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Artikis, Efrosini; Roy, Amitava; Verli, Hugo; Cordeiro, Yraima; Caughey, Byron
ACS chemical neuroscience, 12/2020, Letnik: 11, Številka: 24Journal Article
Although prion protein fibrils can have either parallel-in-register intermolecular β-sheet (PIRIBS) or, probably, β-solenoid architectures, the plausibility of PIRIBS architectures for the usually glycosylated natural prion strains has been questioned based the expectation that such glycans would not fit if stacked in-register on each monomer within a fibril. To directly assess this issue, we have added N-linked glycans to a recently reported cryo-electron microscopy-based human prion protein amyloid model with a PIRIBS architecture and performed in silico molecular dynamics studies to determine if the glycans can fit. Our results show that triantennary glycans can be sterically accommodated in-register on both N-linked glycosylation sites of each monomer. Additional simulations with an artificially mutated β-solenoid model confirmed that glycans can be accommodated when aligned with ∼4.8 Å spacing on every rung of a fibril. Altogether, we conclude that steric intermolecular clashes between glycans do not, in themselves, preclude PIRIBS architectures for prions.
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