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Identification of proteins with high affinity for refolded and native PrPC
Spyros Petrakis1, Theodoros Sklaviadis
1Prion Disease Research Group, Laboratory of Pharmacology, Department of Pharmaceutical Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece.
Proteomics
|November 18, 2006
Summary
Researchers identified proteins interacting with the cellular prion protein (PrPC) in brain tissue. These findings suggest PrPC plays a role in cytoskeleton formation and signal transduction, potentially impacting nervous system receptor function.
Area of Science:
- Neuroscience
- Biochemistry
- Molecular Biology
Background:
- The cellular prion protein (PrPC) is abundant in tissues like the brain, but its function is not fully understood.
- Prion protein conversion to a pathological form (PrPSc) drives transmissible spongiform encephalopathies (TSEs), involving unknown host factors.
- Identifying PrP-binding proteins can illuminate prion biology and TSE pathogenesis.
Purpose of the Study:
- To identify proteins that interact with the cellular prion protein (PrPC) in brain tissue.
- To investigate the biological functions of PrPC by characterizing its associated proteins.
Main Methods:
- Affinity purification using immobilized recombinant PrP (recPrP) to isolate interacting proteins from brain homogenates.
- Cross-linking and co-immunoprecipitation assays to identify native PrPC-associated proteins.
- Mass spectrometry (MS), including LC-MS/MS, for protein identification, with Western blot verification.
Main Results:
- Proteins associated with PrPC were identified from normal individual brain tissue.
- Identified proteins are involved in cytoskeleton formation.
- Identified proteins participate in signal transduction pathways.
Conclusions:
- PrPC interacts with proteins crucial for cytoskeleton organization.
- PrPC is implicated in signal transduction processes within the nervous system.
- These findings support a role for PrPC in the regulation of nervous system receptors.
