Use of Functional Polymorphisms To Elucidate the Peptide Binding Site of TAP Complexes

The Journal of Immunology : Official Journal of the American Association of Immunologists
Jie GengM Raghavan

Abstract

TAP1/TAP2 complexes translocate peptides from the cytosol to the endoplasmic reticulum lumen to enable immune surveillance by CD8(+) T cells. Peptide transport is preceded by peptide binding to a cytosol-accessible surface of TAP1/TAP2 complexes, but the location of the TAP peptide-binding pocket remains unknown. Guided by the known contributions of polymorphic TAP variants to peptide selection, we combined homology modeling of TAP with experimental measurements to identify several TAP residues that interact with peptides. Models for peptide-TAP complexes were generated, which indicate bent conformation for peptides. The peptide binding site of TAP is located at the hydrophobic boundary of the cytosolic membrane leaflet, with striking parallels to the glutathione binding site of NaAtm1, a transporter that functions in bacterial heavy metal detoxification. These studies illustrate the conservation of the ligand recognition modes of bacterial and mammalians transporters involved in peptide-guided cellular surveillance.

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Citations

Oct 18, 2016·Journal of the American Chemical Society·Elisa LehnertRobert Tampé
Aug 28, 2019·Nature Structural & Molecular Biology·Sriram Srikant, Rachelle Gaudet
Feb 15, 2017·Frontiers in Immunology·Elisa Lehnert, Robert Tampé
May 16, 2018·Frontiers in Cell and Developmental Biology·Rupert Abele, Robert Tampé
Nov 5, 2020·FEBS Letters·Sriram Srikant

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