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The thioredoxin family plays crucial roles in bacterial oxidative stress defenses and virulence regulation, while the function of its member YbbN in Vibrio parahaemolyticus remains unclear. [Objective] To elucidate the regulatory role of YbbN in the biological characteristics and pathogenicity of Vibrio parahaemolyticus, providing potential targets for developing novel anti-infection strategies. [Methods] The ybbN knockout strain (ΔybbN) and complementary strain (CΔybbN) of Vibrio parahaemolyticus SH112 were constructed by homologous recombination. The strains were compared regarding the growth characteristics, motility, biofilm formation, bacterial competition, cell adhesion, cytotoxicity, and pathogenicity in mice. [Results] Although the knockout of ybbN showed no significant effects on bacterial growth, motility, cell adhesion, or colonization, it markedly attenuated key pathogenic traits. Specifically, it decreased the biofilm formation (by 19%-30%), killing efficiency against competitive bacteria (*: P<0.05; ****: P<0.000 1), and cytotoxicity in HeLa cells (by 27%), while increasing the survival rate of mice by 87.5%. [Conclusion] This study demonstrates for the first time that YbbN specifically regulates critical aspects involved in biofilm formation, bacterial competition, and cytotoxicity in host cells, significantly influencing the biological characteristics and pathogenicity of Vibrio parahaemolyticus. These findings not only expand the understanding about the functional diversity of the thioredoxin family proteins but also provide new molecular targets and a theoretical basis for preventing Vibrio parahaemolyticus infections.
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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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