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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

693
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...
693

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Xplor-NIH: Better parameters and protocols for NMR protein structure determination.

Guillermo A Bermejo1, Nico Tjandra2, G Marius Clore1

  • 1Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, USA.

Protein Science : a Publication of the Protein Society
|March 19, 2024
PubMed
Summary

This study updates Xplor-NIH parameters for protein structure determination, improving accuracy and validation. Enhanced protein models derived from nuclear magnetic resonance data show superior performance.

Keywords:
NMR restraintsXplor-NIHproteinstructure determination

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Area of Science:

  • Biomolecular structure determination
  • Computational biology
  • Structural bioinformatics

Background:

  • Accurate protein structure determination is crucial for understanding biological function.
  • Existing computational packages require continuous refinement of parameters for improved accuracy.
  • Xplor-NIH is a widely used package for biomolecular structure calculations.

Purpose of the Study:

  • To update protein covalent geometry and atomic radii parameters in Xplor-NIH.
  • To enhance the accuracy and validation of protein structures determined using Xplor-NIH.
  • To assess the performance of the updated Xplor-NIH package against previous versions and experimental models.

Main Methods:

  • Updated Xplor-NIH package with new covalent geometry and atomic radii parameters.
  • Incorporated improved treatment for non-bonded interactions and a gyration volume term.
  • Performed structure calculations on 30 proteins using nuclear magnetic resonance (NMR) restraints.
  • Validated structures using modern criteria, including Protein Data Bank standards.

Main Results:

  • The updated Xplor-NIH parameters demonstrate superior performance in structure calculations.
  • Structures determined with the new parameters show improved accuracy and validation metrics.
  • Xplor-NIH-derived structures favorably compare with original NMR models.
  • Enhanced treatment of specific non-bonded interactions improved results.

Conclusions:

  • The updated Xplor-NIH parameters significantly enhance the accuracy of protein structure determination.
  • The refined package provides more reliable biomolecular models from NMR data.
  • This work contributes to advancing computational approaches in structural biology.