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Native Cell Membrane Nanoparticles System for Membrane Protein-Protein Interaction Analysis
Published on: July 16, 2020
PrP(106-126) does not interact with membranes under physiological conditions
Sónia Troeira Henriques1, Leonard Keith Pattenden, Marie-Isabel Aguilar
1Instituto de Medicina Molecular, Faculdade de Medicina da Universidade de Lisboa, Lisbon, Portugal.
Biophysical Journal
|May 13, 2008
Summary
The prion protein fragment PrP(106-126) shows low affinity for lipid membranes under physiological conditions. Its interaction with membranes, crucial for neurodegeneration, only occurs under strong electrostatic conditions.
Area of Science:
- Neuroscience
- Biochemistry
- Molecular Biology
Background:
- Transmissible spongiform encephalopathies (TSEs) are linked to abnormal prion protein (PrPSc) accumulation.
- The PrP(106-126) fragment mimics pathological PrPSc features, with proposed roles in neurodegeneration via membrane interactions.
- Direct evidence for PrPSc-induced membrane modulation or channel formation remains limited.
Purpose of the Study:
- To investigate the interaction of the prion protein fragment PrP(106-126) with model lipid membranes.
- To characterize peptide-membrane interactions under varying conditions relevant to cellular environments.
- To elucidate the role of membrane properties in the neurotoxic effects of prion protein fragments.
Main Methods:
- Utilized surface plasmon resonance (SPR) and fluorescence methodologies.
- Examined interactions with model membranes of diverse lipid compositions (including phosphatidylserine and GM1 ganglioside).
- Assessed effects of membrane charge, viscosity, lipid composition, pH, and ionic strength on peptide-membrane binding.
Main Results:
- PrP(106-126) exhibited low affinity for lipid membranes under physiological conditions, with no observed membrane disturbances.
- Membrane insertion and leakage were induced only under conditions favoring strong electrostatic interactions.
- These findings suggest that electrostatic forces are critical for PrP(106-126) to affect membranes.
Conclusions:
- Prion protein fragment PrP(106-126) interaction with lipid membranes is weak under physiological conditions.
- Significant membrane effects require specific, strong electrostatic interactions, not typical in healthy cells.
- Results support the hypothesis that the physiological prion protein (PrPC) mediates the toxic effects of PrP(106-126) in neurons.
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