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Related Concept Videos

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Simulated Tempering Distributed Replica Sampling, Virtual Replica Exchange, and Other Generalized-Ensemble Methods

Sarah Rauscher1, Chris Neale1, Régis Pomès1

  • 1Molecular Structure and Function, Hospital for Sick Children, 555 University Avenue, Toronto, ON, Canada M5G 1X8 and Department of Biochemistry, University of Toronto, 1 King's College Circle, Toronto, ON, Canada M5S 1A8.

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Summary
This summary is machine-generated.

Two new methods, simulated tempering distributed replica sampling (STDR) and virtual replica exchange (VREX), enhance biomolecular simulations. STDR and VREX offer faster conformational sampling and structural convergence, especially for complex systems, compared to traditional algorithms.

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Area of Science:

  • Computational Chemistry
  • Biophysics
  • Molecular Dynamics

Background:

  • Generalized-ensemble algorithms enhance conformational sampling in biomolecular simulations by random walks in temperature.
  • Existing methods like replica exchange (RE), simulated tempering (ST), and serial replica exchange (SREM) face challenges with computational resources and initial simulation requirements.

Purpose of the Study:

  • Introduce two novel methods: simulated tempering distributed replica sampling (STDR) and virtual replica exchange (VREX).
  • Address practical limitations of existing algorithms (RE, ST, SREM) for enhanced sampling.
  • Objectively compare the performance of five algorithms (RE, ST, SREM, STDR, VREX) in terms of implementation and sampling efficiency.

Main Methods:

  • Developed and implemented STDR and VREX algorithms.
  • Performed extensive molecular dynamics simulations (over 42 μs) of disordered peptides in explicit water.
  • Compared STDR, VREX, RE, ST, and SREM based on structural convergence and temperature diffusion metrics.

Main Results:

  • STDR and VREX reduce the need for lengthy initial simulations and extensive inter-replica communication.
  • ST-based methods demonstrate faster temperature diffusion and structural convergence than RE-based methods.
  • Within RE-based methods, VREX outperforms SREM and RE in efficiency.

Conclusions:

  • STDR and VREX are suitable for distributed or heterogeneous computing platforms.
  • Simulated tempering (ST) is ideal for simple systems, while STDR is well-suited for complex systems.
  • The study provides a comprehensive comparison aiding the selection of appropriate enhanced sampling algorithms.