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Related Experiment Videos

A developmentally regulated glycoprotein complex from Dictyostelium discoideum

N Watson1, K L Williams, S Alexander

  • 1Division of Biological Sciences, University of Missouri, Columbia 65211.

The Journal of Biological Chemistry
|October 25, 1993
PubMed
Summary

Monoclonal antibody MUD50 identifies an O-linked oligosaccharide on Dictyostelium discoideum glycoproteins. This study reveals the PsB glycoprotein is part of a six-protein complex, crucial for understanding O-glycosylation.

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Glycobiology

Background:

  • Monoclonal antibody MUD50 recognizes developmentally regulated O-linked oligosaccharides in Dictyostelium discoideum.
  • The expression of this epitope is dependent on the wild-type modB allele.
  • Glycoproteins exhibiting this epitope are structurally diverse, including integral membrane and soluble forms.

Purpose of the Study:

  • To characterize the molecular composition and assembly of the PsB glycoprotein.
  • To investigate the role of O-glycosylation in protein complex formation.
  • To establish a foundation for studying the biosynthesis and processing of O-glycosylated proteins.

Main Methods:

  • Western blot analysis using monoclonal antibodies MUD50 and MUD102.

Related Experiment Videos

  • Biochemical characterization of a multiprotein complex.
  • Assessment of N-glycosylation using peptide N-glycosidase F.
  • Analysis of protein phosphorylation.

    • Main Results:

    • The PsB glycoprotein is a component of a developmentally regulated multiprotein complex containing six distinct proteins.
    • The complex is stabilized by both covalent and noncovalent interactions.
    • Only the PsB glycoprotein possesses the MUD50-recognized O-linked oligosaccharide determinant; no N-glycosylation was detected in any complex protein.
    • One protein within the complex is heavily phosphorylated.

    Conclusions:

    • The PsB glycoprotein is part of a complex assembly involving multiple proteins.
    • O-glycosylation appears to be a specific modification of the PsB component within this complex.
    • This research provides a basis for further investigation into the synthesis, modification, and assembly of O-glycosylated proteins in Dictyostelium discoideum.