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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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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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Related Experiment Video

Updated: Mar 8, 2026

Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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SimLabel: a graphical user interface to simulate continuous wave EPR spectra from site-directed spin labeling

E Etienne1, N Le Breton1,2, M Martinho1

  • 1Aix Marseille Univ, CNRS, BIP (UMR 7281), IMM (FR 3479), Marseille, France.

Magnetic Resonance in Chemistry : MRC
|January 13, 2017
PubMed
Summary

A new graphical user interface, SimLabel, simplifies continuous wave electron paramagnetic resonance (cw EPR) spectral simulations for site-directed spin labeling (SDSL) experiments. This tool aids researchers in analyzing protein dynamics and structural changes.

Keywords:
EPREasySpingraphical user interfacesimulationsite-directed spin labeling

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Area of Science:

  • Biophysics
  • Structural Biology
  • Spectroscopy

Background:

  • Site-directed spin labeling (SDSL) coupled with continuous wave electron paramagnetic resonance (cw EPR) spectroscopy is vital for residue-level protein structural analysis.
  • Quantitative interpretation of SDSL-EPR spectra necessitates accurate numerical simulations, which can be challenging for non-expert users of tools like MATLAB's EasySpin toolbox.

Purpose of the Study:

  • To develop an intuitive graphical user interface (GUI) for simulating cw EPR spectra, specifically for SDSL-EPR applications.
  • To lower the barrier for researchers to perform and interpret complex spectral simulations.

Main Methods:

  • Development of a user-friendly GUI named SimLabel.
  • Implementation of cw EPR spectral simulation capabilities within SimLabel.
  • Demonstration using an example of an intrinsically disordered protein region undergoing induced folding.

Main Results:

  • SimLabel provides an accessible platform for visualizing, simulating, and fitting cw EPR spectra.
  • The tool facilitates the rapid generation of reliable simulated spectra for SDSL-EPR data.
  • Successful simulation of an intrinsically disordered protein region's folding transition was achieved.

Conclusions:

  • SimLabel enhances the usability of cw EPR spectral simulations for SDSL experiments.
  • The tool is expected to accelerate the analysis and interpretation of protein dynamics and structural changes.
  • SimLabel empowers researchers, particularly those less experienced with simulation software, to gain deeper insights from their experimental data.