¹⁷O MAS NMR Correlation Spectroscopy at High Magnetic Fields
Author(s)
Keeler, Eric George; Michaelis, Vladimir K.; Colvin, Michael Thomas; Hung, Ivan; Gor’kov, Peter L.; Cross, Timothy A.; Gan, Zhehong; Griffin, Robert Guy; ... Show more Show less
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The structure of two protected amino acids, FMOC-l-leucine and FMOC-l-valine, and a dipeptide, N-acetyl-l-valyl-l-leucine (N-Ac-VL), were studied via one- and two-dimensional solid-state nuclear magnetic resonance (NMR) spectroscopy. Utilizing ¹⁷O magic-angle spinning (MAS) NMR at multiple magnetic fields (17.6–35.2 T/750–1500 MHz for 1H) the ¹⁷O quadrupolar and chemical shift parameters were determined for the two oxygen sites of each FMOC-protected amino acids and the three distinct oxygen environments of the dipeptide. The one- and two-dimensional, ¹⁷O, ¹⁵N–¹⁷O, ¹³C–¹⁷O, and 1H–¹⁷O double-resonance correlation experiments performed on the uniformly ¹³C,¹⁵N and 70% ¹⁷O-labeled dipeptide prove the attainability of ¹⁷O as a probe for structure studies of biological systems. ¹⁵N–¹⁷O and ¹³C–¹⁷O distances were measured via one-dimensional REAPDOR and ZF-TEDOR experimental buildup curves and determined to be within 15% of previously reported distances, thus demonstrating the use of ¹⁷O NMR to quantitate interatomic distances in a fully labeled dipeptide. Through-space hydrogen bonding of N-Ac-VL was investigated by a two-dimensional ¹H-detected ¹⁷O R³-R-INEPT experiment, furthering the importance of ¹⁷O for studies of structure in biomolecular solids.
Date issued
2017-11Department
Massachusetts Institute of Technology. Department of ChemistryJournal
Journal of the American Chemical Society
Publisher
American Chemical Society (ACS)
Citation
Keeler, Eric G. et al. “¹⁷O MAS NMR Correlation Spectroscopy at High Magnetic Fields.” Journal of the American Chemical Society 139, 49 (November 2017): 17953–17963 © 2017 American Chemical Society
Version: Author's final manuscript
ISSN
0002-7863
1520-5126