title: PrP(Sc) typing by N-terminal sequencing and mass spectrometry.
abstract: The heterogeneity of the clinicopathological phenotype in human prion diseases is associated with the presence of the different forms of the abnormal prion protein, PrP(Sc). We have previously shown that PrP(Sc) in FFI and a subtype of familial CJD linked to the D178N mutation can be distinguished by their difference in gel mobility following proteinase K (PK) treatment. To further characterize the structural difference of PrP(Sc) in familial prion diseases, N-terminal sequencing and mass spectrometry were used to identify the protease cleavage sites in PrP(Sc) extracted from affected brains. We found that the main PK cleavage sites of PrP(Sc) are located at residue 97 in FFI, and residue 82 in both CJD178 and a GSS subtype linked to the P102L mutation. The differential accessibility to protease in the native PrP(Sc) suggests that PrP(Sc) exist as distinct conformers in different disease states.
authors.affiliation: Division of Neuropathology, Institute of Pathology, Case Western Reserve University, Cleveland, Ohio 44106, USA.
authors.forename: S G
authors.initials: SG
authors.lastname: Chen
authors.forename: W
authors.initials: W
authors.lastname: Zou
authors.forename: P
authors.initials: P
authors.lastname: Parchi
authors.forename: P
authors.initials: P
authors.lastname: Gambetti
mesh_terms: D001921:Brain / Q000473:pathology; D001923:Brain Chemistry; D006801:Humans; D013058:Mass Spectrometry / Q000379:methods; D018620:PrPSc Proteins / Q000737:chemistry* / Q000145:classification* / Q000235:genetics; D017096:Prion Diseases / Q000378:metabolism; D020539:Sequence Analysis, Protein
chemical_list: D018620:PrPSc Proteins