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High-field 2D NMR spectroscopy of amanitin isomers

✍ Scribed by T. Pehk; M. Haga; H. Vija; E. Lippmaa

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
924 KB
Volume
27
Category
Article
ISSN
0749-1581

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✦ Synopsis

puiestee 10, Tallinn 2oooO1, USSR The 'H, I3C and "N NMR spectra of a-, 8and y-amanitins and amaninamide were recorded at 11.7 T and analysed by various two-dimensional (2D) NMR spectroscopic techniques. All diastereotopic protons were assigned, and the sidechain conformations and the conformation of the hydroxyproline residue were determined. The observed "N chemical shifts are caused by non-bonded interactions of the peptide nibogens. 'H, I3C and "N data are complementary to each other and show that the conformation of pamanitin is slightly different from that of the other isomers, in accordance with the lower toxicity. The NOESY and carbonyl "C-'H chemical shift diagrams confirm the closeness of the conformations of amanitins in DMSO solution to that of 8-amanitin in the crystalline state.

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