文献类型： 外文期刊

第一作者： Ziye, Shang

作者： Ziye, Shang;Shitong, Wu;Ling, Cai;Chenchao, Sun;Yanli, Tian;Baishi, Hu;Ziye, Shang;Shitong, Wu;Ling, Cai;Chenchao, Sun;Yanli, Tian;Baishi, Hu;Ziye, Shang;Shitong, Wu;Ling, Cai;Chenchao, Sun;Yanli, Tian;Baishi, Hu;Yuqiang, Zhao;Jun, Wang;Weirong, Gong;Yanli, Tian;Baishi, Hu

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关键词： Paracidovorax citrulli; ClpA; RepA; virulence; regulate

期刊名称：FRONTIERS IN MICROBIOLOGY （ 影响因子：4.0； 五年影响因子：5.1 ）

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年卷期： 2024 年 15 卷

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收录情况： SCI

摘要： ClpA is a widely conserved protease in bacteria that plays a key role in virulence. To investigate its specific mechanism of action in the pathogenicity of Paracidovorax citrulli (formerly Acidovorax citrulli), we constructed a ClpA deletion mutant, Delta ClpA. The Delta ClpA mutant of P. citrulli displayed reduced virulence on melon seedlings, and reduced motility, swarming ability, and antioxidant capacity. On the other hand, the ClpA deletion of P. citrulli mutant reduced the resistance to elevated temperature and enhanced biofilm formation ability. Using qRT-PCR, we observed that ClpA negatively regulates the expression of the virulence-related genes virB, pilR, pilA, and fliM, while positively regulating hrpG, hrcQ, and trbC. Bacterial double hybrid and Glutathione-S-transferase pulldown (GST-pulldown) results showed that ClpA interacts directly with RepA, and negatively regulates the expression of RepA. After deletion of the RepA gene, the pathogenicity of P. citrulli was lost, biofilm formation ability was enhanced, and the expression of hrpG, pilR, and trbC was positively regulated. These results indicate that ClpA plays a key role in the regulation of several virulence traits of P. citrulli, paving the way for future studies to better elucidate the virulence mechanisms of this bacterial plant pathogen.

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