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Mouse Monoclonal to PAG / Cbp

MEM-255 (IgG2a)

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Background

PAG (phosphoprotein associated with GEMs), also known as Cbp (Csk-binding protein), is a ubiquitously expressed 46 kDa transmembrane adaptor protein present in membrane rafts (glycosphingolipid-enriched microdomains), which however migrates on SDS PAGE gels anomalously as an 80 kDa molecule. Following tyrosine phosphorylation by Src family kinases, PAG binds and thereby activates the protein tyrosine kinase Csk, the major negative regulator of the Src family kinases. Signaling via the B-cell receptor in B cells or high affinity IgE receptor (FcepsilonRI) in mast cells leads to PAG increased tyrosine phosphorylation and Csk binding, while T cell receptor signaling causes PAG dephosphorylation, loss of Csk binding and increased activation of the protein tyrosine kinase Lck.

Specificity

The antibody MEM-255 recognizes an epitope (aa 235-280) of Csk-binding protein (Cbp) located in the cytoplasmic domain, also known as protein associated with glycosphingolipid-enriched microdomains (PAG).

Regulatory Status

Immunogen

Recombinant intracellular fragment (aa 97-432) of human Cbp (PAG).

Species Reactivity:

  • Human

Negative Species:

  • Mouse
  • Rat
  • Bovine

Applications:

  • Flow Cytometry
    Recommended dilution: 2 μg/ml
    Application note:
    intracellular staining, permeabilization required
  • Western Blotting
    Application note:
    Csk binding protein is an ubiquitously expressed 46 kDa transmembrane adaptor protein present in membrane microdomains (rafts), which however migrates on SDS-PAGE gels anomalously as an 80 kDa molecule.
  • Immunohistochemistry (paraffin sections)
    Positive tissue:tonsil, spleen
Usage note:
Indicated dilutions are recommended starting points for use of this product. Working concentrations should be determined by the investigator.

General references

  • *Horejsí V, Zhang W, Schraven B: Transmembrane adaptor proteins: organizers of immunoreceptor signalling. Nat Rev Immunol. 2004 Aug;4(8):603-16. [Abstract]
  • Product Specific References

  • *Brdicka T, Pavlistova D, Leo A, Bruyns E, Korinek V, Angelisova P, Scherer J, Shevchenko A, Hilgert I, Cerny J, Drbal K, Kuramitsu Y, Kornacker B, Horejsi V, Schraven B: Phosphoprotein associated with glycosphingolipid-enriched microdomains (PAG), a novel ubiquitously expressed transmembrane adaptor protein, binds the protein tyrosine kinase csk and is involved in regulation of T cell activation. J Exp Med. 2000 May 1;191(9):1591-604. [Abstract] [Full Text]
  • *Brdickova N, Brdicka T, Andera L, Spicka J, Angelisova P, Milgram SL, Horejsi V: Interaction between two adapter proteins, PAG and EBP50: a possible link between membrane rafts and actin cytoskeleton. FEBS Lett. 2001 Oct 26;507(2):133-6. [Abstract]
  • Semac I, Palomba C, Kulangara K, Klages N, van Echten-Deckert G, Borisch B, Hoessli DC: Anti-CD20 therapeutic antibody rituximab modifies the functional organization of rafts/microdomains of B lymphoma cells. Cancer Res. 2003 Jan 15;63(2):534-40. [Abstract] [Full Text]
  • *Davidson D, Bakinowski M, Thomas ML, Horejsi V, Veillette A: Phosphorylation-dependent regulation of T-cell activation by PAG/Cbp, a lipid raft-associated transmembrane adaptor. Mol Cell Biol. 2003 Mar;23(6):2017-28. [Abstract] [Full Text]
  • *Tedoldi S, Paterson JC, Hansmann ML, Natkunam Y, Rudiger T, Angelisova P, Du MQ, Roberton H, Roncador G, Sanchez L, Pozzobon M, Masir N, Barry R, Pileri S, Mason DY, Marafioti T, Horejsi V: Transmembrane adaptor molecules: a new category of lymphoid-cell markers. Blood. 2006 Jan 1;107(1):213-21. Epub 2005 Sep 13. [Abstract] [Full Text]
  • *Svec A, Velenská Z, Horejsí V: Expression pattern of adaptor protein PAG: correlation between secondary lymphatic follicle and histogenetically related malignant lymphomas. Immunol Lett. 2005 Aug 15;100(1):94-7. [Abstract]
  • *Schatzlmaier P, Supper V, Göschl L, Zwirzitz A, Eckerstorfer P, Ellmeier W, Huppa JB, Stockinger H: Rapid multiplex analysis of lipid raft components with single-cell resolution. Sci Signal. 2015 Sep 22;8(395):rs11 [Abstract]
  • For research use only. Not for drug, diagnostic or other use.

    Related Products

  • Mouse Monoclonal to PAG / Cbp PAG-C1 (IgG2b)
  • Rabbit Polyclonal to PAG / Cbp
  • Mouse IgG2a Isotype Control
  • Example Data


    MEM-255
    Fig. 1. Immunohistochemistry of paraffin-embedded sections





    Fig. 1. Immunohistochemistry staining (paraffin-embedded sections) using anti-Cbp/PAG (MEM-255).
    Cbp/PAG is expressed in germinal centers of lymph node lymphoid follicle and in follicular lymphoma (it is absent from mantle zone). Cbp/PAG is also expressed more weakly in T cells in tonsil and the thymic medulla.

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