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Past–future information bottleneck for sampling molecular reaction coordinate simultaneously with thermodynamics and kinetics
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Past–future information bottleneck for sampling molecular reaction coordinate simultaneously with thermodynamics and kinetics
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Past–future information bottleneck for sampling molecular reaction coordinate simultaneously with thermodynamics and kinetics
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Journal Article
Past–future information bottleneck for sampling molecular reaction coordinate simultaneously with thermodynamics and kinetics
2019
Overview
The ability to rapidly learn from high-dimensional data to make reliable bets about the future is crucial in many contexts. This could be a fly avoiding predators, or the retina processing gigabytes of data to guide human actions. In this work we draw parallels between these and the efficient sampling of biomolecules with hundreds of thousands of atoms. For this we use the Predictive Information Bottleneck framework used for the first two problems, and re-formulate it for the sampling of biomolecules, especially when plagued with rare events. Our method uses a deep neural network to learn the minimally complex yet most predictive aspects of a given biomolecular trajectory. This information is used to perform iteratively biased simulations that enhance the sampling and directly obtain associated thermodynamic and kinetic information. We demonstrate the method on two test-pieces, studying processes slower than milliseconds, calculating free energies, kinetics and critical mutations.
Efficient sampling of rare events in all-atom molecular dynamics simulations remains a challenge. Here, the authors adapt the Predictive Information Bottleneck framework to sample biomolecular structure and dynamics through iterative rounds of biased simulations and deep learning.
