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A new cyclic depsipeptide ( 1 ) has been isolated from culture broth of Staphylococcus sp. (No. P-100826-4-6) derived from Corallina officinalis L., together with the known compounds indol-3-carboxylic acid ( 2 ), 1,5-dideoxy-3-C-methyl arabinitol ( 3 ), thymine ( 4 ), uracil ( 5 ), cyclo (L-pro-L-omet) ( 6 ) and macrolactin B ( 7 ). The structure of ( 1 ) was established to be cyclo (2α, 3-diaminopropoinc acid-L-Asn-3-β-hydroxy-5-methyl-tetradecanoic acid-L-Leu 1 -L-Asp-L-Val-L-Leu 2 -L-Leu 3 ) by extensive spectroscopic techniques including 1 H NMR, 13 C NMR, 1 H‒ 1 H COSY, HMBC, HSQC, NOESY, and HRFABMS. The antimicrobial activities of compounds 1-7 were evaluated. Compounds 1-5 , and 7 showed moderate antimicrobial activity while compound 6 exhibited a potent antimicrobial and antifungal activities.

Production of a New Cyclic Depsipeptide by the Culture Broth of Staphylococcus sp. Isolated from Corallina officinalis L.