Search results for "Transporter associated with antigen processing"

showing 10 items of 19 documents

Deficient expression of components of the MHC class I antigen processing machinery in human cervical carcinoma.

2001

In cervical carcinomas abnormalities in the MHC class I surface expression are a frequent event, which are often associated with the deficient expression of the peptide transporter subunit TAP1 thereby resulting in impaired T cell response. In order to understand the role of other components of the MHC class I antigen processing machinery (APM) in the immune escape, 16 surgically removed primary cervical carcinoma lesions were analyzed for their mRNA expression of the heterodimeric peptide transporter TAP, the constitutive and interferon (IFN)-gamma inducible proteasome subunits and their activators PA28alpha/beta, various chaperones as well as MHC class I antigens. High expression levels o…

Cancer ResearchAntigen presentationBlotting WesternDown-RegulationGene ExpressionGenes MHC Class IUterine Cervical NeoplasmsHuman leukocyte antigenBiologyInterferon-gammaInterferonMHC class ImedicineBiomarkers TumorTumor Cells CulturedHumansRNA MessengerCells CulturedDNA PrimersAntigen PresentationAntigen processingMHC class I antigenReverse Transcriptase Polymerase Chain ReactionHistocompatibility Antigens Class ITransporter associated with antigen processingNeoplasm ProteinsPhenotypeOncologyImmunologyCancer researchbiology.proteinFemaleTAP1medicine.drugInternational journal of oncology
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HLA class I antigen abnormalities and immune escape by malignant cells

2002

Abbreviations used in this paper: APM, antigen processing machinery; β2m,β2 microglobulin; bp, base pair; CTL, cytotoxic T lymphocytes; ER, endoplasmic reticulum; HC, heavy chain; HNSCC, head and neck squamous cell carcinoma; IFN, interferon; IL, interleukin; KIR, killing inhibitory receptors; LMP, low molecular weight proteins; LOH, loss of heterozygosity; mAb, monoclonal antibody; MHC, major histocompatibility complex; NK, natural killer; PA, proteasome activator; PCR, polymerase chain reaction; RCC, renal cell carcinoma; SCLC, small cell-lung carcinoma; TAA, tumor-associated antigens; TAP, transporter associated with antigen processing; TCR, T cell receptor; TNF, tumor necrosis factor; w…

Cancer ResearchAntigen processingHistocompatibility Antigens Class IAntigen presentationT-cell receptorTransporter associated with antigen processingBiologyMajor histocompatibility complexAntigenInterferonNeoplasmsCancer researchmedicinebiology.proteinHumansCytotoxic T cellmedicine.drugSeminars in Cancer Biology
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Impaired Transporter Associated with Antigen Processing (TAP) Function Attributable to a Single Amino Acid Alteration in the Peptide TAP Subunit TAP1

2003

Abstract The heterodimeric peptide transporter TAP belongs to the ABC transporter family. Sequence comparisons with the P-glycoprotein and cystic fibrosis transmembrane conductance regulator and the functional properties of selective amino acids in these ABC transporters postulated that the glutamic acid at position 263 and the phenylalanine at position 265 of the TAP1 subunit could affect peptide transporter function. To define the role of both amino acids, TAP1 mutants containing a deletion or a substitution to alanine at position 263 or 265 were generated and stably expressed in murine and human TAP1−/− cells. The different TAP1 mutants were characterized in terms of expression and funct…

Cytotoxicity ImmunologicMacromolecular SubstancesPhenylalanineImmunologyAntigen presentationGlutamic AcidATP-binding cassette transporterEndoplasmic ReticulumTransfectionCell LineMiceAdenosine TriphosphateATP Binding Cassette Transporter Subfamily B Member 3MHC class IAnimalsHumansImmunology and AllergyATP Binding Cassette Transporter Subfamily B Member 2Sequence DeletionAlaninechemistry.chemical_classificationAntigen PresentationbiologyHistocompatibility Antigens Class I3T3 CellsIntracellular MembranesTransporter associated with antigen processingMolecular biologyPeptide FragmentsCystic fibrosis transmembrane conductance regulatorAmino acidMice Inbred C57BLProtein SubunitsAmino Acid SubstitutionBiochemistrychemistryMutagenesis Site-Directedbiology.proteinATP-Binding Cassette TransportersTAP1Sequence AlignmentProtein BindingT-Lymphocytes CytotoxicThe Journal of Immunology
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Human cytomegalovirus US3 modulates destruction of MHC class I molecules

2012

Human cytomegalovirus (HCMV), a member of the Herpesviridae family, is proficient at establishing lifelong persistence within the host in part due to immune modulating genes that limit immune recognition. HCMV encodes at least five glycoproteins within its unique short (US) genomic region that interfere with MHC class I antigen presentation, thus hindering viral clearance by cytotoxic T lymphocytes (CTL). Specifically, US3 retains class I within the endoplasmic reticulum (ER), while US2 and US11 induce class I heavy chain destruction. A cooperative effect on class I down-regulation during stable expression of HCMV US2 and US3 has been established. To address the impact of US3 on US11-mediat…

