The transporter associated with antigen processing TAP: structure and function

The transport of antigenic peptides from the cytosol to the lumen of the endoplasmic reticulum (ER) is an essential process for presentation to cytotoxic T‐lymphocytes. The transporter associated with antigen processing (TAP) is responsible for the intracellular translocation of peptides across the membrane of the ER. Efficient assembly of MHC‐peptide complex requires the formation of a macromolecular transport and chaperone complex composed of TAP, tapasin and MHC class I molecules. Therefore, structure and function of TAP is important for the understanding of the immune surveillance.

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