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Regulation of PrP(C) signaling and processing by dimerization.

Xavier Roucou1

  • 1Department of Biochemistry, Faculty of Medicine, Université de Sherbrooke Sherbrooke, QC, Canada.

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Summary

Cellular prion protein (PrP(C)) dimerization acts as a molecular switch, regulating its neurotrophic and neurotoxic signaling pathways. This dimerization influences protein inactivation through N-terminal domain release or shedding.

Keywords:
dimerizationneurodegenerationneuroprotectionprion protein traffickingsignaling

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • The cellular prion protein (PrP(C)) is a cell surface protein with a disordered N-terminal domain.
  • PrP(C) interacts with various ligands, mediating both neurotrophic and neurotoxic functions.
  • These opposing activities are linked to distinct signaling pathways and interacting partners.

Purpose of the Study:

  • To review the evidence supporting the role of PrP(C) dimerization in regulating its cell surface receptor activity.
  • To elucidate how dimerization influences PrP(C) signaling and inactivation mechanisms.

Main Methods:

  • Literature review of studies investigating PrP(C) interactions and signaling.
  • Analysis of data on ligand-induced and enforced PrP(C) dimerization.
  • Examination of PrP(C) inactivation mechanisms, including endoproteolysis and ectodomain shedding.

Main Results:

  • PrP(C) dimerization is a key molecular switch for intracellular signaling.
  • Dimerization influences the neurotrophic and neurotoxic functions of PrP(C).
  • PrP(C) inactivation, via N-terminal domain release or shedding, is regulated by dimerization status.

Conclusions:

  • PrP(C) dimerization is a critical regulatory mechanism for its cell surface receptor activity.
  • Understanding PrP(C) dimerization provides insights into prion protein function and dysfunction.
  • Dimerization modulates both the signaling output and the inactivation of PrP(C).