PMID: 9422588Jan 9, 1998Paper

EpsR modulates production of extracellular polysaccharides in the bacterial wilt pathogen Ralstonia (Pseudomonas) solanacearum

Journal of Bacteriology
M Chapman, C C Kao

Abstract

Ralstonia solanacearum is the causal agent of bacterial wilt of many agriculturally important crops. Exopolysaccharide synthesized by products of the epsI operon is the major virulence factor for R. solanacearum. Expression of epsI has been demonstrated to be under the control of several proteins, including several two-component regulators. Overexpression of EpsR was found previously to reduce the amount of synthesis specifically from the epsI promoter. Here we present data that a single chromosomal copy of epsR activates the epsI promoter, suggesting that EpsR is a concentration-dependent effector of epsI gene expression. Furthermore, the ability of EpsR to modulate epsI expression is dependent on the phosphorylation state of EpsR. Gel mobility shift assays suggest that EpsR can specifically bind the epsI promoter and that this binding requires a phosphorylated form of EpsR.

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Citations

Aug 2, 2013·International Journal of Molecular Sciences·Pablo C BoginoWalter Giordano
Nov 24, 2016·Environmental Microbiology·Simon LeonardSylvie Reverchon
Jul 19, 2002·Molecular Microbiology·Adam J Haugo, Paula I Watnick
Apr 30, 2017·Frontiers in Plant Science·Ivan ErillMarc Valls

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