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Doppel and PrP(C) do not share the same membrane microenvironment.
Yuval Shaked1, Nuha Hijazi, Ruth Gabizon
1The Anges Ginges Center, Department of Neurology, Hadassah University Hospital, Jerusalem, Israel.
FEBS Letters
|October 22, 2002
Summary
Doppel, a protein similar to the prion protein PrP(C), does not share the same cellular location or function. This suggests Doppel cannot fully compensate for the absence of PrP(C).
Area of Science:
- Biochemistry
- Cell Biology
- Neuroscience
Background:
- Doppel is a paralog of the cellular prion protein, PrP(C).
- PrP(0/0) mice lacking PrP(C) have been suggested to be compensated by Doppel.
- The cellular localization and functional overlap between Doppel and PrP(C) remain unclear.
Purpose of the Study:
- To investigate whether Doppel and PrP(C) share the same cellular location.
- To determine if Doppel and PrP(C) interact with the same cellular components.
- To assess the functional similarity between Doppel and PrP(C).
Main Methods:
- Co-immunoprecipitation assays using specific antibodies.
- Copper (Cu2+) immobilized metal affinity chromatography (IMAC) resin retention assays.
- Analysis under detergent conditions preserving membrane rafts.
Main Results:
- Neither PrP(C) nor Doppel co-immunoprecipitated under intact membrane raft conditions.
- Doppel was not retained by the Cu(2+)IMAC resin, unlike PrP(C).
- Both proteins are raft-associated but reside in distinct membrane microenvironments.
Conclusions:
- Doppel and PrP(C) do not co-localize within the same membrane microenvironment.
- The distinct localization suggests that Doppel and PrP(C) likely do not perform identical cellular functions.
- Doppel may not fully compensate for PrP(C) in PrP(0/0) mice due to functional differences.