PrPC Unfolding Identified as Critical Step in PrPSc Propagation
A study published in the Proceedings of the National Academy of Sciences (PNAS) in May 2026 elucidates the molecular mechanisms underlying prion propagation. While the structural determination of PrPSc, the infectious isoform of the prion protein, has advanced understanding of this quintessential prion, challenges remain in explaining its templating efficiency. PrPSc is characterized as a standard amyloid composed of flat stacked monomers, presenting a templating surface that directs conversion. This research highlights the unfolding of the cellular prion protein (PrPC) as a critical prerequisite step before it can refold into the pathological PrPSc structure. By identifying unfolding as a key kinetic barrier and mechanistic step, the findings provide deeper insights into how prions replicate and spread within biological systems. This discovery is significant for understanding neurodegenerative diseases associated with prion misfolding, such as Creutzfeldt-Jakob disease, and may inform future therapeutic strategies aimed at interrupting the conversion process by stabilizing PrPC or inhibiting its unfolding.
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PrPC Unfolding Identified as Critical Step in PrPSc Propagation
A study published in the Proceedings of the National Academy of Sciences (PNAS) in May 2026 elucidates the molecular mechanisms underlying prion propagation. While the structural determination of PrPSc, the infectious isoform of the prion protein, has advanced understanding of this quintessential prion, challenges remain in explaining its templating efficiency. PrPSc is characterized as a standard amyloid composed of flat stacked monomers, presenting a templating surface that directs conversion. This research highlights the unfolding of the cellular prion protein (PrPC) as a critical prerequisite step before it can refold into the pathological PrPSc structure. By identifying unfolding as a key kinetic barrier and mechanistic step, the findings provide deeper insights into how prions replicate and spread within biological systems. This discovery is significant for understanding neurodegenerative diseases associated with prion misfolding, such as Creutzfeldt-Jakob disease, and may inform future therapeutic strategies aimed at interrupting the conversion process by stabilizing PrPC or inhibiting its unfolding.
Proceedings of the National Academy of Sciences: Proceedings of the National Academy of Sciences: Table of Contents