Anti-TAP1 Antibody Picoband® Fluoro647 Conjugated

Transporter associated with Antigen Processing 1 is a protein that in humans is encoded by the TAP1 gene. 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. And 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.

Antigen peptide transporter 1; APT1; 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; TAP1; ABCB2, PSF1, RING4, Y3

A synthetic peptide corresponding to a sequence in the middle region of human TAP1, different from the related mouse sequence by eight amino acids, and from the related rat sequence by nine amino acids.

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.

1. Entrez Gene: TAP1 transporter 1, ATP-binding cassette, sub-family B (MDR/TAP) . 2. Bahram S, Arnold D, Bresnahan M, Strominger JL, Spies T (Dec 1991) . Two putative subunits of a peptide pump encoded in the human major histocompatibility complex class II region. Proc Natl Acad Sci U S A 88 (22) : 10094–8. 3. Bodmer JG, Marsh SG, Albert ED, Bodmer WF, Dupont B, Erlich HA, Mach B, Mayr WR, Parham P, Sasazuki T (Oct 1992) . Nomenclature for factors of the HLA system, 1991. WHO Nomenclature Committee for factors of the HLA system. Tissue Antigens 39 (4) : 161–73.