Interactions of Prion Protein With Intracellular Proteins: So Many Partners and no Consequences?
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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.
Keywords
Prion protein Protein–protein interactions Protein aggregation Transmissible spongiform encephalopathies NeurotoxicityAbbreviations
- 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
Notes
Acknowledgments
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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