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Related Experiment Videos

Membrane immunoglobulin without sheath or anchor

G T Williams1, P Dariavach, A R Venkitaraman

  • 1Medical Research Council Laboratory of Molecular Biology, Cambridge, U.K.

Molecular Immunology
|November 1, 1993
PubMed
Summary

B cell antigen receptors (BCR) typically require a sheath for surface expression. However, IgD and IgG2b can be expressed without a sheath or anchor, unlike IgM, due to transmembrane segment differences.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • The B cell antigen receptor (BCR) is crucial for adaptive immunity.
  • Its canonical form involves membrane immunoglobulin (Ig) complexed with an alpha/beta heterodimer sheath.
  • Surface expression of certain Ig isotypes, like IgM, is dependent on this sheath.

Purpose of the Study:

  • To investigate the surface expression of different immunoglobulin (Ig) isotypes in the absence of the alpha/beta heterodimer sheath.
  • To determine the role of the transmembrane segment in Ig surface localization.
  • To compare the expression patterns of IgD, IgG2b, and IgM.

Main Methods:

  • Utilized myeloma transfectant cell lines.
  • Analyzed the surface expression of IgD, IgG2b, and IgM.

Related Experiment Videos

  • Investigated the necessity of the alpha/beta sheath and glycosyl-phosphatidylinositol (GPI) anchor for surface expression.

    • Main Results:

    • IgD and IgG2b, but not IgM, can be expressed on the cell surface of myeloma transfectants without the alpha/beta sheath.
    • Previous findings indicated some IgD required a GPI anchor, but this study shows naked expression is possible.
    • The ability of IgD and IgG2b to be expressed without a sheath or anchor is linked to their transmembrane segment regions.

    Conclusions:

    • The transmembrane segment sequence dictates whether IgD and IgG2b can be expressed on the cell surface independently of the BCR alpha/beta sheath.
    • This isotype-specific mechanism provides flexibility in B cell receptor assembly and function.
    • Understanding these molecular differences is key to deciphering BCR regulation and signaling.