Bacteria Vibrio sp. isolated from the sponge Dysidea sp. were shown to biosynthesize brominated diphenyl ethers. We identified one of the bacterial brominated metabolites, using gas liquid chromatography and mass spectrometry to compare this product with standard 3,5-dibromo-2-(3',5'-dibromo-2'-methoxyphenoxy)phenol. The latter has been isolated from ethanol extracts of the sponge Dysidea sp.
A new sesquiterpene of the caryophyllene series, fuscoatrol А (1), and known compounds, 11 epiterpestacin (2) and β nitropropionic acid (3), were isolated from the marine fungus Humicola fuscoatra (Traaen) KMM 4629 associated with the Kuril colonial ascidium. The structure of 1 was established on the basis of X ray diffraction data and 2D NMR spectroscopy. The antimicrobial and cytotoxic activities of compounds 1-3 were studied.
Three new diterpene glycosides, virescenosides O (1), P (2), and Q (3), have been isolated from a marine strain of Acremonium striatisporum KMM 4401 associated with the holothurian Eupentacta fraudatrix. Their structures were determined on the basis of HRMALDIMS and NMR data as beta-D-altropyranosido-19-isopimara-8(14),15-diene-7alpha,3beta-diol (1), beta-D-altropyranosido-19-7-oxoisopimara-8(9),15-diene-3beta-ol (2), and beta-D-mannopyranosido-19-isopimara-7,15-diene-3beta-ol (3). The cytotoxic activity of the virescenosides was examined.
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