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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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Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
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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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Extended Sampling of Macromolecular Conformations from Uniformly Distributed Points on Multidimensional Normal Mode

Antoniel A S Gomes1,2,3, Mauricio G S Costa4, Maxime Louet3

  • 1Laboratório de Física Biológica, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-902, Brazil.

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This study introduces distributed points Molecular Dynamics using Normal Modes (dpMDNM), a novel method for comprehensive protein conformational sampling. dpMDNM efficiently explores protein dynamics and function by systematically covering normal mode space.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Structural Biology

Background:

  • Proteins are dynamic and adopt diverse conformations crucial for function.
  • Understanding protein conformational dynamics is essential for biological insight.
  • Normal Modes (NM) analysis offers a robust method for conformational sampling.

Purpose of the Study:

  • To introduce a novel computational approach for comprehensive protein conformational sampling.
  • To systematically explore protein conformational space using combined normal modes.
  • To enhance the understanding of protein dynamics and function.

Main Methods:

  • Developed "distributed points Molecular Dynamics using Normal Modes" (dpMDNM).
  • Generated uniformly oriented NM combined vectors and harmonically restrained structures.
  • Relaxed generated structures using standard molecular dynamics (MD) simulations.
  • Applied dpMDNM to hen egg-white lysozyme and human cytochrome P450 3A4 (CYP3A4).

Main Results:

  • dpMDNM demonstrated efficacy in extensive conformational sampling, especially with more NMs.
  • Generated ensembles showed broad coverage of experimental structures for lysozyme and CYP3A4.
  • The method successfully sampled transient protein states not easily accessible via standard MD.

Conclusions:

  • dpMDNM provides an efficient and rational framework for comprehensive protein conformational sampling.
  • The approach offers valuable insights into the functional aspects of proteins like lysozyme and CYP3A4.
  • This method significantly contributes to understanding protein dynamics and function.