Abstract
Marine-derived microbial secondary metabolites are promising potential sources of nontoxic antifouling agents. The search for environmentally friendly and low-toxic antifouling components guided us to investigate the antifouling potentials of eight novel fungal isolates from deep-sea sediments of the South China Sea. Sixteen crude ethyl acetate extracts of the eight fungal isolates showed distinct antibacterial activity against three marine bacteria (Loktanella hongkongensis UST950701–009, Micrococcus luteus UST950701–006 and Pseudoalteromonas piscida UST010620–005), or significant antilarval activity against larval settlement of bryozoan Bugula neritina. Furthermore, the extract of Aspergillus westerdijkiae DFFSCS013 displayed strong antifouling activity in a field trial lasting 4 months. By further bioassay-guided isolation, five antifouling alkaloids including brevianamide F, circumdatin F and L, notoamide C, and 5-chlorosclerotiamide were isolated from the extract of A. westerdijkiae DFFSCS013. This is the first report about the antifouling potentials of metabolites of the deep-sea-derived fungi from the South China Sea, and the first stage towards the development of non- or low-toxic antifouling agents from deep-sea-derived fungi.
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Acknowledgments
We are grateful for the financial support provided by the National High Technology Research and Development Program of China (863 Program, 2012AA092104), the regional innovation demonstration project of Guangdong Province marine economic development (GD2012-D01-002), the National Basic Research Program of China (2010CB833803), the National Marine Public Welfare Research Project of China (201305017), the Natural Science Foundation of China (41206139), and the National Key Technologies R&D Program (2011BAE06B04–03).
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X.-Y. Zhang and X.-Y. Xu contributed equally to this work.
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Zhang, XY., Xu, XY., Peng, J. et al. Antifouling potentials of eight deep-sea-derived fungi from the South China Sea. J Ind Microbiol Biotechnol 41, 741–748 (2014). https://doi.org/10.1007/s10295-014-1412-9
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DOI: https://doi.org/10.1007/s10295-014-1412-9