Identification of glycoinositol phospholipid linked and truncated forms of the scrapie prion protein.
Analysis of carboxy-terminal peptides derived from endoproteinase Lys-C digests of the scrapie isoform of the hamster prion protein revealed that the majority of the molecules are glycoinositol phospholipid linked through ethanolamine attached at serin-231. However, approximately 15% of PrPSc had a carboxy-terminal peptide that ends at glycine-228. It is intriguing that this glycine is part of the PrP sequence Gly-Arg-Arg, which is an established target sequence for the proteolysis and release of bioactive peptides from larger precursors. The mechanism of formation, as well as the role of the truncated carboxy terminus in the dissemination and neuropathology of scrapie, remains to be determined.
Stahl
N
N
Department of Neurology, University of California, San Francisco 94143.
Baldwin
M A
MA
Burlingame
A L
AL
Prusiner
S B
SB
D000595:Amino Acid Sequence; D000818:Animals; D001923:Brain Chemistry; D002851:Chromatography, High Pressure Liquid; D006224:Cricetinae; D010450:Endopeptidases; D004983:Ethanolamines / Q000378:metabolism; D006017:Glycolipids / Q000737:chemistry* / Q000378:metabolism; D017261:Glycosylphosphatidylinositols; D006868:Hydrolysis; D008969:Molecular Sequence Data; D010716:Phosphatidylinositols / Q000737:chemistry* / Q000378:metabolism; D018620:PrPSc Proteins; D011328:Prions / Q000032:analysis; D012608:Scrapie / Q000175:diagnosis; D014764:Viral Proteins / Q000737:chemistry* / Q000378:metabolism
D004983:Ethanolamines; D006017:Glycolipids; D017261:Glycosylphosphatidylinositols; D010716:Phosphatidylinositols; D018620:PrPSc Proteins; D011328:Prions; D014764:Viral Proteins; D010450:Endopeptidases