ISOLATION OF CEPAFUNGINS I, II AND III FROM PSEUDOMONAS SPECIES

Abstract

New acylpeptide antibiotics named cepafungins I, II and III were isolated from the culture broth of a strain identified as Pseudomonas sp. These antibiotics are neutral substances, soluble in aqueous alcohols and dimethyl sulfoxide, and show UV maxima at 260.5nm. The IR spectra indicated these to be peptides. Molecular formulas C₂₈H₄₆N₄O₆, C₂₇H₄₄N₄O₆ and C₂₆H₄₂N₄O₆ for cepafungins I, II and III were indicated by elemental analysis and SI-MS. Cepafungins exhibited inhibitory activity against yeast and fungi, and antitumor activity against P388 leukemia in mice.