The diguanylate cyclase GcpA inhibits the production of pectate lyases via the H-NS protein and RsmB regulatory RNA in Dickeya dadantii

文献类型： 外文期刊

第一作者： Liu, Fengquan

作者： Liu, Fengquan;Yuan, Xiaochen;Tian, Fang;Yang, Ching-Hong;Tian, Fang;He, Chenyang;Severin, Geoffrey B.;Waters, Christopher M.;Zeng, Quan

作者机构：

关键词： c-di-GMP; motility; pectate lyase; soft-rot pathogen; type III secretion system; virulence

期刊名称：MOLECULAR PLANT PATHOLOGY （ 影响因子：5.663； 五年影响因子：5.626 ）

ISSN： 1464-6722

年卷期： 2018 年 19 卷 8 期

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收录情况： SCI

摘要： Dickeya dadantii 3937 secretes pectate lyases (Pels) to degrade plant cell walls. Previously, we have demonstrated that EGcpB and EcpC function as bis-(3,5)-cyclic dimeric guanosine monophosphate (c-di-GMP)-specific phosphodiesterases (PDEs) to positively regulate Pel production. However, the diguanylate cyclase (DGC) responsible for the synthesis of c-di-GMP and the dichotomous regulation of Pel has remained a mystery. Here, we identified GcpA as the dominant DGC to negatively regulate Pel production by the specific repression of pelD gene expression. Quantitative reverse transcription-polymerase chain reaction (qRT-PCR) assays revealed that the expression levels of histone-like, nucleoid-structuring protein encoding gene hns and post-transcriptional regulator encoding genes rsmA and rsmB were significantly affected by GcpA. Deletion of hns or rsmB in the gcpA(D418A) site-directed mutant restored its Pel production and pelD expression, demonstrating that H-NS and RsmB contribute to the GcpA-dependent regulation of Pel in D.dadantii. In addition, RsmB expression was subject to positive regulation byH-NS. Thus, we propose a novel pathway consisting of GcpA-H-NS-RsmB-RsmA-pelD that controls Pel production in D.dadantii. Furthermore, we showed that H-NS and RsmB are responsible for the GcpA-dependent regulation of motility and type III secretion system (T3SS) gene expression, respectively. Of the two PDEs involved in the regulation of Pels, only EGcpB regulates pelD expression through the same pathway as GcpA.

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