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Modulation of prion protein structural integrity by geldanamycin.
H-J Ochel1, G Gademann, J Trepel
1Otto-von-Guericke-University, Medical Faculty, Clinic for Radiation Therapy, Radiobiological Laboratory, Leipziger Str. 44, 39120 Magdeburg, Germany. hans-joachim.ochel@medizin.uni-magdeburg.de
Glycobiology
|May 30, 2003
Summary
Inhibiting HSP90 molecular chaperones alters the normal prion protein (PrPc). This leads to changes in its glycosylation or conformation, affecting its properties and potentially neurodegenerative disease pathways.
Area of Science:
- Neurobiology
- Molecular Biology
- Biochemistry
Background:
- The cellular prion protein (PrPc) is central to neurodegenerative transmissible spongiform encephalopathies.
- Understanding PrPc's stability and regulation is key to addressing these diseases.
Purpose of the Study:
- To investigate the role of HSP90 molecular chaperones in maintaining the integrity of normal PrPc.
- To determine if HSP90 inhibition affects PrPc's physicochemical properties.
Main Methods:
- Eukaryotic cells were treated with HSP90 inhibitors (geldanamycin, radicicol) and a non-inhibitor analog (geldampicin).
- Western blot analysis was used to detect changes in PrPc.
- Experiments involved assessing the necessity of protein/mRNA synthesis and using tunicamycin and enzymatic deglycosylation (PNGase F).
Main Results:
- HSP90 inhibitors induced PrPc, showing faster migration on western blots.
- This effect required ongoing protein and mRNA synthesis and was abrogated by tunicamycin.
- Deglycosylation studies indicated altered glycosylation or conformation changes in PrPc.
Conclusions:
- HSP90 inhibition significantly alters the physicochemical properties of PrPc.
- Changes in glycosylation and/or protein conformation are implicated in the observed effects.
- These findings highlight the role of HSP90 in PrPc regulation and its potential relevance to prion diseases.