Abstract
Prion protein (PrP) plays a key role in the pathogenesis of transmissible spongiform encephalopathies (TSEs)—fatal diseases of the central nervous system. Its physiological function as well as exact role in neurodegeneration remain unclear, hence screens for proteins interacting with PrP seem to be the most promising approach to elucidating these issues. PrP is mostly a plasma membrane-anchored extracellular glycoprotein and only a small fraction resides inside the cell, yet the number of identified intracellular partners of PrP is comparable to that of its membranal or extracellular interactors. Since some TSEs are accompanied by significantly increased levels of cytoplasmic PrP and this fraction of the protein has been found to be neurotoxic, it is of particular interest to characterize the intracellular interactome of PrP. It seems reasonable that at elevated cytoplasmic levels, PrP may exert cytotoxic effect by affecting the physiological functions of its intracellular interactors. This review is focused on the cytoplasmic partners of PrP along with possible consequences of their binding.

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- Bcl-2:
-
B-cell lymphoma 2 protein
- BSE:
-
Bovine spongiform encephalopathy
- C1:
-
N-terminally truncated form of PrP encompassing residues ~110/112–231
- C2:
-
N-terminally truncated form of PrP encompassing residues ~90/91–231
- CaMKIIα:
-
Calcium/calmodulin-dependent protein kinase α type II
- CJD:
-
Creutzfeldt–Jakob disease
- CK2:
-
Casein kinase 2
- CtmPrP:
-
Transmembrane form of PrP with the C-terminus residing in the lumen of ER
- CWD:
-
Chronic wasting disease
- cyPrP, cytPrP, cytoPrP:
-
PrP residing entirely in the cytosol
- ER:
-
Endoplasmic reticulum
- FFI:
-
Fatal familial insomnia
- GFAP:
-
Glial fibrillary acidic protein
- GPI:
-
Glycosylphosphatidylinositol
- Grb2:
-
Growth factor receptor-bound protein 2
- GSS:
-
Gerstmann–Sträussler–Scheinker disease
- HEK:
-
Human embryonic kidney cells
- hnRNP:
-
Heterogeneous nuclear ribonucleoprotein
- Hsp:
-
Heat shock protein
- MAPs:
-
Microtubule-associated proteins
- Mgrn:
-
Mahogunin
- NLS:
-
Nuclear localization signal
- NRAGE:
-
Neurotrophin receptor-interacting MAGE homolog
- Nrf2:
-
Nuclear factor erythroid 2-related factor 2
- NtmPrP:
-
Transmembrane form of PrP with the N-terminus residing in the lumen of ER
- OR:
-
Octapeptide repeats
- PK:
-
Proteinase K
- Prnp :
-
Prion protein gene
- PrP:
-
Prion protein
- PrPC :
-
Cellular form of PrP
- PrPSc :
-
Scrapie form of PrP
- rPrP:
-
Recombinant PrP
- SP:
-
Signal peptide
- TM:
-
Transmembrane domain
- TSE:
-
Transmissible spongiform encephalopathy
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The author thanks Dr. Hanna Nieznanska for critical reading of the manuscript and helpful comments. This work was supported by a statutory grant to the Nencki Institute of Experimental Biology from the Ministry of Science and Higher Education.
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Nieznanski, K. Interactions of Prion Protein With Intracellular Proteins: So Many Partners and no Consequences?. Cell Mol Neurobiol 30, 653–666 (2010). https://doi.org/10.1007/s10571-009-9491-2
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DOI: https://doi.org/10.1007/s10571-009-9491-2

