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Springer Science and Business Media LLC Natural Products and Bioprospecting 13(1)
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    초록·키워드

    Microbes well-adapted to the Arctic Ocean are promising for producing novel compounds, due to their fancy strategies for adaptation and being under-investigated. Two new phenazine alkaloids (1 and 2) and one new phenoxazine (3) were isolated from Nocardiopsis dassonvillei 502F, a strain originally isolated from Arctic deep-sea sediments. AntiSMASH analysis of the genome of Nocardiopsis dassonvillei 502F revealed the presence of 16 putative biosynthetic gene clusters (BGCs), including a phenazine BGC. Most of the isolated compounds were evaluated for their antibacterial, antiallergic, and cytotoxic activities. Among them, compounds 4 and 5 exhibited potent in vitro cytotoxic activities against osteosarcoma cell line 143B with IC<sub>50</sub> values 0.16 and 20.0 μM, respectively. Besides, the results of antiallergic activities of compounds 6-8 exhibited inhibitory activities with IC<sub>50</sub> values of 10.88 ± 3.05, 38.88 ± 3.29, and 2.44 ± 0.17 μg/mL, respectively (IC<sub>50</sub> 91.6 μM for the positive control loratadine).

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