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MHC class I antigen presentation refers to the co-ordinated activities of many intracellular pathways that promote the cell surface appearance of MHC class I/beta2m heterodimers loaded with a spectrum of self or foreign peptides. These MHC class I peptide complexes form ligands for CD8 positive T cells and NK cells. MHC class I heterodimers are loaded within the endoplasmic reticulum (ER) with peptides derived from intracellular proteins. Alternatively, MHC class I molecules may be loaded with peptides derived from extracellular proteins in a process called MHC class I cross presentation. This pathway is less well defined but can overlap those pathways operating in classical MHC class I presentation and has recently been reviewed elsewhere (1). This review will address the current concepts regarding the intracellular assembly of MHC class I molecules with their peptide cargo within the ER and their subsequent progress to the cell surface.

Original publication




Journal article


Tissue antigens

Publication Date





3 - 17


Cancer Sciences Division, University of Southampton School of Medicine, UK.


Humans, Isomerases, Immunoglobulins, Calcium-Binding Proteins, Calnexin, Calreticulin, Membrane Transport Proteins, Antiporters, Ribonucleoproteins, Heat-Shock Proteins, Receptors, Cell Surface, Molecular Chaperones, Histocompatibility Antigens Class I, Antigen Presentation, Protein Structure, Tertiary, Biological Transport, Models, Immunological, Protein Disulfide-Isomerases