Abstract
MAJOR histocompatibility complex (MHC) class I molecules present peptides from degraded intracellular antigens to CD8+ T cells1. These peptides are translocated in an ATP-dependent fashion2–4 into the lumen of the endoplasmic reticulum (ER) for binding to class I molecules5,6 by means of the MHC-encoded transporters associated with antigen processing, TAP1 and TAP2. These are members of a family of proteins containing an ATP-binding cassette and form heterodimers in the ER membrane7–10. Defects in the genes encoding TAP1 or TAP2 account for impaired class I assembly and antigen presentation in several human and rodent cell lines7,11–13. Whereas MHC class I molecules select peptides according to binding motifs14–17, it is not clear to what extent the TAP1–TAP2 transporters have peptide sequence and length specificity. Previous studies of the rat MHC class I molecule, RT1Aa, suggested a specific conveyance of peptides by rat TAP1–TAP2 (ref. 18). Here we substitute the amino- and carboxy-terminal and the penultimate amino-acid residues of model peptides to show that these residues influence the efficiency of transport. Human TAP and rat TAPa translocated peptides with hydrophobic and basic C termini, whereas mouse TAP and rat TAPu preferred peptides with hydrophobic C termini. This pattern correlates with the predominant peptide binding profiles of mouse and human class I molecules.
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Momburg, F., Roelse, J., Howard, J. et al. Selectivity of MHC-encoded peptide transporters from human, mouse and rat. Nature 367, 648–651 (1994). https://doi.org/10.1038/367648a0
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DOI: https://doi.org/10.1038/367648a0
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