Abstract
A manumycin-type antibiotic, SW-B, has been isolated from the solid agar culture of Streptomyces flaveus strain A-11. The structure was determined by mass spectrometry and one- and two-dimensional NMR spectroscopy. SW-B was detected at Rf 0.5 on the TLC plate developed with chloroform−methanol (90:10 v/v). The UV spectrum of SW-B in methanol showed peaks at 208 and 260 nm. The antibiotic SW-B was confirmed to be a derivative of a manumycin-type antibiotic, 2,4,6-trimethyldeca-(2E,4E)-dienamide (C13H23NO, 209.1780). SW-B showed strong antifungal activity against Phytophthora capsici, Magnaporthe grisea, Cladosporium cucumerinum, and Alternaria mali. However, it lacked antimicrobial activity against yeast and bacteria. Keywords: 2,4,6-Trimethyldeca-(2E,4E)-dienamide; manumycin; Streptomyces flaveus; antifungal activity
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