Natural-abundance 15N NMR studies of Turkey ovomucoid third domain. Assignment of peptide 15N resonances to the residues at the reactive site region via proton-detected multiple-quantum coherence

Gilberto Ortiz-Polo, R. Krishnamoorthi, John L. Markley, David H. Live, Donald G. Davis, David Cowburn

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Heteronuclear two-dimensional 1H{15N} multiple-quantum (MQ) spectroscopy has been applied to a protein sample at natural abundance: ovomucoid third domain from turkey (Meleagris gallopavo), a serine proteinase inhibitor of 56 amino acid residues. Peptide amide 1H NMR assignments obtained by two-dimensional 1H{1H} NMR methods (R. Krishnamoorthi and J. L. Markley, unpublished data) led to identification of the corresponding 1H{15N} MQ coherence cross peaks. From these, 15N NMR chemical shifts were determined for several specific backbone amide groups of amino acid residues located around the reactive site region of the inhibitor. The results suggest that amide 15N chemical shifts, which are readily obtained in this way, may serve as sensitive probes for conformational studies of proteins.

Original languageEnglish (US)
Pages (from-to)303-310
Number of pages8
JournalJournal of Magnetic Resonance (1969)
Issue number2
Publication statusPublished - Jun 15 1986
Externally publishedYes


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