Antigen presenting cells (APC) have the ability to present both extra-cellular and intra-cellular antigens via MHC class I molecules to CD8(+) T cells. The cross presentation of extra-cellular antigens is reduced in mice with deficient Antigen Peptide Transporter 1 (TAP1)-dependent MHC class I antigen presentation, and these mice are characterized by a diminished CD8(+) T cell population. We ha...

BACKGROUND Autoimmunity has been implicated in the destruction of melanocytes from vitiligo skin. Major histocompatibility complex (MHC) class-II linked genes proteasome subunit beta 8 (PSMB8) and transporter associated with antigen processing 1 (TAP1), involved in antigen processing and presentation have been reported to be associated with several autoimmune diseases including vitiligo. OBJE...

The transporter associated with antigen processing (TAP), a member of the ATP binding cassette (ABC) family of transmembrane transporters, transports peptides across the endoplasmic reticulum membrane for assembly of major histocompatibility complex class I molecules. Two subunits, TAP1 and TAP2, are required for peptide transport, and ATP hydrolysis by TAP1.TAP2 complexes is important for tran...

BACKGROUND The transporter associated with antigen processing (TAP) consists of two polypeptides, TAP1 and TAP2. TAP delivers peptides into the ER and forms a "loading complex" with MHC class I molecules and accessory proteins. Our previous experiments indicated that nucleotide binding to TAP plays a critical role in the uptake of peptide and the release of assembled class I molecules. To inves...

Tumors deficient in expression of the transporter associated with antigen processing (TAP) usually fail to induce T-cell-mediated immunity and are resistant to T-cell lysis. However, we have found that introduction of the B7.1 gene into TAP-negative (TAP(-)) or TAP1-transfected (TAP1(+)) murine lung carcinoma CMT.64 cells can augment the capacity of the cells to induce a protective immune respo...

Firstly, our research group identified Sutai pigs' phenotypes that exhibited extreme resistance and susceptibility to the Escherichia coli F18 respectively, and then eight ETEC (Enterotoxigenic Escherichia coli) F18-resistant piglets and eight ETEC F18-sensitive piglets were selected. Then, the TAP1 (Transporter associated with antigen processing) mRNA relative expression levels were analyzed i...

Presentation of peptides derived from cytosolic and nuclear proteins by MHC class I molecules requires their translocation across the membrane of the endoplasmic reticulum (ER) by a specialized ABC (ATP-binding cassette) transporter, TAP. To investigate the topology of the heterodimeric TAP complex, we constructed a set of C-terminal deletions for the TAP1 and TAP2 subunits. We identified eight...

Transporter associated with Ag processing 1 and low molecular mass polypeptide 2 (LMP2) are essential for class I MHC function and share a common bidirectional promoter. In murine bone marrow-derived macrophages, LPS and TNFinduced Tap1 and up-regulated Lmp2, which is constitutively expressed at low levels. These two genes are induced by LPS and TNFwith distinct kinetics, at 6 and 12–24 h, resp...

The ATP-binding cassette (ABC) transporter TAP translocates peptides from the cytosol to awaiting MHC class I molecules in the endoplasmic reticulum. TAP is made up of the TAP1 and TAP2 polypeptides, which each possess a nucleotide binding domain (NBD). However, the role of ATP in peptide binding and translocation is poorly understood. We present biochemical and functional evidence that the NBD...

To explore the relationship between protein expression of antigen presentation related genes (TAP1, TAP2, LMP2, LMP7) and psoriasis their differences. Collect skin tissue samples from patients with normal people, was detected by immunohistochemistry SP method Western blotting, respectively. RT-PCR showed that there no significant difference in TAP1, TAP2 LMP2 healthy controls, LMP7 mRNA decreas...