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用途:
For Research Use Only. Not for use in diagnostic or therapeutic procedures.
ABC transporter associated with antigen processing. In complex with TAP1 mediates unidirectional translocation of peptide antigens from cytosol to endoplasmic reticulum (ER) for loading onto MHC class I (MHCI) molecules. Uses the chemical energy of ATP to export peptides against the concentration gradient. During the transport cycle alternates between 'inward-facing' state with peptide binding site facing the cytosol to 'outward-facing' state with peptide binding site facing the ER lumen. Peptide antigen binding to ATP-loaded TAP1-TAP2 induces a switch to hydrolysis-competent 'outward-facing' conformation ready for peptide loading onto nascent MHCI molecules. Subsequently ATP hydrolysis resets the transporter to the 'inward facing' state for a new cycle. Typically transports intracellular peptide antigens of 8 to 13 amino acids that arise from cytosolic proteolysis via IFNG-induced immunoproteasome. Binds peptides with free N- and C-termini, the first three and the C-terminal residues being critical. Preferentially selects peptides having a highly hydrophobic residue at position 3 and hydrophobic or charged residues at the C-terminal anchor. Proline at position 2 has the most destabilizing effect. As a component of the peptide loading complex (PLC), acts as a molecular scaffold essential for peptide-MHCI assembly and antigen presentation.
基因功能參考文獻:
Our findings support the hypothesis that hsa-miR-1270 suppresses the production of TAP2 by binding to this SNP in the 3'-UTR of this gene PMID: 29205500
The present study illustrated that the carriage of LMP7 rs2071543-AA and TAP2 rs1800454-AA had a negative effect on treatment response to pegIFN-alpha/RBV among genotype 1 patient with chronic hepatitis C (CHC) in a Chinese Han population PMID: 29039469
We replicated the association between the rs2071473 genotype and TAP2 expression by using GTEx data and demonstrated that TAP2 is expressed by decidual stromal cells at the maternal-fetal interface. PMID: 27745831
Two eSNPs were associated with fecundability at a FDR of 5%; both were in the HLA region and were eQTLs for the TAP2 gene (P = 1.3x10-4) and the HLA-F gene (P = 4.0x10-4), respectively. PMID: 27447835
These results suggest that TAP2 polymorphisms influence TB susceptibility in a Japanese population. PMID: 27325005
Deletions of ABCB3 predict good tumor response to neoadjuvant chemotherapy in breast cancer. PMID: 26799285
TAP/TPN complex formation is driven by hydrophobic interactions via leucine zipper-like motifs. PMID: 26519531
TAP2, HLA-DOA, HLA-DOB, and tapasin loci are novel candidate regions for susceptibility to HCV infection and viral clearance in the Chinese population PMID: 25874709
We showed that TAP2 gene has an association with pulmonary tuberculosis in Koreans. PMID: 25846714
Our meta-analyses suggested that TAP2-379Ile allele was significantly associated with a 59% increased risk for rheumatoid arthritis PMID: 24972609
Results suggested an association between TAP2-565 polymorphism and chronic lymphoid leukemia (CLL). TAP2-665 GG genotype might be a risk factor for CLL, chronic myeloblastic leukemia, and multiple myeloma. PMID: 24175803
Three tapasin binding sites on TAP have been described, two of which are located in the N-terminal domains of TAP1 and TAP2. PMID: 24501197
Although lung cancer cells bearing the preprocalcitonin ppCT(16-25) epitope display low levels of TAP, restoration of TAP expression inhibits ppCT antigen presentation. PMID: 23302073
the N-terminal region of Snm1B forms a complex containing PSF2 and Mus81, while the C-terminal region is important for PSF2-mediated chromatin association. PMID: 23189151
Genetic variation in TAP2 was associated with NHL risk overall, and follicular lymphoma risk in particular, and this was independent of other established loci from 6p21.3. PMID: 22911334
the N-terminal extension of the TAP2 subunit represents an autonomous domain, which is correctly targeted to and inserted into the endoplasmic reticulum membrane PMID: 22638925
Comparison of unpaired 50 primary breast cancer and 33 brain metastases showed lower expression of beta2-microglobulin, transporter associated with antigen processing (TAP) 1, TAP2 and calnexin in the brain lesions. PMID: 22065046
