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Involved in the transport of antigens from the cytoplasm to the endoplasmic reticulum for association with MHC class I molecules. Also acts as a molecular scaffold for the final stage of MHC class I folding, namely the binding of peptide. Nascent MHC class I molecules associate with TAP via tapasin. Inhibited by the covalent attachment of herpes simplex virus ICP47 protein, which blocks the peptide-binding site of TAP. Inhibited by human cytomegalovirus US6 glycoprotein, which binds to the lumenal side of the TAP complex and inhibits peptide translocation by specifically blocking ATP-binding to TAP1 and prevents the conformational rearrangement of TAP induced by peptide binding. Inhibited by human adenovirus E3-19K glycoprotein, which binds the TAP complex and acts as a tapasin inhibitor, preventing MHC class I/TAP association. Expression of TAP1 is down-regulated by human Epstein-Barr virus vIL-10 protein, thereby affecting the transport of peptides into the endoplasmic reticulum and subsequent peptide loading by MHC class I molecules.
Gene Name: | transporter 1, ATP-binding cassette, sub-family B (MDR/TAP) |
Family/Subfamily: | Transporter , ATP-binding cassette - ABCB/MDR |
Synonyms: | TAP1, ABC17, ABCB2, APT1, D6S114E, ABC transporter, MHC 1, Ham1, Peptide transporter TAP1, PSF1, TAP1N, MTP1, Peptide transporter PSF1, PSF-1, Peptide supply factor 1, RING4, Y3 |
Target Sequences: | NM_000593 NP_000584.2 Q03518 |
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