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. 2001 Sep;59(3):125-30.
doi: 10.1002/1097-0282(200109)59:3<125::AID-BIP1012>3.0.CO;2-A.

The (17)O-NMR shielding range and shielding time scale and detection of discrete hydrogen-bonded conformational states in peptides

I P Gerothanassis  1
Affiliations

The (17)O-NMR shielding range and shielding time scale and detection of discrete hydrogen-bonded conformational states in peptides

I P Gerothanassis. Biopolymers. 2001 Sep.

Abstract

The (17)O-NMR shielding range and shielding time scale due to hydrogen-bonding interactions in peptides are critically evaluated relative to those of (1)H-NMR. Furthermore, the assumptions and conclusions in previous (17)O-NMR studies on the detection of discrete conformational states in peptides (V. Tsikaris et al., Biopolymers, 2000, Vol. 53, pp. 135-139) are reconsidered. Consistent examination of the method demonstrates that although (17)O shieldings of peptide oxygens are very sensitive to hydrogen bonding interactions, the (17)O-NMR shielding time scale is not advantageous compared to that of (1)H-NMR, and thus it is not suitable for the detection of discrete hydrogen-bonded conformational states in peptides. (17)O-NMR spectroscopy is prone to interpretation errors due to the formation of (17)O-labeled impurities during the synthetic procedures (A. Steinschneider et al., International Journal of Peptide and Protein Research, 1981, Vol. 18, pp. 324-333).

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