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Related Experiment Videos

Staphylococcal protein A in immunoferritin techniques.

T Bächi, G Dorval, H Wigzell

    Scandinavian Journal of Immunology
    |January 1, 1977
    PubMed
    Summary
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    Protein A (pA) and its ferritin conjugate (pA-F) serve as specific markers for immunoglobulin G (IgG) in electron microscopy. This method enables precise labeling of cell surface antigens, as demonstrated with human erythrocytes.

    Area of Science:

    • Immunoelectron Microscopy
    • Bioconjugation Chemistry
    • Cell Surface Antigen Detection

    Background:

    • Protein A (pA) from Staphylococcus aureus binds to the Fc region of mammalian immunoglobulins (IgG).
    • Electron microscopy requires specific markers for visualizing cellular structures and molecules.
    • Immunoferritin techniques utilize antibody-antigen interactions for detection.

    Purpose of the Study:

    • To develop and demonstrate a specific labeling method using Protein A for electron microscopy.
    • To create a Protein A-ferritin conjugate (pA-F) as a highly specific marker for IgG.
    • To utilize native Protein A as a bridging agent for indirect immunoferritin labeling.

    Main Methods:

    • Conjugation of Protein A with ferritin using bis(4-fluoro-3-nitrophenyl) sulfone to create pA-F.

    Related Experiment Videos

  • Indirect labeling experiments using pA-F as a marker for IgG.
  • Application of native pA as a noncovalent bridge between antibodies and antiferritin.
  • Demonstration with a model system of human erythrocytes and specific antisera.

    • Main Results:

    • The pA-F conjugate functions as a highly specific marker for IgG in indirect labeling.
    • Native pA effectively bridges specific antibodies to the antiferritin-conjugated marker.
    • The method successfully labeled different surface antigens on human erythrocytes.

    Conclusions:

    • Protein A and its ferritin conjugate (pA-F) are effective tools for electron-microscopical immunoferritin labeling of IgG.
    • This technique provides a specific and versatile method for visualizing cell surface antigens.
    • The combined use of native pA and pA-F offers a robust approach for indirect immunolabeling.