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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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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Improving NMR protein structure quality by Rosetta refinement: a molecular replacement study.

Theresa A Ramelot1, Srivatsan Raman, Alexandre P Kuzin

  • 1Department of Chemistry and Biochemistry and Northeast Structural Genomics Consortium, Miami University, Oxford, Ohio 45056, USA.

Proteins
|September 26, 2008
PubMed
Summary
This summary is machine-generated.

Refining nuclear magnetic resonance (NMR) structures with Rosetta improved molecular replacement (MR) performance by enhancing protein structure quality and hydrogen bonding. This approach aids in accurate structure determination and analysis.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Computational Biology

Background:

  • Determining human protein HSPC034 structure using solution nuclear magnetic resonance (NMR) spectroscopy and X-ray crystallography.
  • Investigating methods to improve NMR structure quality and molecular replacement (MR) performance.

Purpose of the Study:

  • To evaluate the impact of Rosetta refinement on NMR structure quality and MR performance.
  • To compare the effectiveness of different NMR structure calculation methods.
  • To identify factors limiting MR performance in NMR structures.

Main Methods:

  • Structure determination of HSPC034 via NMR spectroscopy and X-ray crystallography.
  • Refinement of NMR structures using the Rosetta protocol, with and without NMR restraints.
  • Comparison of MR performance using MOLREP and Phaser.
  • Analysis of hydrogen bonding and conformational sampling in refined structures.

Main Results:

  • Rosetta refinement of NMR structures significantly improved structure quality and MR performance.
  • Standard NMR refinement methods (DYANA, CYANA, XPLOR-NIH, CNSw) showed varying improvements in RMSD and MR performance.
  • Rosetta identified alternative low-energy conformations consistent with NMR data.
  • Inferior hydrogen bonding in standard NMR structures was identified as a key factor limiting MR performance.

Conclusions:

  • Rosetta refinement offers a superior approach for improving NMR structure quality and MR performance.
  • Accurate hydrogen bond identification and network representation are critical for effective NMR structure refinement.
  • Incorporating non-bivalent hydrogen bonds from Rosetta into NMR structure calculations enhances MR performance.