Regression analysis revealed that polymorphisms and haplotypes of TAP2 were associated with FEV1 decline by aspirin provocation (P=0.002-0.04) in most of minor homozygotes compared with major homozygotes and AERD development. PMID: 21796142
genetic polymorphism is associated with end stage renal disease in patients of North India PMID: 21440064
Single cysteine residue within the antigen translocation complex TAP controls the epitope repertoire by stabilizing a receptive conformation. PMID: 20439763
The higher frequency of HLA class I antigen and TAP down-regulation in metastases play a role in the clinical course of the disease. PMID: 20204276
TAP-impaired HLA class I expression could influence the course of SCC originating in chronic ulcers and could be related to escape from cytotoxic T-lymphocyte surveillance during disease progression. PMID: 20083708
Analysis of TAP2 polymorphisms in Finnish individuals with type I diabetes. PMID: 11916171
There was a significant difference in the frequencies at position 665 of TAP 2 gene. TAP genes might have modifying effects on the cystic fibrosis phenotype. PMID: 12026214
TAP2*Bky2 or its haplotype with DRB1*08032 may be involved in SS-A/Ro antibody production not only in SS but also SLE, indicating that TAP2*Bky2 may be a susceptible gene not only to the disease of SS but also to the SS-A/Ro autoantibody production. PMID: 12729048
Expression of TAP2 is not identical to TAP1 in primary melanoma lesions. PMID: 12777979
this allele is preferentially associated with the large conserved haplotype HLA DQA1*0501-DQB1*0201-DRB1*0301 and restricted to populations of African origin PMID: 12786999
detected the presence of 17 nucleotide sequence variations in the entire coding region of TAP2 in an indigenous Zimbabwean population (Shona ethnic group) PMID: 12826376
TAP2 gene polymorphism is not linked to renal cell carcinoma PMID: 12963978
The results of this study provide genetic evidence that TAP2 gene codon 565 polymorphism may play a role in rheumatoid arthritis. PMID: 14749980
Evidence is provided that that the extended haplotype of TAP2 is distinct in pauciarticular and polyarticular rheumatoid factor negative juvenile idiopathic arthritis patients. PMID: 15343265
TAP1-2 gene polymorphisms may, by way of post-transcriptional changes and altered regulation of gene expression, be involve the immune system in the development of primary open-angle glaucoma PMID: 15887980
Transmembrane segment 1 (TM1) of core-TAP2 is critical for its heterodimerization with core-TAP1. PMID: 16061226
Results suggest the possible role of TAP2 gene polymorphism in the genetic susceptibility to systemic sclerosis . PMID: 16112028
TAP variants lacking TAP2 N-terminal domain build peptide-loading complexes (PLC) that fail to generate stable MHC I-peptide complexes, which correlates with a substantially reduced recruitment of accessory chaperones into the PLC PMID: 16210614
The TAP2-2 MspI polymorphism might be associated with calcium stone disease. PMID: 16215317
Several TAP gene polymorphisms were examined and a TAP2 SNP (rs241448) associated with AD found in two independent case-control samples, especially in carriers of the APOE4 allele. PMID: 16595160
Two Pemphigus vulgaris (PV) TAP2 risk alleles were identified (TAP2*C and TAP2*D) implying that TAP2 genes are involved in susceptibility to development of PV. PMID: 16690408
These data reveal that the single-site polymorphism of the TAP2 gene at codon 665 may be an indicator for predicting Graves Disease development. PMID: 16721835
The main active site required for peptide translocation by TAP1-TAP2 complexes resides at the TAP2 nucleotide binding site. PMID: 17068338
Evidence of TAP2 association with type 1 diabetes that is independent of HLA DR-DQ may be based on allele dependence of splicing into isoforms known to have differential peptide selectivities. PMID: 17192492
TAP2-651 site is associated with the risk of HBV infection PMID: 17525827
First report on the role of TAP2 polymorphisms involved in the diverse pathogenesis of dengue virus infection. PMID: 18071882
Allele 665 is associated with cervical cancer, but this is strongly influenced by linkage disequilibrium with human leukocyte antigen DQB1. PMID: 18650831
Downregulation of TAP2 is associated with acute myeloid leukaemic blasts. PMID: 19148137
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相關疾病:
Bare lymphocyte syndrome 1 (BLS1)
亞細胞定位:
Endoplasmic reticulum membrane; Multi-pass membrane protein. Note=The transmembrane segments seem to form a pore in the membrane.