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Molecular characterization of the dimer formation of Fcα/μ receptor (CD351)

Kana Takagaki1, Kazuki Satoh, Shin-ichiro Honda

  • 1Department of Immunology, Institute of Basic Medical Sciences, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan.

Molecular Immunology
|May 14, 2013
PubMed

Insights

Fcα/μR (CD351) is an IgA and IgM receptor. This study reveals specific cytoplasmic regions are crucial for its cell surface expression and unique dimer formation, suggesting heterodimerization with an unknown 60-70 kDa molecule.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Fcα/μR (CD351) is an Fc receptor binding IgA and IgM.
  • It forms an atypical dimer resistant to standard reduction methods.
  • Previous work indicated the cytoplasmic portion is vital for dimer formation and cell surface expression.

Purpose of the Study:

  • To elucidate the biochemical mechanisms underlying Fcα/μR dimer formation and cell surface expression.
  • To identify specific amino acid regions within the Fcα/μR cytoplasmic tail responsible for these functions.

Main Methods:

  • Utilized a BW5147 mouse cell line engineered with Fcα/μR cytoplasmic deletion mutants.
  • Employed immunoblotting analysis with differentially tagged Fcα/μR constructs (Flag and hemagglutinin).

Main Results:

  • A region spanning amino acids 504-523 is essential for efficient Fcα/μR cell surface expression.
  • A distinct region, amino acids 481-490, is required for Fcα/μR dimer formation.
  • Fcα/μR does not appear to form homodimers, contrary to initial assumptions.

Conclusions:

  • Fcα/μR forms heterodimers with an unidentified molecule of approximately 60-70 kDa.
  • Specific cytoplasmic domains dictate Fcα/μR's unique dimerization and surface localization properties.

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