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Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred to as...
Temperature Dependence on Reaction Rate02:55

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The Collision Theory
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The Arrhenius equation,
Temperature Dependent Deformation01:12

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Exploring Caspase Mutations and Post-Translational Modification by Molecular Modeling Approaches
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Thermostat artifacts in replica exchange molecular dynamics simulations.

Edina Rosta1, Nicolae-Viorel Buchete, Gerhard Hummer

  • 1Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, U.S.A., and School of Physics, University College Dublin, Belfield, Dublin 4, Ireland.

Journal of Chemical Theory and Computation
|January 5, 2010
PubMed
Summary

Using non-canonical thermostats in replica exchange molecular dynamics (REMD) simulations distorts results. Canonical ensemble thermostats are essential for accurate simulations of molecular systems like proteins.

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Published on: November 21, 2017

Area of Science:

  • Computational Chemistry
  • Molecular Dynamics Simulations
  • Statistical Mechanics

Background:

  • Replica Exchange Molecular Dynamics (REMD) is a powerful simulation technique for exploring complex energy landscapes.
  • Thermostats are crucial for maintaining temperature control in molecular dynamics simulations.
  • Canonical ensemble simulations are the standard for reproducing experimental thermodynamic properties.

Purpose of the Study:

  • To investigate the impact of different thermostats on REMD simulations.
  • To determine if non-canonical thermostats affect the accuracy of REMD results.
  • To assess the consequences for both bulk systems and biomolecular simulations.

Main Methods:

  • Performed REMD simulations using both canonical and non-canonical thermostats (specifically, weak-coupling Berendsen thermostat).
  • Analyzed configuration-space distributions, potential energy distributions, and inter-replica energy correlations.
  • Simulated bulk water and a helix-forming peptide to evaluate effects on different systems.

Main Results:

  • Non-canonical thermostats distort configuration-space distributions in REMD.
  • Observed deviations in average potential energies, broadened energy tails, and artificial correlations in bulk water simulations.
  • Demonstrated altered conformational equilibrium for a helix-forming peptide, leading to inaccurate folding enthalpy calculations.

Conclusions:

  • Thermostats that do not produce a canonical ensemble introduce significant errors in REMD simulations.
  • These errors can bias conformational sampling and lead to incorrect thermodynamic properties.
  • REMD simulations must exclusively use thermostats that generate a canonical ensemble for reliable results.