Hormaomycin is an intercellular signal substance, whose sequence and constitution could be elucidated by a combination of degradation reactions and mass spectrometric and NMR spectroscopic investigations. Hormaomycin is a peptide lactone, which, in addition to containing three known amino acids, allo-threonine, isoleucine and (3-methyl)phenylalanine, also contains two new amino acids: 4-[(Z)-propenyl]proline and 3-(2-nitrocyclopropylalanine). Signal substances such as 1 are gaining increasing importance for insights into microbial secondary metabolism.
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Rössner et al. (1990) studied this question.
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