FEMS Microbiology Letters (2014) 357, 81-90

Jun Tao, Chunxia Li, Chao Luo and Chaozu He (2014)
RavA/RavR two-component system regulates Xanthomonas campestris pathogenesis and c-di-GMP turnover
FEMS Microbiology Letters 357 (1), 81-90
Abstract: The two-component system (TCS), consisting of a response regulator (RR) and a cognate histidine kinase (HK), responds to extra-/intercellular cues and triggers adaptive changes. The RR, RavR, has been reported to act as a positive virulence regulator and a c-di-GMP hydrolase in Xanthomonas campestris pv. campestris (Xcc). Here, we identified the cognate HK, RavA, that regulate RavR phosphorylation levels and bacterial pathogenesis. Deletion of ravA, a putative HK gene flanking ravR, dramatically attenuated Xcc virulence. Phenotypes of the double mutant Delta-ravR/Delta-ravA were similar to those of Delta-ravR, suggesting that RavR is a downstream component of RavA signaling. RavA interacts with RavR and positively influences the phosphorylated RavR levels. In vitro analysis suggests that RavR is a bifunctional enzyme involved in c-di-GMP synthesis and degradation. Importantly, mutation and enzyme activity assays indicate that the phosphorylation level affects RavR c-di-GMP turnover activity. These results show that RavA acts as the RavR cognate HK, which fine-tunes RavR functions and enables bacteria to adapt quickly to intracellular changes.
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Link to article at publishers website
Database assignments for author(s): Chaozu He

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Xanthomonas campestris pv. campestris