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Related Experiment Videos

A B-cell-specific DNA recombination complex

T Borggrefe1, M Wabl, A T Akhmedov

  • 1Basel Institute for Immunology, Postfach, CH-4005 Basel, Switzerland.

The Journal of Biological Chemistry
|June 27, 1998
PubMed
Summary
This summary is machine-generated.

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Researchers identified the SWAP complex, a multiprotein complex that recombines DNA sequences in immunoglobulin heavy chain switch regions. SWAP-70 protein specifically recruits universal components to form this "switch recombinase".

Area of Science:

  • Molecular Biology
  • Immunology
  • Biochemistry

Background:

  • Immunoglobulin (Ig) heavy chain class switching is a critical process in adaptive immunity.
  • The molecular machinery responsible for Ig switching, particularly the
  • switch recombinase
  • , has remained elusive.

Purpose of the Study:

  • To purify and biochemically characterize the multiprotein complex involved in Ig heavy chain recombination.
  • To identify the specific protein components of this complex and elucidate their roles.

Main Methods:

  • Purification and biochemical characterization of the SWAP complex.
  • DNA transfer assays to assess recombination activity.
  • Protein identification, cDNA cloning, sequencing, and overexpression of SWAP-70.

Related Experiment Videos

  • Analysis of SWAP-70 expression in B lymphocytes and B-cell lines.

    • Main Results:

    • The SWAP complex preferentially recombines Ig heavy chain switch region sequences.
    • Four key proteins identified: B23 (nucleophosmin), C23 (nucleolin), poly(ADP-ribose) polymerase (PARP), and SWAP-70.
    • SWAP-70 is a novel 70 kDa nuclear protein expressed specifically in switching B lymphocytes.
    • SWAP-70 binds ATP and forms high-affinity complexes with B23, C23, and PARP.

    Conclusions:

    • The SWAP complex is likely the long-sought
    • switch recombinase
    • .
    • SWAP-70 acts as a specific targeting element, assembling the recombinase from ubiquitous cellular proteins.
    • This discovery provides critical insight into the molecular mechanisms of Ig class switching.