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Real-time Quaking-induced Conversion Assay for Detection of CWD Prions in Fecal Material

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Prion protein self-peptides modulate prion interactions and conversion.

Alan Rigter¹, Jan Priem, Drophatie Timmers-Parohi

¹Department of Bacteriology and TSEs, Central Veterinary Institute (CVI) of Wageningen UR, Lelystad, 8200 AB, the Netherlands. alan.rigter@wur.nl

BMC Biochemistry

|December 1, 2009

Summary

This study investigated prion protein (PrP) interactions, identifying key domains involved in PrP(C) to PrP(Sc) conversion. Specific peptides modulate these interactions, offering potential therapeutic targets for prion diseases.

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Area of Science:

Neuroscience
Biochemistry
Molecular Biology

Background:

Prion diseases involve the conversion of cellular prion protein (PrP(C)) to the scrapie isoform (PrP(Sc)).
The molecular mechanisms of this conversion and the role of PrP self-interaction are not fully understood.
Understanding these interactions is crucial for addressing prion agent replication.

Purpose of the Study:

To investigate the role of specific ovine prion protein (PrP) domains in PrP self-interaction and conversion.
To identify peptides that can modulate PrP self-interaction and the conversion process.
To explore potential therapeutic targets for prion diseases based on these interactions.

Main Methods:

Utilized a solid-phase PrP peptide array to assess PrP self-interaction.
Employed the prion protein misfolding cyclic amplification (PMCA) reaction to study prion conversion.
Investigated the effect of six ovine PrP-based peptides on PrP self-interaction and conversion.

Main Results:

Three peptides (octarepeat, binding domain 2, C-terminal) inhibited PrP self-interaction.
Three peptides (N-terminal, binding domain 2, amyloidogenic motif) modulated prion conversion.
Specific peptides affected conversion differently depending on their addition time relative to PrP(C) and PrP(Sc) mixing.

Conclusions:

Identified a putative PrP core binding domain involved in PrP(C)-PrP(Sc) interaction.
Octarepeat peptides may stabilize PrP(C)-PrP(Sc) interactions.
Binding domain 2 and C-terminal domains are directly implicated in PrP self-interaction during conversion, representing potential therapeutic targets.