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2016 ; 6
(ä): 33156
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An Atomistic View of Amyloidogenic Self-assembly: Structure and Dynamics of
Heterogeneous Conformational States in the Pre-nucleation Phase
#MMPMID27616019
Matthes D
; Gapsys V
; Brennecke JT
; de Groot BL
Sci Rep
2016[Sep]; 6
(ä): 33156
PMID27616019
show ga
The formation of well-defined filamentous amyloid structures involves a
polydisperse collection of oligomeric states for which relatively little is known
in terms of structural organization. Here we use extensive, unbiased explicit
solvent molecular dynamics (MD) simulations to investigate the structural and
dynamical features of oligomeric aggregates formed by a number of highly
amyloidogenic peptides at atomistic resolution on the ?s time scale. A consensus
approach has been adopted to analyse the simulations in multiple force fields,
yielding an in-depth characterization of pre-fibrillar oligomers and their global
and local structure properties. A collision cross section analysis revealed
structurally heterogeneous aggregate ensembles for the individual oligomeric
states that lack a single defined quaternary structure during the pre-nucleation
phase. To gain insight into the conformational space sampled in early aggregates,
we probed their substructure and found emerging ?-sheet subunit layers and a
multitude of ordered intermolecular ?-structure motifs with growing aggregate
size. Among those, anti-parallel out-of-register ?-strands compatible with toxic
?-barrel oligomers were particularly prevalent already in smaller aggregates and
formed prior to ordered fibrillar structure elements. Notably, also distinct
fibril-like conformations emerged in the oligomeric state and underscore the
notion that pre-nucleated oligomers serve as a critical intermediate step
on-pathway to fibrils.