Journal
MARINE DRUGS
Volume 9, Issue 8, Pages 1391-1402Publisher
MDPI
DOI: 10.3390/md9081391
Keywords
marine bacteria; bioactive; antimicrobial; symbiosis; tropodithietic acid
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Funding
- Australian Research Council
- Centre for Marine Bio-Innovation
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Surface-associated marine bacteria often produce secondary metabolites with antagonistic activities. In this study, tropodithietic acid (TDA) was identified to be responsible for the antibacterial activity of the marine epiphytic bacterium Pseudovibrio sp. D323 and related strains. Phenol was also produced by these bacteria but was not directly related to the antibacterial activity. TDA was shown to effectively inhibit a range of marine bacteria from various phylogenetic groups. However TDA-producers themselves were resistant and are likely to possess resistance mechanism preventing autoinhibition. We propose that TDA in isolate D323 and related eukaryote-associated bacteria plays a role in defending the host organism against unwanted microbial colonisation and, possibly, bacterial pathogens.
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