The MHC class I-related protein 1 (MR1) presents specific small molecule antigens to MR1-restricted T (MR1T) lymphocytes. These cells play an important role in infection and cancer, and strategies to target these cells are of considerable therapeutic interest. In this Review, McWilliam and Villadangos provide a comprehensive description of the antigen presentation pathway of MR1, which is fundamental for the understanding of MR1-mediated immunity and the potential therapeutic manipulation of MR1T cells.
- Hamish E. G. McWilliam
- Jose A. Villadangos