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. 1992 Jun;61(6):1550–1556. doi: 10.1016/S0006-3495(92)81959-8

Solid-state 13C NMR spectroscopy of a 13C carbonyl-labeled polypeptide

C Wang 1, Q Teng 1, T A Cross 1
PMCID: PMC1260449  PMID: 19431834

Abstract

High resolution structural elucidation of macromolecular structure by solid-state nuclear magnetic resonance requires the preparation of uniformly aligned samples that are isotopically labeled. In addition, to use the chemical shift interaction as a high resolution constraint requires an in situ tensor characterization for each site of interest. For 13C in the peptide backbone, this characterization is complicated by the presence of dipolar coupled 14N from the peptide bond. Here the 13C1-Gly2 site in gramicidin A is studied both as a dry powder and in a fully hydrated lipid bilayer environment. Linewidths reported for the oriented samples are a factor of five narrower than those reported elsewhere, and previous misinterpretations of the linewidths are corrected. The observed frequency from oriented samples is shown to be consistent with the recently determined structure for this site in the gramicidin backbone. It is also shown that, whereas a dipolar coupling between 13C and 14N is apparent in dry preparations of the polypeptide, in a hydrated bilayer the dipolar coupling is absent, presumably due to a `self-decoupling' mechanism.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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