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• W2122178388 abstract "ABSTRACT Infection by prions involves conversion of a host-encoded cell surface protein (PrP C ) to a disease-related isoform (PrP Sc ). PrP C carries two glycosylation sites variably occupied by complex N-glycans, which have been suggested by previous studies to influence the susceptibility to these diseases and to determine characteristics of prion strains. We used the Rov cell system, which is susceptible to sheep prions, to generate a series of PrP C glycosylation mutants with mutations at one or both attachment sites. We examined their subcellular trafficking and ability to convert into PrP Sc and to sustain stable prion propagation in the absence of wild-type PrP. The susceptibility to infection of mutants monoglycosylated at either site differed dramatically depending on the amino acid substitution. Aglycosylated double mutants showed overaccumulation in the Golgi compartment and failed to be infected. Introduction of an ectopic glycosylation site near the N terminus fully restored cell surface expression of PrP but not convertibility into PrP Sc , while PrP C with three glycosylation sites conferred cell permissiveness to infection similarly to the wild type. In contrast, predominantly aglycosylated molecules with nonmutated N-glycosylation sequons, produced in cells expressing glycosylphosphatidylinositol-anchorless PrP C , were able to form infectious PrP Sc . Together our findings suggest that glycosylation is important for efficient trafficking of anchored PrP to the cell surface and sustained prion propagation. However, properly trafficked glycosylation mutants were not necessarily prone to conversion, thus making it difficult in such studies to discern whether the amino acid changes or glycan chain removal most influences the permissiveness to prion infection." @default.
• W2122178388 created "2016-06-24" @default.
• W2122178388 creator A5036721635 @default.
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• W2122178388 creator A5088564920 @default.
• W2122178388 date "2011-04-01" @default.
• W2122178388 modified "2023-09-27" @default.
• W2122178388 title "Prion Propagation in Cells Expressing PrP Glycosylation Mutants" @default.
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• W2122178388 doi "https://doi.org/10.1128/jvi.02257-10" @default.
• W2122178388 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3067877" @default.
• W2122178388 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21248032" @default.
• W2122178388 hasPublicationYear "2011" @default.
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