nucleoprotein epitope (NP 366 ) is characterized by preferential expansion of T cells bearing TRBV13 + T cell receptors (TCRs) and avoidance of TRBV17 + T cells, despite the latter dominating the naive precursor repertoire. We found two TRBV17 + TCRs that bound H-2D b -NP 366 with a 180° reversed polarity compared to the canonical TCR-pMHC-I docking. The TRBV17 β-chain dominated the interaction and, whereas the complementarity determining region-3 (CDR3) loops exclusively mediated contacts with the MHC-I, peptide specificity was attributable to germline-encoded recognition. Nevertheless, the TRBV17 + TCR exhibited moderate affinity toward H-2D b -NP 366 and was capable of signal transduction. Thus, the naive CD8 + T cell pool can comprise TCRs adopting reversed pMHC-I docking modes that limit their involvement in the immune response.
Organizational Affiliation:
Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia; Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Parkville, VIC 3010, Australia. Electronic address: nicole.la.gruta@monash.edu.
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