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Assignment of proton and carbon NMR signals of didemnin A in solution

✍ Scribed by H. Kessler; M. Will; G. M. Sheldrick; J. Antel

Publisher: John Wiley and Sons
Year: 1988
Tongue: English
Weight: 440 KB
Volume: 26
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260260613

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✦ Synopsis

Several one-and two-dimensional techniques have been used to assign the 'H and "C NMR spectra of the cyclic heptadepsipeptide didemnin A in DMSO. The composition and sequence of the amino acid residues was known beforehand and could be confirmed by heteronuclear proton-carbon long-range couplings using the COLOC experiment and a recently proposed new inverse technique using Gaussian-shaped pulses. The aliphatic methyl resonances of the isostatin, hydroxyisovalerylpropionyl, N-methylleucine and leucine residues were assigned by means of the TOCSY and NOESY techniques. Aliphatic carbon assignment was performed by inverse correlation via heteronuclear double quantum coherence. KEY WORDS Cyclic depsipeptide Inverse COLOC Inverse HMQC Semi-selective excitation NMR assignments in peptides Didemnin

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