Using Markov models to simulate electron spin resonance spectra from molecular dynamics trajectories.

Using Markov models to simulate electron spin resonance spectra from molecular dynamics trajectories.
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DOI:
10.1021/jp801608v
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发表时间:
2008-09-04
影响因子:
3.3
通讯作者:
Roux, Benoit
Roux, Benoit
中科院分区:
化学3区
文献类型:
--
作者:
Sezer, Deniz;Freed, Jack H.;Roux, Benoit

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Simulating electron spin resonance (ESR) spectra directly from molecular dynamics simulations of a spin labeled protein necessitates a large number (hundreds or thousands) of relatively long (hundreds of ns) trajectories. To meet this challenge, we explore the possibility of constructing accurate stochastic models of the spin label dynamics from atomistic trajectories. A systematic, two-step procedure, based on the probabilistic framework of hidden Markov models, is developed to build a discrete-time Markov chain process that faithfully captures the internal spin label dynamics on time scales longer than about 150 ps. The constructed Markov model is used both to gain insight into the long-lived conformations of the spin label and to generate the stochastic trajectories required for the simulation of ESR spectra. The methodology is illustrated with an application to the case of a spin labeled poly-alanine alpha helix in explicit solvent.
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