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Updated: Nov 18, 2025

Isolation of Soluble and Insoluble PrP Oligomers in the Normal Human Brain
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Isolation of Soluble and Insoluble PrP Oligomers in the Normal Human Brain

Published on: October 3, 2012

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The G127V variant of the prion protein interferes with dimer formation in vitro but not in cellulo

Sudheer Babu Sangeetham1,2, Anna Dorothee Engelke3,4, Elfrieda Fodor1

  • 1Institute of Biochemistry, Biological Research Centre, Szeged, 6726, Hungary.

Scientific Reports
|February 5, 2021
PubMed

Insights

The G127V prion protein variant hinders prion formation in vitro. However, this inhibitory effect on prion dimerization is not observed in mammalian cell cultures, suggesting complex cellular influences.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Molecular Biology

Background:

  • Prion diseases, or transmissible spongiform encephalopathies (TSEs), are linked to the misfolding and aggregation of the prion protein (PrP).
  • The exact mechanisms of PrPSc formation and the role of protein dimerization are not fully understood.
  • A G127V mutation in human PrP is proposed to confer resistance to TSEs, potentially by inhibiting PrP dimerization.

Purpose of the Study:

  • To investigate the effect of the G127V mutation on prion protein (PrP) dimerization.
  • To compare PrP dimerization in vitro versus within a mammalian cell culture system.

Main Methods:

  • In vitro biochemical assays to assess PrP dimerization.
  • Mammalian cell culture experiments to study PrP dimerization in a cellular context.
  • Analysis of both wild-type (127GPrP) and mutant (127VPrP) forms.

Main Results:

  • In vitro studies indicated that the G127V mutation inhibits the dimerization of PrP.
  • Mammalian cell culture experiments did not show evidence of inhibited PrP dimerization due to the G127V mutation.
  • Discrepancies between in vitro and cellular findings suggest that cellular factors influence PrP dimerization.

Conclusions:

  • While molecular dynamics and in vitro data suggest the G127V mutation impairs PrP dimerization, this effect is not consistently observed in complex cellular environments.
  • Cellular context significantly impacts prion protein interactions and potentially TSE pathogenesis.
  • Further research is needed to elucidate the mechanisms underlying PrP resistance to TSEs in cellular systems.

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