期刊
NATURAL PRODUCT RESEARCH
卷 28, 期 7, 页码 503-506出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786419.2013.879305
关键词
cytotoxic; chlorinated depsidones; DNA damaging; marine fungus; larvicidal; antimicrobial; Aspergillus unguis
资金
- Natural Science Foundation of China [20902009]
- China Postdoctoral Science Foundation [2011M500051, 2012T50242]
- Foundation of the Key Laboratory of Experimental Marine Biology (Chinese Academy of Sciences) [kf201009]
- Scientific and Technological Fund of Dalian [2008J23JH041]
Four chlorinated depsidones (two reported for the second time (1 and 2) and two known (3 and 4)) were isolated from a seaweed-derived Aspergillus unguis strain. Their structures were spectroscopically elucidated. Compounds 1, 3 and 4 strongly inhibited methicillin-resistant Staphylococcus aureus (MRSA) with minimum inhibitory concentrations (MICs) of 2, 2 and 4 mu g/mL and killed Artemia larva with LC50 of 4.1, 1.7 and 2.8 mu g/mL, respectively. Besides, in DNA-damaging test, they also selectively inhibited a DNA repair capacity-defective Escherichia coli strain AB3027(-) (MICs: 2, 32 and 4 mu g/mL, respectively) compared with the wild-type strain AB1157(+) (MICs: over 512, over 512 and 256 mu g/mL, respectively). Furthermore, compound 1 also strongly inhibited cancer cell line A-549 (IC50: 0.5 mu g/mL). The above-mentioned bioactivities were newly reported for compound 1. In contrast, compound 2 did not exhibit significant activity. The structure-activity relationship indicated that a complete lactone ring may be important.
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