Measurement of Altered Aspartyl Residues in the Scrapie Associated Form of Prion Protein

Abstract

In transmissible spongiform encephalopathies (TSE), the endogenous protease-sensitive prion protein (PrP-sen) of the host is converted to a pathologic form (PrP-res) that has greatly enhanced proteinase K resistance, insolubility, and beta sheet content. To investigate the possibility that alterations at aspartyl or asparaginyl residues in the form ofd-aspartate and/orl-isoaspartate could play a role in either the formation or stabilization of PrP-res in TSE-infected animals, we assayed for the presence of these abnormal residues in PrP-res. Proteind-aspartyl/l-isoaspartyl carboxyl methyltransferase (PIMT) was used to methylate and radiolabel altered aspartyl residues, which were detected in PrP-res, but at low levels (0.5 mole%). The scarcity ofd-aspartyl and/orl-isoaspartyl groups in PrP-res suggests that this modification is unlikely to be primarily responsible for the differences between PrP-res and PrP-sen. However, it remains possible that such modifications in substoichiometric numbers of PrP molecules could help to initiate the PrP-res formation or stabilize PrP-res polymersin vivo.