NR AHCA

AU Lawson,V.A.; Priola,S.A.; Wehrly,K.; Chesebro,B.

TI N-terminal truncation of prion protein affects both formation and conformation of abnormal protease-resistant prion protein generated in vitro

QU The Journal of Biological Chemistry 2001 Sep 21; 276(38): 35265-71

PT journal article

AB Transmissible spongiform encephalopathy diseases are characterized by conversion of the normal protease-sensitive host prion protein, PrP-sen, to an abnormal protease-resistant form, PrPres. In the current study, deletions were introduced into the flexible tail of PrP-sen (23) to determine if this region was required for formation of PrPres in a cell-free assay. PrPres formation was significantly reduced by deletion of residues 34-94 relative to full-length hamster PrP. Deletion of another nineteen amino acids to residue 113 further reduced the amount of PrPres formed. Furthermore, the presence of additional proteinase K cleavage sites indicated that deletion to residue 113 generated a protease-resistant product with an altered conformation. Conversion of PrP deletion mutants was also affected by post-translational modifications to PrP-sen. Conversion of unglycosylated PrP-sen appeared to alter both the amount and the conformation of protease-resistant PrPres produced from N-terminally truncated PrP-sen. The N-terminal region also affected the ability of hamster PrP to block mouse PrPres formation in scrapie-infected mouse neuroblastoma cells. Thus, regions within the flexible N-terminal tail of PrP influenced interactions required for both generating and disrupting PrPres formation.

MH Animal; Cell-Free System; Endopeptidases/*metabolism; Glycosylphosphatidylinositols/metabolism; Hamsters; In Vitro; Mice; Molecular Weight; Prions/chemistry/*metabolism; Protein Conformation; Sequence Deletion

AD Laboratory of Persistent Viral Diseases, Rocky Mountain Laboratories, NIAID, National Institutes of Health, Hamilton, Montana 59840, USA

SP englisch

PO USA

EA pdf-Datei

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