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Title: Proton-detected 15N-1H dipolar coupling/1H chemical shift correlation experiment for the measurement of NH distances in biological solids under fast MAS solid-state NMR

Journal Article · · Journal of Magnetic Resonance Open
 [1];  [1];  [2];  [3];  [1]
  1. Indian Inst. of Technology (IIT), Rupnagar (India)
  2. Ames Lab., and Iowa State Univ., Ames, IA (United States)
  3. Institute of Physical and Chemical Research (RIKEN), Yokohama (Japan). RIKEN-JEOL Collaboration Center; JEOL RESONANCE Inc., Tokyo (Japan)

Measurement of distances from dipolar couplings is essential for structural characterization, refinement and validation using the solid-state nuclear magnetic resonance (ssNMR) spectroscopy. Particularly, knowledge about NH dipolar interactions in biological solids is important for understanding the hydrogen (H)-bonding interactions, molecular geometry and spin dynamics. In this regard, we have proposed a proton-detected two-dimensional (2D) 15N-1H dipolar coupling/1H chemical shift correlation experiment using the C-symmetry based windowless recoupling of chemical shift anisotropy (ROCSA) in combination with the DIPSHIFT pulse-based method for the measurement of short NH distances in the isotopically labeled and naturally abundant biological solids at fast magic angle spinning (MAS) rates (40–70 kHz). Our proposed method results in undistorted recoupled 15N-1H dipolar coupling powder lineshapes that are free from the recoupled 1H CSA contributions under the 15N evolution, a feature that is essential for the measurement of NH distances with improved accuracy (± 500 Hz in terms of the NH dipolar couplings). The pulse sequence developed in the present study is also insensitive to the 1H–1H homonuclear dipolar interactions, relaxation effects owing to its constant-time implementation, and t1-noise from the fluctuations in the MAS.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; JSPS KAKENHI; Science and Engineering Research Board (SERB)
Grant/Contract Number:
AC02-07CH11358; ECR/2017/000713; 20K05483; JPMJMI17A2
OSTI ID:
1837758
Report Number(s):
IS-J-10,681
Journal Information:
Journal of Magnetic Resonance Open, Vol. 10-11; ISSN 2666-4410
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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