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Assessing the Putative Anticryptococcal Properties of Crude and Clarified Extracts from Mollusks
Published on: December 2, 2022
Alkaloids from a deep ocean sediment-derived fungus Penicillium sp. and their antitumor activities
1Key Laboratory of Marine Drugs, Chinese Ministry of Education School of Medicine and Pharmacy, Institute of Marine Drugs and Food, Ocean University of China, Qingdao, PR China.
Abstract:
Four new alkaloids, including two new meleagrin analogs, meleagrin D (1) and E (2), and two new diketopiperazines, roquefortine H (3) and I (4), were isolated from a deep ocean sediment-derived fungus Penicillium sp. Meleagrin D (1) and E (2) possess unprecedented acetate-mevalonate-derived side chains on the imidazole moiety. These new meleagrins showed weak cytotoxicity against the A-549 cell line, whereas meleagrin B (5) and meleagrin (6), which were isolated previously from the same strain, induced HL-60 cell apoptosis or arrested the cell cycle through G(2)/M phase, respectively. The results indicate that the distinct substitutions on the imidazole ring significantly influence the cytotoxicity of the meleagrin alkaloids.
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