Positive regulation of the PhcB neighbouring regulator PrhX on expression of the type III secretion system and pathogenesis in Ralstonia solanacearum

文献类型： 外文期刊

第一作者： Huang, Jiajun

作者： Huang, Jiajun;Guo, Tao;Zhang, Yong;Wang, Rongsheng;Zhang, Qi;Hikichi, Yasufumi;Ohnishi, Kouhei;Wang, Chunli;Liang, Tao;Jiang, Gaofei;Zhang, Yong

作者机构：

关键词： pathogenesis; PhcA; quorum sensing; Ralstonia solanacearum; type III secretion system

期刊名称：MOLECULAR PLANT PATHOLOGY （ 影响因子：4.8； 五年影响因子：6.0 ）

ISSN： 1464-6722

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Ralstonia solanacearum PhcB and PhcA control a quorum-sensing (QS) system that globally regulates expression of about one third of all genes, including pathogenesis genes. The PhcB-PhcA QS system positively regulates the production of exopolysaccharide (EPS) and negatively regulates hrp gene expression, which is crucial for the type III secretion system (T3SS). Both EPS and the T3SS are essential for pathogenicity. The gene rsc2734 is located upstream of a phcBSR operon and annotated as a response regulator of a two-component system. Here, we demonstrated that RSc2734, hereafter named PrhX, positively regulated hrp gene expression via a PrhA-PrhIR-PrhJ-HrpG signalling cascade. Moreover, PrhX was crucial for R. solanacearum to invade host roots and grow in planta naturally. prhX expression was independent of the PhcB-PhcA QS system. PrhX did not affect the expression of phcB and phcA and the QS-dependent phenotypes, such as EPS production and biofilm formation. Our results provide novel insights into the complex regulatory network of the T3SS and pathogenesis in R. solanacearum.

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