Potassium and sodium transporters of Pseudomonas aeruginosa regulate virulence to barley.
Appl Microbiol Biotechnol, 2008/7;79(5):843-58.
Affiliations
PMID: 18481058DOI: 10.1007/s00253-008-1483-5
Impact factor: 5.56
Abstract
We investigated the role of three uncharacterized cation transporters of Pseudomonas aeruginosa PAO1 as virulence factors for barley: PA1207, PA5021, and PA2647. PAO1 displayed reduced barley virulence with inactivated PA1207, PA5021, and PA2647 as well as with one known Na(+)/H(+) antiporter, PA1820. Using the Escherichia coli LB2003 mutant lacking three K(+) uptake systems, the expression of the PA5021 gene repressed LB2003 growth with low K(+), but the strain acquired tolerance to high K(+). In contrast, the expression of the PA1207 gene enhanced growth of LB2003 with low K(+) but repressed its growth with high K(+); therefore, the PA5021 protein exports K(+), while the PA1207 protein imports K(+). The PA5021 mutant of P. aeruginosa also showed impaired growth at 400 mM KCl and at 400 mM NaCl; therefore, the PA5021 protein may also export Na(+). The loss of the PA5021 protein also decreased production of the virulence factor pyocyanin; corroborating this result, pyocyanin production decreased in wild-type PAO1 under high salinity. Whole-genome transcriptome analysis showed that PAO1 induced more genes in barley upon infection compared to the PA5021 mutant. Additionally, PAO1 infection induced water stress-related genes in barley, which suggests that barley may undergo water deficit upon infection by this pathogen.
MeSH terms
Bacterial Proteins; Biofilms; Cation Transport Proteins; Gene Expression Regulation, Plant; Hordeum; Molecular Sequence Data; Plant Diseases; Plant Proteins; Potassium; Pseudomonas aeruginosa; Pyocyanine; Sodium; Virulence; Virulence Factors
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