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Direct interaction between prion protein and tubulin
Krzysztof Nieznanski1, Hanna Nieznanska, Krzysztof J Skowronek
1Department of Muscle Biochemistry, Nencki Institute of Experimental Biology, Warsaw, Poland. k.nieznanski@nencki.gov.pl
Biochemical and Biophysical Research Communications
|July 12, 2005
Summary
Cellular prion protein (PrP(C)) interacts with tubulin, a key microtubule component. This interaction involves full-length PrP(C) and shows higher affinity for polymerized tubulin.
Area of Science:
- Neuroscience
- Biochemistry
- Cell Biology
Background:
- Cellular prion protein (PrP(C)) is known to form multimolecular complexes.
- Understanding PrP(C) interactions is crucial for elucidating its cellular functions.
Purpose of the Study:
- To identify molecules interacting with PrP(C) in brain extracts.
- To characterize the interaction between PrP(C) and tubulin.
Main Methods:
- Zero-length cross-linking using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC).
- Cu(2+)-loaded immobilized metal affinity chromatography.
- Cosedimentation assays with recombinant human PrP (rPrP) and tubulin.
Main Results:
- Tubulin was identified as a PrP(C)-interacting molecule in porcine brain extracts.
- Full-length PrP(C), but not the C1 fragment, binds to tubulin.
- Direct interaction between rPrP and tubulin was confirmed, with higher affinity for microtubules.
Conclusions:
- PrP(C) directly binds to both alpha- and beta-tubulin isoforms.
- Prion protein exhibits preferential binding to polymerized tubulin (microtubules).
- This interaction suggests a role for PrP(C) in microtubule-associated cellular processes.