Download MendeleyMolecular basis underpinning MR1 allomorph recognition by an MR1-restricted T cell receptor.
Suckling, R.J., Pamukcu, C., Simmons, R.A., Fonseca, D., Grant, E., Harrison, R., Shaikh, S.A., Khanolkar, R.C., Ghadbane, H., Creese, A., Hock, M., Gligoris, T.G., Lepore, M., Karuppiah, V., Salio, M.(2025) Front Immunol 16: 1547664-1547664
- PubMed: 40207221
- DOI: https://doi.org/10.3389/fimmu.2025.1547664
- Primary Citation of Related Structures:
9HI7 - PubMed Abstract:
The MHC-class-I-related molecule MR1 presents small metabolites of microbial and self-origin to T cells bearing semi-invariant or variant T cell receptors. One such T cell receptor, MC.7.G5, was previously shown to confer broad MR1-restricted reactivity to tumor cells but not normal cells, sparking interest in the development of non-MHC-restricted immunotherapy approaches. Here we provide cellular, biophysical, and crystallographic evidence that the MC.7.G5 TCR does not have pan-cancer specificity but is restricted to a rare allomorph of MR1, bearing the R9H mutation. Our results underscore the importance of in-depth characterization of MR1-reactive TCRs against targets expressing the full repertoire of MR1 allomorphs.
- Immunocore Ltd., Abingdon, United Kingdom.
Organizational Affiliation:
