Journal
MARINE DRUGS
Volume 13, Issue 8, Pages 5219-5236Publisher
MDPI
DOI: 10.3390/md13085219
Keywords
chromone derivatives; remisporine; epiremisporine; isoconiochaetone; ECD; marine-derived fungus; Penicillium purpurogenum G59; DES mutagenesis
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Funding
- NSFC [30973631]
- NHTRDP [2013AA092901, 2007AA09Z411]
- NSTMP [2009ZX09301-002, 2012ZX09301-003]
- AMMS, China
- NSFC-Shandong Joint Fund for Marine Science Research Centers, China [U1406402]
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Three new and rare chromones, named epiremisporine B (2), epiremisporine B1 (3) and isoconiochaetone C (4), along with three known remisporine B (1), coniochaetone A (5) and methyl 8-hydroxy-6-methyl-9-oxo-9H-xanthene-1-carboxylate (6) were isolated from a mutant from the diethyl sulfate (DES) mutagenesis of a marine-derived Penicillium purpurogenum G59. The structures of 2-4 including the absolute configurations were determined by spectroscopic methods, especially by NMR analysis and electronic circular dichroism (ECD) experiments in conjunction with calculations. The absolute configuration of the known remisporine B (1) was determined for the first time. Compounds 2 and 3 have a rare feature that has only been reported in one example so far. The compounds 1-6 were evaluated for their cytotoxicity against several human cancer cell lines. The present work explored the great potential of our previous DES mutagenesis strategy for activating silent fungal pathways, which has accelerated the discovery of new bioactive compounds.
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