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Spiculisporic acid analogues of the marine-derived fungus, Aspergillus candidus strain HDf2, and their antibacterial activity

Wang, Rong, Guo, Zhi Kai, Li, Xiang Min, Chen, Fu Xiao, Zhan, Xia Fei, Shen, Ming Hui
Antonie van Leeuwenhoek 2015 v.108 no.1 pp. 215-219
Aspergillus candidus, Ralstonia solanacearum, Staphylococcus aureus, adenocarcinoma, antibacterial properties, antibiotics, culture media, cytotoxicity, fractionation, fungi, humans, neoplasm cells, nuclear magnetic resonance spectroscopy, pathogens, soil
Two novel antibiotic spiculisporic acid analogues, named as spiculisporic acid F (1) and G (2), and two known compounds, (−)-spiculisporic acid (3) and secospiculisporic acid B (4), were isolated by bioactivity-guided fractionation from the fermentation broth of the sea urchin-derived Aspergillus candidus strain HDf2. Their structures were unambiguously established by comprehensive analysis of 1D and 2D NMR, and high-resolution MS spectra, and by comparison with known compounds. Biological experiments demonstrated that compounds 1 and 2 displayed antibacterial activity against Gram-negative Pseudomonas solanacearum and Gram-positive Staphylococcus aureus, but showed no cytotoxicity against SGC-7901 human gastric adenocarcinoma and SPC-A-1 human lung adenocarcinoma tumor cell lines. This is the first critical evidence identifying spiculisporic acid derivatives as a potential bio-control agent for the soil borne pathogen P. solanacearum (E. F. Smith) Smith. These findings provide further insight into the chemical and biological activity diversity of this class of compounds.