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• W2034696427 endingPage "e68023" @default.
• W2034696427 startingPage "e68023" @default.
• W2034696427 abstract "Adenylate kinase (AdK) is a phosphoryl-transfer enzyme with important physiological functions. Based on a ligand-free open structure and a ligand-bound closed structure solved by crystallography, here we use molecular dynamics simulations to examine the stability and dynamics of AdK conformations in the absence of ligands. We first perform multiple simulations starting from the open or the closed structure, and observe their free evolutions during a simulation time of 100 or 200 nanoseconds. In all seven simulations starting from the open structure, AdK remained stable near the initial conformation. The eight simulations initiated from the closed structure, in contrast, exhibited large variation in the subsequent evolutions, with most (seven) undergoing large-scale spontaneous conformational changes and approaching or reaching the open state. To characterize the thermodynamics of the transition, we propose and apply a new sampling method that employs a series of restrained simulations to calculate a one-dimensional free energy along a curved pathway in the high-dimensional conformational space. Our calculated free energy profile features a single minimum at the open conformation, and indicates that the closed state, with a high (∼13 kcal/mol) free energy, is not metastable, consistent with the observed behaviors of the unrestrained simulations. Collectively, our simulations suggest that it is energetically unfavorable for the ligand-free AdK to access the closed conformation, and imply that ligand binding may precede the closure of the enzyme." @default.
• W2034696427 created "2016-06-24" @default.
• W2034696427 creator A5049572208 @default.
• W2034696427 creator A5079002066 @default.
• W2034696427 date "2013-07-05" @default.
• W2034696427 modified "2023-09-27" @default.
• W2034696427 title "Conformational Dynamics of a Ligand-Free Adenylate Kinase" @default.
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• W2034696427 doi "https://doi.org/10.1371/journal.pone.0068023" @default.
• W2034696427 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3702565" @default.
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• W2034696427 hasPublicationYear "2013" @default.
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