• Product nameAnti-TAPA1 antibody [M38]
    See all TAPA1 primary antibodies
  • Description
    Mouse monoclonal [M38] to TAPA1
  • Tested applicationsSuitable for: WB, IP, IHC-P, Functional Studies, ICC, Flow Cytmore details
  • Species reactivity
    Reacts with: Rabbit, Cat, Human
  • Immunogen

    MOLT4 (human T-ALL cell line)

  • Positive control
    • Human MOLT4 T cell line. This antibody gave a positive result in IHC in the following FFPE tissue: Human normal liver. For Western Blot: Jurkat cell line



Our Abpromise guarantee covers the use of ab79559 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
WB Use at an assay dependent concentration. Use under non reducing condition. Predicted molecular weight: 26 kDa.
IP Use at an assay dependent concentration.
IHC-P Use at an assay dependent concentration.
Functional Studies Use at an assay dependent concentration. In human MOLT4 T cell line ab79559 inhibits syncytium formation induced by coculture with human T-cell leukemia virus type 1 (HTLV 1)-positive human T-cell lines.
ICC Use at an assay dependent concentration.
Flow Cyt Use a concentration of 1 µg/ml. ab170190-Mouse monoclonal IgG1, is suitable for use as an isotype control with this antibody.


  • FunctionMay play an important role in the regulation of lymphoma cell growth. Interacts with a 16-kDa Leu-13 protein to form a complex possibly involved in signal transduction. May acts a the viral receptor for HCV.
  • Tissue specificityHematolymphoid, neuroectodermal and mesenchymal tumor cell lines.
  • Involvement in diseaseDefects in CD81 are the cause of immunodeficiency common variable type 6 (CVID6) [MIM:613496]; also called antibody deficiency due to CD81 defect. CVID6 is a primary immunodeficiency characterized by antibody deficiency, hypogammaglobulinemia, recurrent bacterial infections and an inability to mount an antibody response to antigen. The defect results from a failure of B-cell differentiation and impaired secretion of immunoglobulins; the numbers of circulating B cells is usually in the normal range, but can be low.
  • Sequence similaritiesBelongs to the tetraspanin (TM4SF) family.
  • Post-translational
    Not glycosylated.
  • Cellular localizationMembrane.
  • Information by UniProt
  • Database links
  • Alternative names
    • 26 kDa cell surface protein TAPA 1 antibody
    • 26 kDa cell surface protein TAPA-1 antibody
    • 26 kDa cell surface protein TAPA1 antibody
    • CD 81 antibody
    • CD81 antibody
    • CD81 antigen (target of antiproliferative antibody 1) antibody
    • CD81 antigen antibody
    • CD81 molecule antibody
    • CD81_HUMAN antibody
    • CVID6 antibody
    • S5.7 antibody
    • TAPA 1 antibody
    • TAPA1 antibody
    • Target of the antiproliferative antibody 1 antibody
    • Tetraspanin 28 antibody
    • Tetraspanin-28 antibody
    • Tetraspanin28 antibody
    • Tspan 28 antibody
    • Tspan-28 antibody
    • Tspan28 antibody
    see all

Anti-TAPA1 antibody [M38] images

  • IHC image of TAPA1 staining in Human normal liver formalin fixed paraffin embedded tissue section, performed on a Leica Bond™ system using the standard protocol F. The section was pre-treated using heat mediated antigen retrieval with sodium citrate buffer (pH6, epitope retrieval solution 1) for 20 mins. The section was then incubated with ab79559, 5µg/ml, for 15 mins at room temperature and detected using an HRP conjugated compact polymer system. DAB was used as the chromogen. The section was then counterstained with haematoxylin and mounted with DPX.


    For other IHC staining systems (automated and non-automated) customers should optimize variable parameters such as antigen retrieval conditions, primary antibody concentration and antibody incubation times.

  • Overlay histogram showing MOLT4 cells stained with ab79559 (red line). The cells were fixed with 4% paraformaldehyde and incubated in 1x PBS / 10% normal goat serum / 0.3M glycine to block non-specific protein-protein interactions. The cells were then incubated with the antibody (ab79559, 1µg/1x106 cells) for 30 min at 22°C. The secondary antibody used was DyLight® 488 goat anti-mouse IgG (H+L) (ab96879) at 1/500 dilution for 30 min at 22°C. Isotype control antibody (black line) was mouse IgG1 [ICIGG1] (ab91353, 2µg/1x106 cells) used under the same conditions. Acquisition of >5,000 events was performed. This antibody gave a positive signal in MOLT4 cells fixed with methanol (5 min) used under the same conditions.

    Please note that Abcam do not have data for use of this antibody on non-fixed cells. We welcome any customer feedback.

References for Anti-TAPA1 antibody [M38] (ab79559)

This product has been referenced in:
  • Escola JM  et al. Selective enrichment of tetraspan proteins on the internal vesicles of multivesicular endosomes and on exosomes secreted by human B-lymphocytes. J Biol Chem 273:20121-7 (1998). Read more (PubMed: 9685355) »
  • Imai T & Yoshie O C33 antigen and M38 antigen recognized by monoclonal antibodies inhibitory to syncytium formation by human T cell leukemia virus type 1 are both members of the transmembrane 4 superfamily and associate with each other and with CD4 or CD8 in T cells. J Immunol 151:6470-81 (1993). Read more (PubMed: 8245480) »

See all 3 Publications for this product

Product Wall

Application Immunocytochemistry/ Immunofluorescence
Sample Human Cell (SH-SY5Y)
Permeabilization Yes - 0.2% Triton-X
Specification SH-SY5Y
Blocking step BSA as blocking agent for 2 hour(s) and 0 minute(s) · Concentration: 5% · Temperature: 4°C
Fixative Paraformaldehyde

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Submitted Nov 09 2015

Thank you for getting back to me and for confirming the order details and the batch number.
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Thank you for your enquiry regarding ab109201 and for taking the time to provide some useful details of the experiments. I am very sorry to hear that you are having problems with this antibody.
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