Computational insights into the binding of monolayer-capped gold nanoparticles onto amyloid-? fibrils

Amyloids-? (A?) fibrils are involved in several neurodegenerative diseases. In this study, atomistic molecular dynamics simulations have been used to investigate how monolayer-protected gold nanoparticles interact with A?(1-40) and A?(1-42) fibrils. Our results show that small gold nanoparticles bind with the external side of amyloid-? fibrils that is involved in the fibrillation process. The binding affinity, studied for both kinds of fibrils as a function of the monolayer composition and the nanoparticle diameter, is modulated by hydrophobic interactions and ligand monolayer conformation. Our findings thus show that monolayer-protected nanoparticles are good candidates to prevent fibril aggregation and secondary nucleation or to deliver drugs to specific fibril regions.