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As a subterranean, soil-dwelling insect, Odontotermes formosanus is susceptible to infection by diverse soil-borne pathogenic fungi. Its symbiotic actinobacteria produce bioactive compounds to combat these pathogens, thereby maintaining a stable symbiotic system of O. formosanus with Termitomyces spp. [Objective] To screen and characterize antifungal metabolites from symbiotic actinobacteria of O. formosanus and to elucidate their defensive role in the termite-fungus symbiotic system. [Methods] Actinobacteria were isolated from O. formosanus-associated samples via diverse culture media. Antifungal strains were screened via dual-culture confrontation assays. The active strain OFGS46 was selected for whole-genome sequencing. Biosynthetic gene clusters (BGCs) were predicted by antiSMASH, and secondary metabolites were analyzed by HPLC-MS. [Results] Twenty-three actinobacteria strains were isolated. Strain OFGS46 exhibited inhibition rates of (62.05±0.98)% against Xylaria sp. and (79.99±0.58)% against Talaromyces sp. Whole-genome sequencing on the Illumina NovaSeq platform yielded approximately 1 Gb of high-quality data. De novo assembly generated a draft genome of 8 470 479 bp. CheckM evaluation demonstrated high assembly quality with 99.91% completeness and 4.63% contamination. HPLC-MS results revealed that strain OFGS46 was capable of producing multiple bioactive secondary metabolites, including enduracidin A, WS9326A, kitacinnamycin A, WAP-8294A2, skyllamycin A, cahuitamycin A, pentamycin, scabichelin, coprisamide C, and frankobactin A1. [Conclusion] This study systematically reveals that the symbiotic actinobacterium OFGS46 from O. formosanus suppresses nest pathogens through the production of diverse antimicrobial compounds. These findings not only elucidate, from a perspective of chemical ecology, the role of symbiotic bacteria in host immune defenses through suppressing multiple pathogenic fungi, but also provide a scientific basis for developing novel antimicrobial resources derived from the termite symbiotic system.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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