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Global Dynamics of Yeast Hsp90 Middle and C-Terminal Dimer Studied by Advanced Sampling Simulations.

Authors :
Kandzia F
Ostermeir K
Zacharias M
Source :
Frontiers in molecular biosciences [Front Mol Biosci] 2019 Sep 27; Vol. 6, pp. 93. Date of Electronic Publication: 2019 Sep 27 (Print Publication: 2019).
Publication Year :
2019

Abstract

The Hsp90 protein complex is one of the most abundant molecular chaperone proteins that assists in folding of a variety of client proteins. During its functional cycle it undergoes large domain rearrangements coupled to the hydrolysis of ATP and association or dissociation of domain interfaces. In order to better understand the domain dynamics comparative Molecular Dynamics (MD) simulations of a sub-structure of Hsp90, the dimer formed by the middle (M) and C-terminal domain (C), were performed. Since this MC dimer lacks the ATP-binding N-domain it allows studying global motions decoupled from ATP binding and hydrolysis. Conventional (c)MD simulations starting from several different closed and open conformations resulted in only limited sampling of global motions. However, the application of a Hamiltonian Replica exchange (H-REMD) method based on the addition of a biasing potential extracted from a coarse-grained elastic network description of the system allowed much broader sampling of domain motions than the cMD simulations. With this multiscale approach it was possible to extract the main directions of global motions and to obtain insight into the molecular mechanism of the global structural transitions of the MC dimer.<br /> (Copyright © 2019 Kandzia, Ostermeir and Zacharias.)

Details

Language :
English
ISSN :
2296-889X
Volume :
6
Database :
MEDLINE
Journal :
Frontiers in molecular biosciences
Publication Type :
Academic Journal
Accession number :
31681792
Full Text :
https://doi.org/10.3389/fmolb.2019.00093