UniProt Protein Function: | 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. |
NCBI Summary: | The membrane-associated protein encoded by this gene is a member of the superfamily of ATP-binding cassette (ABC) transporters. ABC proteins transport various molecules across extra- and intra-cellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White). This protein is a member of the MDR/TAP subfamily. Members of the MDR/TAP subfamily are involved in multidrug resistance. The protein encoded by this gene is involved in the pumping of degraded cytosolic peptides across the endoplasmic reticulum into the membrane-bound compartment where class I molecules assemble. Mutations in this gene may be associated with ankylosing spondylitis, insulin-dependent diabetes mellitus, and celiac disease. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2014] |
UniProt Code: | Q03518 |
NCBI GenInfo Identifier: | 215273957 |
NCBI Gene ID: | 6890 |
NCBI Accession: | Q03518.2 |
UniProt Secondary Accession: | Q03518,Q16149, Q96CP4, |
UniProt Related Accession: | Q03518 |
Molecular Weight: | 87,218 Da |
NCBI Full Name: | Antigen peptide transporter 1 |
NCBI Synonym Full Names: | transporter 1, ATP binding cassette subfamily B member |
NCBI Official Symbol: | TAP1 |
NCBI Official Synonym Symbols: | APT1; PSF1; ABC17; ABCB2; PSF-1; RING4; TAP1N; D6S114E; TAP1*0102N |
NCBI Protein Information: | antigen peptide transporter 1 |
UniProt Protein Name: | Antigen peptide transporter 1 |
UniProt Synonym Protein Names: | ATP-binding cassette sub-family B member 2; Peptide supply factor 1; Peptide transporter PSF1; PSF-1; Peptide transporter TAP1; Peptide transporter involved in antigen processing 1; Really interesting new gene 4 protein |
Protein Family: | Protein |
UniProt Gene Name: | TAP1 |
UniProt Entry Name: | TAP1_HUMAN |