PMID:19423625

Citation	Feng, JX, Song, ZZ, Duan, CJ, Zhao, S, Wu, YQ, Wang, C, Dow, JM and Tang, JL (2009) The xrvA gene of Xanthomonas oryzae pv. oryzae, encoding an H-NS-like protein, regulates virulence in rice. Microbiology (Reading, Engl.) 155:3033-44
Abstract	Xanthomonas oryzae pv. oryzae (Xoo) causes bacterial blight disease in rice, one of the most serious rice diseases. The xrvA gene from Xoo strain 1,3751 encodes a protein containing a histone-like nucleoid-structuring protein (H-NS) domain. The expression of xrvA in strain 1,3751 was enhanced in XOM2 minimal medium. Mutation of the xrvA gene of strain 1,3751 led to a significant reduction in virulence in the host plant rice, a delayed hypersensitive response in the nonhost castor-oil plant, a decrease in extracellular polysaccharide and diffusible signal factor production, and an increase in intracellular glycogen accumulation. Northern hybridization analyses revealed that the virulence-associated genes hrpG, hrpX, rpfC, rpfF, rpfG and gumB were downregulated in the xrvA mutant compared to the wild-type and complemented strains. Interestingly, increase of copy number of xrvA in the wild-type strain 1,3751 resulted in a strain showing similar phenotypes as the xrvA mutant and a reduction of the expression of gumB, hrpX, rpfC, rpfF and rpfG. These findings indicate that the xrvA gene, which is highly conserved in the sequenced strains of Xanthomonas, encodes an important regulatory factor for the virulence of Xoo.
Links	PubMed Online version:10.1099/mic.0.028910-0
Keywords	Bacterial Proteins/genetics; Bacterial Proteins/metabolism; Base Sequence; DNA-Binding Proteins/genetics; DNA-Binding Proteins/metabolism; Gene Expression Regulation, Bacterial; Genes, Bacterial; Glycogen/metabolism; Molecular Sequence Data; Oryza sativa/microbiology; Plant Diseases/microbiology; Polysaccharides, Bacterial/biosynthesis; Ricinus/microbiology; Transcription, Genetic; Virulence; Virulence Factors/biosynthesis; Virulence Factors/genetics; Xanthomonas/genetics; Xanthomonas/metabolism; Xanthomonas/pathogenicity
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
XANCP:Q9LCF2		GO:0009405: pathogenesis	ECO:0000315:		P		Figure 3 shows that XrvA contributes to the pathogenesis but is not completely dependent on it. Figure 5 also shows that XrvA has an influence on the expression levels of other known virulence genes.	complete CACAO 4928

References

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