Genes ViralAntigen processingMHC class I antigenvirusesHistocompatibility Antigens Class IImmunologyAntigen presentationCD1CytomegalovirusFluorescent Antibody TechniqueTransporter associated with antigen processingBiologyMajor histocompatibility complexVirologyArticleCell LineViral ProteinsMHC class Ibiology.proteinHumansCytotoxic T cellMolecular BiologyMolecular Immunology
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Identification of sequences in the human peptide transporter subunit TAP1 required for transporter associated with antigen processing (TAP) function

2001

The heterodimeric peptide transporter associated with antigen processing (TAP) consisting of the subunits TAP1 and TAP2 mediates the transport of cytosolic peptides into the lumen of the endoplasmic reticulum (ER). In order to accurately define domains required for peptide transporter function, a molecular approach based on the construction of a panel of human TAP1 mutants and their expression in TAP1(-/-) cells was employed. The characteristics and biological activity of the various TAP1 mutants were determined, and compared to that of wild-type TAP1 and TAP1(-/-) control cells. All mutant TAP1 proteins were localized in the ER and were capable of forming complexes with the TAP2 subunit. H…

Genetic VectorsImmunologyAntigen presentationBiological Transport ActiveEpitopes T-LymphocyteTransfectionMajor histocompatibility complexMiceAntigenATP Binding Cassette Transporter Subfamily B Member 3MHC class ITumor Cells CulturedAnimalsHumansLymphocytic choriomeningitis virusImmunology and AllergyAmino Acid SequenceATP Binding Cassette Transporter Subfamily B Member 2Sequence DeletionMice KnockoutAntigen PresentationbiologyAntigen processingHistocompatibility Antigens Class IGeneral MedicineTransporter associated with antigen processingMHC restrictionCytotoxicity Tests ImmunologicMolecular biologyPeptide FragmentsCell biologyMice Inbred C57BLPeptide transportMutagenesis Site-Directedbiology.proteinATP-Binding Cassette TransportersDimerizationT-Lymphocytes CytotoxicInternational Immunology
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TAP-polymorphisms in juvenile onset psoriasis and psoriatic arthritis.

1996

Abstract Juvenile onset psoriasis is strongly associated with the HLA-class I genes Cw6 and B57 whereas patients with psoriatic arthritis show an increased frequency of HLA-B27. It is unclear whether additional major histocompatibility genes also increase disease susceptibility. The TAP genes (transporter associated with antigen processing) encode two membrane-spanning proteins that translocate antigenic peptides from the cytoplasm into the endoplasmic reticulum. Comparison of 60 patients with juvenile onset psoriasis, 63 psoriatic arthritis patients, and 101 caucasoid controls revealed an increase of the TAP1 ∗ 0101 allele in the psoriasis group, that could not be explained by linkage to o…

ImmunologyLinkage DisequilibriumMajor Histocompatibility ComplexPsoriatic arthritisATP Binding Cassette Transporter Subfamily B Member 3PsoriasismedicineImmunology and AllergyHumansPsoriasisAlleleATP Binding Cassette Transporter Subfamily B Member 2GenePolymorphism Geneticbiologybusiness.industryEndoplasmic reticulumArthritis PsoriaticHistocompatibility Antigens Class IGeneral MedicineTransporter associated with antigen processingHLA-DR Antigensmedicine.diseaseImmunologybiology.proteinTAP2ATP-Binding Cassette TransportersTAP1businessHuman immunology
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Analysis of the structural integrity of the TAP2 gene in renal cell carcinoma.

2003

The transporter associated with antigen processing (TAP) gene products is involved in the processing of endogenous peptides that bind to MHC class I molecules. Mutations and/or polymorphism within these genes could alter the efficacy of the immune response which might be relevant for the development of autoimmune diseases and cancer. In this study we examined both the structural integrity and the polymorphism of TAP2 in renal cell carcinoma lesions by sequencing TAP2 in renal cell carcinoma lesions and autologous normal kidney epithelium. TAP2 sequence analysis of 31 renal cell carcinoma lesions, one oncocytoma and respective autologous normal kidney epithelium revealed no mutation in the T…

MaleCancer ResearchPathologymedicine.medical_specialtyHeterozygoteBiologyKidneyEpitheliumLoss of heterozygosityRenal cell carcinomaATP Binding Cassette Transporter Subfamily B Member 3GenotypeCarcinomamedicineHumansCarcinoma Renal CellAllelesAgedAged 80 and overKidneyPolymorphism GeneticReverse Transcriptase Polymerase Chain ReactionHomozygoteTransporter associated with antigen processingDNADNA Restriction EnzymesMiddle Agedmedicine.diseaseMolecular biologyKidney Neoplasmsmedicine.anatomical_structureOncologyMutationbiology.proteinTAP2RNAATP-Binding Cassette TransportersFemaleGene polymorphismPeptidesInternational journal of oncology
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Functional cysteine-less subunits of the transporter associated with antigen processing (TAP1 and TAP2) by de novo gene assembly

