Chemical constituents of marine mangrove-derived endophytic fungus Alternaria tenuissima EN-192 |
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Authors: | SUN Hong GAO Shushan LI Xiaoming LI Chunshun WANG Bingui |
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Institution: | 1. Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071,China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China 2. Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071,China |
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Abstract: | A chemical investigation of the ethyl acetate extract of the fermentation broth of Alternaria tenuissima EN-192, an endophytic fungus obtained from the stems of the marine mangrove plant Rhizophora stylosa, resulted in the isolation of nine known secondary metabolites, including four indole-diterpenoids: penijanthine A (1), paspaline (2), paspalinine (3), and penitrem A (4); three tricycloalternarene derivatives: tricycloalternarene 3a (5), tricycloalternarene 1b (6), and tricycloalternarene 2b (7); and two alternariol congeners: djalonensone (8) and alternariol (9). The chemical structures of these metabolites were characterized through a combination of detailed spectroscopic analyses and their comparison with reports from the literature. The inhibitory activities of each isolated compound against four bacteria were evaluated and compounds 5 and 8 displayed moderate activity against the aquaculture pathogenic bacterium Vibrio anguillarum, with inhibition zone diameters of 8 and 9 mm, respectively, at 100 μg/disk. To the best of our knowledge, this is the first report on the secondary metabolites of mangrove-derived A lternaria tenuissima and also the first report of the isolation of indole-diterpenoids from fungal genus A lternaria. |
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Keywords: | endophytic fungus Alternaria tenuissima Rhizophora stylosa indole-diterpene |
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