Landomycins, new angucycline antibiotics from streptomyces sp. I. Structural studies on landomycins A~D

Thomas Henkel, Jürgen Rohr, John M. Beale, Ludger Schwenen

Research output: Contribution to journalArticlepeer-review

119 Scopus citations

Abstract

The chemical structure of the new angucycline antibiotic landomycin A has been elucidated via chemical and spectroscopic methods, in particular by 2D NMR correlation spectroscopy, e.g., 1H, 1H-COSY, 13C, 1H-COSY, correlation spectroscopy via long-range-couplings and heteronuclear multiple bond connectivity spectroscopy sequences. The spectroscopic investigations were carried out principally with the octaacetyl derivative of landomycin A, which is more soluble in organic solvents than landomycin A itself. The structure consists of a new, unusual angucyclinone, landomycinone A, and of six deoxy sugars, four D-olivoses and two L-rhodinoses, which are all assembled in one chain thus forming the sequence (olivose-4→1-olivose-3-→-rhodinose)2. This long sugar chain is bonded as a phenolic glycoside to the aglycone moiety, a unique structural feature among quinone glycoside antibiotics. By comparison with the main component landomycin A, the structures of three minor congeners, namely landomycins B, C and D, could be proposed.

Original languageEnglish
Pages (from-to)492-503
Number of pages12
JournalJournal of Antibiotics
Volume43
Issue number5
DOIs
StatePublished - 1990

ASJC Scopus subject areas

  • Pharmacology
  • Drug Discovery

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