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Related Concept Videos

Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
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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...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

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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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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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MD2NMR: Linking molecular dynamics with NMR relaxation.

Houfang Zhang1, Tiejun Wei2, Anna R Panchenko3

  • 1Institute of Biophysics and Department of Physics, Central China Normal University, Wuhan, China.

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|April 10, 2026
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Summary

MD2NMR is a new Python tool that calculates nuclear magnetic resonance (NMR) relaxation parameters from molecular dynamics (MD) simulations. It accurately predicts relaxation rates and correlation times, validating atomistic simulations.

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Area of Science:

  • Computational Chemistry
  • Biophysics
  • Molecular Dynamics

Background:

  • Accurate prediction of NMR relaxation parameters from MD simulations is crucial for linking molecular motions to experimental data.
  • Existing methods may lack efficiency or broad applicability for diverse biomolecular systems.

Purpose of the Study:

  • Introduce MD2NMR, an open-source Python framework for calculating NMR relaxation parameters (R1, R2, τc) from MD trajectories.
  • Provide a flexible and user-friendly tool for validating MD simulations.

Main Methods:

  • MD2NMR implements efficient algorithms for time correlation and spectral density functions, accounting for global and internal motions.
  • The framework supports multiple trajectory formats and user-defined parameters.
  • Calculations include longitudinal (R1) and transverse (R2) relaxation rates, and rotational correlation times (τc).

Main Results:

  • MD2NMR accurately reproduces experimental NMR relaxation behavior for ubiquitin, GB1, GB3, and histone H3/H4 tails.
  • Achieved high Pearson correlation coefficients (up to 0.89) and low RMSE (0.75) for small systems.
  • Demonstrated good accuracy for histone H3 tail rotational correlation times (PCC up to 0.79, RMSE 6.08) with computational efficiency.

Conclusions:

  • MD2NMR offers a robust platform for validating MD simulations by accurately predicting NMR relaxation parameters.
  • The framework's flexibility and accuracy make it extensible to various biomolecular systems.
  • MD2NMR is freely available as an open-source Python package, promoting wider adoption and research.