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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...
995

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Adaptive lambda square dynamics simulation: an efficient conformational sampling method for biomolecules.

Jinzen Ikebe1, Shun Sakuraba, Hidetoshi Kono

  • 1Molecular Modeling and Simulation Group, Japan Atomic Energy Agency, 8-1-7 Umemidai, Kizugawa, Kyoto, 619-0215, Japan.

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|October 30, 2013
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Summary
This summary is machine-generated.

A new adaptive lambda square dynamics (ALSD) method significantly improves biomolecular conformational sampling efficiency. This novel approach overcomes limitations of partial multicanonical molecular dynamics, enhancing generalized ensemble simulations.

Keywords:
all-atom modelexplicit waterfree energy landscapegeneralized ensemble methodpartial system

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Area of Science:

  • Computational Chemistry
  • Biophysics
  • Molecular Dynamics

Background:

  • Generalized ensemble (GE) methods enhance molecular simulations.
  • Partial GE methods (GEPS) focus sampling on specific system parts.
  • Partial multicanonical molecular dynamics (McMD) showed limitations in prior testing.

Purpose of the Study:

  • To investigate the poor performance of partial McMD for biomolecules.
  • To develop a novel, improved GEPS method.
  • To enhance conformational sampling efficiency for complex biomolecular systems.

Main Methods:

  • Elucidation of the fundamental reasons behind partial McMD's inefficiency.
  • Development and implementation of adaptive lambda square dynamics (ALSD).
  • Comparative analysis of ALSD against conventional GE and partial McMD.

Main Results:

  • Partial McMD demonstrated significantly worse sampling efficiency than conventional GE for polylysine decapeptide.
  • ALSD was developed to address and resolve the identified issues with partial McMD.
  • ALSD demonstrated a substantial increase in sampling efficiency compared to conventional GE.

Conclusions:

  • ALSD effectively resolves limitations of partial McMD for biomolecular simulations.
  • The proposed ALSD method offers greatly increased conformational sampling efficiency.
  • ALSD is a promising technique applicable to larger and more complex biomolecular systems.