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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Sensitivity enhancement by sequential data acquisition for 13C-direct detection NMR.

Kyoko Furuita1, Toshihiko Sugiki1, Mika Takamuku1

  • 1Institute for Protein Research, Osaka University, Japan.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|December 7, 2020
PubMed
Summary

New NMR methods enhance 13C-direct detection sensitivity by acquiring anti-phase and in-phase signals. These techniques improve spectral quality for analyzing proteins, including intrinsically disordered ones.

Keywords:
Carbon direct detectionIntrinsically disordered proteinSensitivity enhancementSequential acquisition

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Area of Science:

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

Background:

  • 13C-direct detection NMR offers advantages like slower relaxation and wider chemical shifts but suffers from low sensitivity.
  • Lower gyromagnetic ratio of 13C and virtual decoupling reduce sensitivity in conventional 13C-direct detection experiments.
  • Enhanced sensitivity is crucial for detailed structural analysis, particularly for challenging biomolecules.

Purpose of the Study:

  • To develop novel HCACO-type NMR pulse sequences to improve the sensitivity of 13C-direct detection experiments.
  • To enable sequential or simultaneous acquisition of anti-phase (AP) and in-phase (IP) signals within a single scan or FID.
  • To validate the enhanced sensitivity and effectiveness of the new pulse sequences on amino acids and proteins.

Main Methods:

  • Development of two new HCACO-type pulse sequences for 13C-direct detection NMR.
  • Sequential acquisition of AP and IP signals in one scan, followed by IPAP virtual decoupling.
  • Simultaneous acquisition of AP and IP signals in a single Free Induction Decay (FID).
  • Testing on valine, streptococcal protein G B1 domain (GB1), and α-synuclein.

Main Results:

  • Successfully obtained AP and IP spectra for all tested samples.
  • Achieved effective removal of peak splitting using IPAP virtual decoupling.
  • Demonstrated sensitivity enhancements of 1.43x for valine, 1.26x for GB1, and 1.26x for α-synuclein with sequential acquisition.
  • Showcased sensitivity increases of 1.40x for valine and 1.35x for GB1 with simultaneous acquisition.

Conclusions:

  • The developed HCACO-type pulse sequences significantly enhance the sensitivity of 13C-direct detection NMR.
  • These methods are applicable to other 13C-direct detection experiments measuring one-bond correlations.
  • The improved utility of 13C-direct detection will benefit structural analyses, especially for intrinsically disordered proteins.