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Abstract
A conformational change from normal prion protein(PrPC) to abnormal prion protein(PrPSC) induces fatal neurodegenerative diseases. Acidic pH is well-known factors involved in the conformational change. Because the protonation of H187 is strongly linked to the change in PrP stability, we examined the charged residues R156, E196, and D202 around H187. Interestingly, there have been reports on pathological mutants, such as H187R, E196A, and D202N. In this study, we focused on how an acidic pH and pathological mutants disrupt this electrostatic network and how this broken network destabilizes PrP structure. To do so, we performed a temperature-based replica-exchange molecular dynamics (T-REMD) simulation using a cumulative 252 μs simulation time. We measured the distance between amino acids comprising four salt bridges (R156–E196/D202 and H187–E196/D202). Our results showed that the spatial configuration of the electrostatic network was significantly altered by an acidic pH and mutations. The structural alteration in the electrostatic network increased the RMSF value around the first helix (H1). Thus, the structural stability of H1, which is anchored to the H2–H3 bundle, was decreased. It induces separation of R156 from the electrostatic network. Analysis of the anchoring energy also shows that two salt-bridges (R156-E196/D202) are critical for PrP stability.
Highlights
A conformational change from normal prion protein(PrPC) to abnormal prion protein(PrPSC) induces fatal neurodegenerative diseases
The NMR structure of human PrP shows that the protonation of H187 can destabilize the R156–E196 salt bridge and that D202 is close enough to interact with R156 and H1873
The H187R mutant was reported in the classical form of Gerstmann-Sträussler-Scheinker in an American family[17,18], the E196A mutant has been associated with Creutzfeldt-Jakob disease[19], and D202N was linked to atypical Gerstmann-Sträussler-Scheinker with Alzheimer’s disease-like phenotypes[20]
Summary
A conformational change from normal prion protein(PrPC) to abnormal prion protein(PrPSC) induces fatal neurodegenerative diseases. The three main causes of prion diseases are infection, genetic mutations, and unknown reasons related to sporadic disorders[4,5] These three factors lead to PrP destabilization, which induces a conformational change from the normal cellular isoform (PrPC) to a misfolded isoform (PrPSC). The H187R mutant was reported in the classical form of Gerstmann-Sträussler-Scheinker in an American family[17,18], the E196A mutant has been associated with Creutzfeldt-Jakob disease[19], and D202N was linked to atypical Gerstmann-Sträussler-Scheinker with Alzheimer’s disease-like phenotypes[20] These pathological mutants affect the electrostatic balance, which is critical for the structural stability of PrP. This exposed hydrophobic core critically decreases the structural stability of PrP
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