A kinetic ensemble of the Alzheimer's Aβ peptide.

Autor:	Löhr T; Department of Chemistry, University of Cambridge, Cambridge, UK., Kohlhoff K; Google Research, Mountain View, CA, USA., Heller GT; Department of Chemistry, University of Cambridge, Cambridge, UK., Camilloni C; Dipartimento di Bioscienze, Università degli Studi di Milano, Milano, Italy., Vendruscolo M; Department of Chemistry, University of Cambridge, Cambridge, UK. mv245@cam.ac.uk.
Jazyk:	angličtina
Zdroj:	Nature computational science [Nat Comput Sci] 2021 Jan; Vol. 1 (1), pp. 71-78. Date of Electronic Publication: 2021 Jan 14.
DOI:	10.1038/s43588-020-00003-w
Abstrakt:	The conformational and thermodynamic properties of disordered proteins are commonly described in terms of structural ensembles and free energy landscapes. To provide information on the transition rates between the different states populated by these proteins, it would be desirable to generalize this description to kinetic ensembles. Approaches based on the theory of stochastic processes can be particularly suitable for this purpose. Here, we develop a Markov state model and apply it to determine a kinetic ensemble of Aβ42, a disordered peptide associated with Alzheimer's disease. Through the Google Compute Engine, we generated 315-µs all-atom molecular dynamics trajectories. Using a probabilistic-based definition of conformational states in a neural network approach, we found that Aβ42 is characterized by inter-state transitions on the microsecond timescale, exhibiting only fully unfolded or short-lived, partially folded states. Our results illustrate how kinetic ensembles provide effective information about the structure, thermodynamics and kinetics of disordered proteins. (© 2021. The Author(s), under exclusive licence to Springer Nature America, Inc.)
Databáze:	MEDLINE
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