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Title: Designing Free Energy Surfaces That Match Experimental Data with Metadynamics

Journal Article · · Journal of Chemical Theory and Computation
 [1];  [1];  [1]
  1. Univ. of Chicago, IL (United States). James Franck Inst. and Inst. for Biophysical Dynamics and Computation Inst.; Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Nonlinear Studies

Creating models that are consistent with experimental data is essential in molecular modeling. This is often done by iteratively tuning the molecular force field of a simulation to match experimental data. An alternative method is to bias a simulation, leading to a hybrid model composed of the original force field and biasing terms. Previously we introduced such a method called experiment directed simulation (EDS). EDS minimally biases simulations to match average values. We also introduce a new method called experiment directed metadynamics (EDM) that creates minimal biases for matching entire free energy surfaces such as radial distribution functions and phi/psi angle free energies. It is also possible with EDM to create a tunable mixture of the experimental data and free energy of the unbiased ensemble with explicit ratios. EDM can be proven to be convergent, and we also present proof, via a maximum entropy argument, that the final bias is minimal and unique. Examples of its use are given in the construction of ensembles that follow a desired free energy. Finally, the example systems studied include a Lennard-Jones fluid made to match a radial distribution function, an atomistic model augmented with bioinformatics data, and a three-component electrolyte solution where ab initio simulation data is used to improve a classical empirical model.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1329576
Report Number(s):
LA-UR-15-21325
Journal Information:
Journal of Chemical Theory and Computation, Vol. 11, Issue 6; ISSN 1549-9618
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Cited By (15)

Advanced simulation techniques for the thermodynamic and kinetic characterization of biological systems journal January 2018
Using the Maximum Entropy Principle to Combine Simulations and Solution Experiments journal February 2018
Bayesian-Maximum-Entropy Reweighting of IDP Ensembles Based on NMR Chemical Shifts journal September 2019
Rigorous force field optimization principles based on statistical distance minimization journal October 2015
SAXS-guided Enhanced Unbiased Sampling for Structure Determination of Proteins and Complexes journal December 2018
Reweighting ensemble probabilities with experimental histogram data constraints using a maximum entropy principle journal December 2018
Combining enhanced sampling with experiment-directed simulation of the GYG peptide journal May 2018
Bayesian ensemble refinement by replica simulations and reweighting journal December 2015
Integrative Approaches in Structural Biology: A More Complete Picture from the Combination of Individual Techniques journal August 2019
Bayesian ensemble refinement by replica simulations and reweighting text January 2015
Combining Enhanced Sampling with Experiment Directed Simulation of the GYG peptide text January 2018
RNA Structural Dynamics As Captured by Molecular Simulations: A Comprehensive Overview journal January 2018
Efficient Ensemble Refinement by Reweighting journal April 2019
Unified Approach to Enhanced Sampling journal November 2020
Principles of protein structural ensemble determination. journalarticle January 2017

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