Abstract
Denaturation studies with guanidine HCl (GdnHCl) were performed to test the relationship between scrapie infectivity and properties of scrapie-associated prion protein (PrP(Sc)). Large GdnHCl-induced reductions in infectivity were associated with the irreversible elimination of both the proteinase K resistance and apparent self-propagating converting activity of PrP(Sc). In intermediate GdnHCl concentrations that stimulate converting activity and partially disaggregate PrP(Sc), both scrapie infectivity and converting activity were associated with residual partially protease-resistant multimers of PrP(Sc).
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