Chemical investigation of the Kappaphycus alvarezii-derived endophytic fungus Aspergillus micronesiensis lead to the isolation of three novel dibenzospiroketals, aspermicrones A-C (1-3). Their chemical structures were determined by extensive analysis of HR-ESI-MS and NMR spectral data. The absolute configurations of them were determined by experimental and TD-DFT theoretical calculated circular dichroism spectra. Compound 2 exhibited selective cytotoxic effect toward HepG2 cell line (IC50 = 9.9 µM). Additionally, both of compounds 2 and 3 displayed anti-microbial activity against Staphylococcus aureus (MIC = 123.2 µM for each compound). Compound 1 was inactivity in both cytotoxic and anti-microbial assays.
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This research was supported by the Ministry of Science and Technology of the Socialist Republic of Vietnam (Grant number: NĐT.11.GER/16) and by Vietnam Academy of Science and Technology (Grant number: VAST06.06/17-18).
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Luyen, N.D., Huong, L.M., Thi Hong Ha, T. et al. Aspermicrones A-C, novel dibenzospiroketals from the seaweed-derived endophytic fungus Aspergillus micronesiensis. J Antibiot 72, 843–847 (2019). https://doi.org/10.1038/s41429-019-0214-8