2002

AbstractWithin the adaptive immune system the transporter associated with antigen processing (TAP) plays a pivotal role in loading of peptides onto major histocompatibility (MHC) class I molecules. As a central tool to investigate the structure and function of the TAP complex, we created cysteine-less human TAP subunits by de novo gene synthesis, replacing all 19 cysteines in TAP1 and TAP2. After expression in TAP-deficient human fibroblasts, cysteine-less TAP1 and TAP2 are functional with respect to adenosine triphosphate (ATP)-dependent peptide transport and inhibition by ICP47 from herpes simplex virus. Cysteine-less TAP1 and TAP2 restore maturation and intracellular trafficking of MHC c…

Models MolecularBiophysicsBiological Transport ActiveBiologyMajor histocompatibility complexTransfectionBiochemistryCell Linechemistry.chemical_compoundAdenosine TriphosphateStructural BiologyATP Binding Cassette Transporter Subfamily B Member 3Cysteine-scanning mutagenesisMHC class IGeneticsHumansCysteineATP Binding Cassette Transporter Subfamily B Member 2Molecular BiologyAntigen PresentationAntigen processingHistocompatibility Antigens Class ICell BiologyTransporter associated with antigen processingMolecular biologyRecombinant ProteinsCell biologyProtein SubunitschemistryAmino Acid SubstitutionAntigen processingPeptide transportMembrane proteinbiology.proteinAdenosine triphosphate-binding cassette transporterTAP2ATP-Binding Cassette TransportersTAP1Adenosine triphosphateFEBS Letters
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Analysis of the MHC Class I Antigen Presentation Machinery in Human Embryonal Carcinomas: Evidence for Deficiencies in TAP, LMP and MHC Class I Expre…

1998

The expression of the major histocompatibility complex (MHC) class I antigens is suppressed in early post-implantation embryonic cells as well as in embryonal carcinoma (EC) cells, but could be upregulated by treatment with interferon (IFN)-gamma or retinoic acid. In a number of human and murine tumours, defects in the expression of the different components of the MHC class I antigen processing machinery, such as the proteasomal subunits LMP-2 and LMP-7 and the peptide transporters TAP-1 and TAP-2, account for impaired MHC class I surface expression. Here, we analysed the constitutive and IFN-gamma regulated mRNA and protein expression of the LMP, TAP and MHC class I molecules in the human …

Proteasome Endopeptidase ComplexCD74HIV AntigensImmunologyCD1CytomegalovirusInterferon-gammaATP Binding Cassette Transporter Subfamily B Member 3Multienzyme ComplexesCarcinoma EmbryonalMHC class ITumor Cells CulturedHumansATP Binding Cassette Transporter Subfamily B Member 2Antigens ViralAntigen PresentationbiologyAntigen processingMHC class I antigenHistocompatibility Antigens Class ITemperatureGeneral MedicineTransporter associated with antigen processingMHC restrictionMolecular biologyUp-RegulationCysteine EndopeptidasesProtein Biosynthesisbiology.proteinATP-Binding Cassette TransportersPeptidesCD8Scandinavian Journal of Immunology
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Bipartite regulation of different components of the MHC class I antigen-processing machinery during dendritic cell maturation

2001

Dendritic cells (DC) are professional antigen-presenting cells (APC) which proceed from immature to a mature stage during their final differentiation. Immature DC are highly effective in terms of antigen uptake and processing, whereas mature DC become potent immunostimulatory cells. Until now, the expression profiles of the major components of the MHC class I antigen-processing machinery (APM) during DC development have not been well characterized. In this study, the mRNA and protein expression levels of the IFN-gamma inducible proteasome subunits, of the proteasome activators PA28, and of key components required for peptide transport and MHC class I-peptide complex assembly have been evalu…

Proteasome Endopeptidase ComplexCD74ImmunologyAntigen presentationLipopolysaccharide ReceptorsDown-RegulationImmunoglobulinsMuscle ProteinsAntiportersMonocytesMultienzyme ComplexesMHC class IHumansImmunology and AllergyATP Binding Cassette Transporter Subfamily B Member 2Antigen PresentationMHC class IIbiologyAntigen processingMHC class I antigenHistocompatibility Antigens Class IMembrane Transport ProteinsProteinsCell DifferentiationDendritic CellsGeneral MedicineTransporter associated with antigen processingMHC restrictionMolecular biologyUp-RegulationCell biologyCysteine EndopeptidasesProtein TransportProtein Biosynthesisbiology.proteinATP-Binding Cassette TransportersPeptidesInternational Immunology
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