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Related Experiment Videos

CD83 is a dimer: Comparative analysis of monomeric and dimeric isoforms.

Matthias Lechmann1, Nicole Kotzor, Elisabeth Zinser

  • 1University Hospital Erlangen, Department of Dermatology, Hartmannstr. 14, D-91052 Erlangen, Germany.

Biochemical and Biophysical Research Communications
|February 22, 2005
PubMed
Summary

Soluble CD83 dimerization, mediated by a specific cysteine, is crucial for its immunosuppressive function. Mutating this cysteine blocks CD83 expression during dendritic cell maturation and inhibits T-cell stimulation.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Protein Chemistry

Background:

  • Soluble CD83 exhibits potent immunosuppressive activity in vitro and in vivo.
  • Structural analysis revealed five cysteines in the extracellular Ig-domain of CD83.
  • Potential roles for these cysteines include intramolecular disulfide bonds and intermolecular covalent disulfide bond formation, leading to dimerization.

Purpose of the Study:

  • To investigate the role of the fifth cysteine residue in soluble CD83 dimerization.
  • To determine the functional consequences of impaired CD83 dimerization on dendritic cell maturation and T-cell stimulation.

Main Methods:

  • Recombinant mutational analysis, specifically mutating cysteine at position 129 to serine.
  • Functional assays to assess CD83 expression during dendritic cell (DC) maturation.

Related Experiment Videos

  • Mixed lymphocyte reaction (MLR) assays to evaluate T-cell stimulation inhibition.

    • Main Results:

    • Mutation of the fifth cysteine (C129S) abolished soluble CD83 dimerization.
    • The mutant soluble CD83 protein significantly inhibited CD83 expression upregulation during DC maturation.
    • The mutant protein demonstrated impaired ability to inhibit DC-mediated allogeneic T-cell stimulation in vitro.

    Conclusions:

    • The fifth cysteine residue is essential for soluble CD83 dimerization.
    • CD83 dimerization is critical for its immunosuppressive function, particularly in regulating DC maturation and T-cell activation.