数字农科院2.0

Evidence for a Functional HipBA Toxin–Antitoxin System in Acidovorax citrulli

文献类型： 外文期刊

作者： Hao Zhang;Mei Zhao;Lulu Cai;Wei Guan;Yuwen Yang;Ron Walcott;Wenjun Zhao;Tingchang Zhao

作者机构：

关键词： Acidovorax citrulli;HipBA;stress response;toxin–antitoxin systems

期刊名称： International Journal of Molecular Sciences

ISSN： 1661-6596

年卷期： 2025 年 26 卷 7 期

页码：

收录情况： SCIE（2025版）

摘要： Bacterial fruit blotch (BFB) is a highly destructive seed-borne and seed-transmitted disease caused by the Gram-negative bacterium Acidovorax citrulli that has caused substantial economic losses for the cucurbit industry in China. Despite its potential for economic damage, little is known about the bacterium’s molecular mechanisms of pathogenicity. Toxin–antitoxin (TA) systems are critical for the bacterial stress response. These systems are composed of two genes, toxin and antitoxin, that encode a stable toxin protein and a labile antitoxin protein, respectively. In this study, the genes for the putative HipBA TA system were identified in A. citrulli genomes through bioinformatic analysis. A series of molecular biology experiments have demonstrated that the HipBA TA system exists in A. citrulli Aac5. Furthermore, the transcription of hipA and hipB in A. citrulli Aac5 were induced by pH stress, chloramphenicol stress, and during plant infection. Overall, our results have revealed an active type II TA system, HipBA, in A. citrulli Aac5, and provided insights into its biological functions. These findings contribute to a better understanding of TA systems in plant pathogens.

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