Human PrP (huPrP) is a high-affinity receptor for oligomeric amyloid β (Aβ) protein aggregates. Binding of Aβ oligomers to membrane-anchored huPrP has been suggested trigger neurotoxic cell signaling in Alzheimer’s disease, while an N-terminal soluble fragment can sequester and reduce their toxicity. Synthetic species are known be heterogeneous, dynamic, transient, rendering structural investig...