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Related Experiment Videos

Defining desmosomal plakophilin-3 interactions.

Stefan Bonné1, Barbara Gilbert, Mechthild Hatzfeld

  • 1Molecular Cell Biology Unit, Department for Molecular Biomedical Research, Flanders Interuniversity Institute for Biotechnology (VIB)-Ghent University, B-9000 Ghent, Belgium.

The Journal of Cell Biology
|April 23, 2003
PubMed
Summary
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Plakophilin 3 (PKP3) is a unique desmosomal plaque protein. It interacts with multiple desmosomal cadherins and plakoglobin, contributing to epithelial desmosome structure and keratin anchoring.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Epithelial Biology

Background:

  • Plakophilin 3 (PKP3) is an armadillo protein found in the desmosomal plaque of simple and stratified epithelia.
  • Understanding PKP3's interactions is crucial for comprehending desmosome assembly and function.

Purpose of the Study:

  • To investigate the localization and desmosomal binding properties of Plakophilin 3 (PKP3).
  • To identify the specific desmosomal proteins interacting with PKP3.

Main Methods:

  • Generation of novel mouse anti-PKP3 monoclonal antibodies (mAbs).
  • Yeast two-hybrid assays, coimmunoprecipitation, and colocalization experiments were employed.
  • Analysis of endogenous and exogenous PKP3 and its fragments.

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Main Results:

  • PKP3 binds to desmogleins and multiple desmocollin (Dsc) isoforms, including the novel Dsc-b isoform.
  • PKP3 interacts with plakoglobin, desmoplakin (DP), and keratin 18.
  • Evidence suggests at least two DP-PKP3 interaction sites, potentially stabilizing desmosomes.

Conclusions:

  • PKP3 exhibits a broader interaction profile and expression pattern than PKP1 and PKP2.
  • PKP3 acts as a versatile multi-protein binding element in epithelial desmosome architecture.
  • These interactions contribute to desmosome size and keratin filament anchoring in stratified epithelia.