Influence of electric field on the amyloid-β(29-42) peptides embedded in a membrane bilayer.

TitleInfluence of electric field on the amyloid-β(29-42) peptides embedded in a membrane bilayer.
Publication TypeJournal Article
Year of Publication2018
AuthorsLu Y, Shi X-F, Salsbury FR, Derreumaux P
JournalJ Chem Phys
Volume148
Issue4
Pagination045105
Date Published2018 Jan 28
ISSN1089-7690
Abstract

Alzheimer's disease is linked to various types of aggregates of amyloid-β (Aβ) peptide and their interactions with protein receptors and neuronal cell membranes. Little is known on the impact of the electric field on membrane-embedded Aβ. Here we use atomistic molecular dynamics simulations to study the effects of a constant electric field on the conformations of Aβdimer inside a membrane, where the electric field has a strength of 20 mV/nm which exists across the membrane of a human neuron. Starting from α-helix peptides, the transmembrane electric field (TMEF) accelerates the conversion from the Gly-out substate to the Gly-side and Gly-in substates. Starting from β-sheet peptides, TMEF induces changes of the kink and tilt angles at Gly33 and Gly37. Overall, in the simulations totaling 10 μs, TMEF establishes new ground states for the dimer, similar to induced-fit in ligand binding. Our findings indicate that TMEF can stabilize rare conformations of amyloid peptides, and this could influence the cleavage of the amyloid precursor protein and the formation of β-sheet oligomers in membrane bilayers.

DOI10.1063/1.5018459
Alternate JournalJ Chem Phys
Citation Key2018|2034
PubMed ID29390813