Abstract
According to the protein-only hypothesis of prion propagation, the pathogenesis of prion disease is due to the misfolding of cellular PrP (PrPC) which gives rise to disease-associated PrPSc. This misfolding results in the predominantly α-helix secondary structure of PrP becoming increasingly β-sheet. Prion protein researchers often employ circular dichroism (CD) spectroscopy to rapidly analyze and identify the degree of α-helix and β-sheet content in their recombinant protein and peptide samples. CD is a nondestructive method of determining protein secondary structure and can be used to monitor the protein structural changes in various environments, e.g., pH and temperature. CD can also be used to investigate kinetic and thermodynamic characteristics of proteins and peptides.
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