期刊
RNA BIOLOGY
卷 18, 期 11, 页码 1818-1833出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/15476286.2020.1871217
关键词
Gac-rsm; CsrA; RsmA; global regulation; Pseudomonas syringae; regulatory RNAs
资金
- ERDF/Spanish Ministry of Science, Innovation and Universities - State Research Agency [BIO2014-55075-P, BIO2017-83533-P]
- Ministerio de Educacion, Cultura y Deporte [ECD/1619/2013]
- Deutscher Akademischer Austauschdienst (DE) [RISE-Worldwide scholarship]
The study focused on the expression and regulation of rsm regulatory sRNAs in Pseudomonas syringae pv. tomato (Pto) DC3000, revealing insights into the functioning of the complex Gac-rsm pathway and the interplay among its components.
The Gac-rsm pathway is a global regulatory network that governs mayor lifestyle and metabolic changes in gamma-proteobacteria. In a previous study, we uncovered the role of CsrA proteins promoting growth and repressing motility, alginate production and virulence in the model phytopathogen Pseudomonas syringae pv. tomato (Pto) DC3000. Here, we focus on the expression and regulation of the rsm regulatory sRNAs, since Pto DC3000 exceptionally has seven variants (rsmX1-5, rsmY and rsmZ). The presented results offer further insights into the functioning of the complex Gac-rsm pathway and the interplay among its components. Overall, rsm expressions reach maximum levels at high cell densities, are unaffected by surface detection, and require GacA for full expression. The rsm levels of expression and GacA-dependence are determined by the sequences found in their -35/-10 promoter regions and GacA binding boxes, respectively. rsmX5 stands out for being the only rsm in Pto DC3000 whose high expression does not require GacA, constituting the main component of the total rsm pool in a gacA mutant. The deletion of rsmY and rsmZ had minor effects on Pto DC3000 motility and virulence phenotypes, indicating that rsmX1-5 can functionally replace them. On the other hand, rsmY or rsmZ overexpression in a gacA mutant did not revert its phenotype. Additionally, a negative feedback regulatory loop in which the CsrA3 protein promotes its own titration by increasing the levels of several rsm RNAs in a GacA-dependent manner has been disclosed as part of this work.
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