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Great Offset Difference Internuclear Selective Transfer.

Evgeny Nimerovsky1, Eszter Éva Najbauer1, Stefan Becker1

  • 1Department of NMR-based Structural Biology, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Göttingen 37077, Germany.

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|April 20, 2023
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Summary
This summary is machine-generated.

We developed a new pulse sequence, GODIST, for faster and more selective nuclear magnetic resonance (NMR) experiments. This method enhances the detection of connections between atoms in proteins, improving structural analysis.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Biophysical Chemistry
  • Structural Biology

Background:

  • Magic-angle spinning (MAS) NMR is crucial for studying biomolecular structures.
  • Current recoupling sequences often lack selectivity, limiting their ability to detect long-range or inter-residue correlations.
  • Fast MAS NMR requires robust and efficient recoupling methods.

Purpose of the Study:

  • To introduce and optimize a novel selective recoupling sequence, GODIST, for fast MAS NMR.
  • To enhance the detection of inter-residue and long-range correlations in proteins.
  • To improve signal intensity and spectral resolution in complex biological samples.

Main Methods:

  • Development and implementation of the Great Offset Difference Internuclear Selective Transfer (GODIST) pulse sequence.
  • Optimization of GODIST for selective carbonyl or aliphatic recoupling at 55 kHz MAS.
  • Application of GODIST to perdeuterated microcrystalline SH3 and the influenza A M2 membrane protein in lipid bilayers.
  • Acquisition of 3D (H)COCO(N)H and (H)CO(CO)NH spectra for structural analysis.

Main Results:

  • GODIST achieved a 3- to 5-fold increase in signal intensity compared to broadband RFDR recoupling.
  • Selective recoupling of carbonyl or aliphatic sites was successfully demonstrated.
  • Inter-residue carbonyl-carbonyl correlations up to approximately 5 Å were observed in uniformly 13C-labeled proteins.
  • Enhanced spectral quality for both model proteins and membrane proteins.

Conclusions:

  • The GODIST pulse sequence significantly improves sensitivity and selectivity in fast MAS NMR.
  • GODIST enables more efficient detection of long-range and inter-residue contacts in proteins.
  • This method advances the structural elucidation of biomolecules, including membrane proteins.