Which peptides are selected for presentation by major histocompatibility complex class-I (MHC-I) molecules is a key determinant of successful immune responses. Peptide selection is co-ordinated by the tapasin and TAP Binding PRotein (TAPBPR) proteins, which ensure MHC-I molecules preferentially acquire high-affinity-binding peptides. New structural analyses have offered insight into how tapasin achieves this function within the peptide-loading complex (PLC) (comprising the Transporter associated with Antigen Presentation (TAP) peptide transporter, tapasin-ERp57, MHC-I and calreticulin), and how TAPBPR performs a peptide editing function independently of other molecules. The new structures reveal nuances in how tapasin and TAPBPR interact with MHC-I, and how calreticulin and ERp57 complement tapasin to exploit the plasticity of MHC-I molecules to achieve peptide editing.
Journal article
2023-08-01T00:00:00+00:00
83
Institute for Life Sciences and Centre for Cancer Immunology, Faculty of Medicine, University of Southampton, Building 85, Southampton SO17 1BJ, UK.
Humans, Peptides, Immunoglobulins, Carrier Proteins, Calreticulin, Membrane Transport Proteins, Histocompatibility Antigens Class I, HLA Antigens, Antigen Presentation, Major Histocompatibility Complex