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Appl Environ Microbiol. 2007 Nov;73(21):6748-56. Epub 2007 Sep 7.

Characterization of regulatory pathways in Xylella fastidiosa: genes and phenotypes controlled by algU.

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  • 1Department of Plant Pathology and Microbiology, University of California, 900 University Avenue, Riverside, CA 92521, USA.

Abstract

Many virulence genes in plant bacterial pathogens are coordinately regulated by "global" regulatory genes. Conducting DNA microarray analysis of bacterial mutants of such genes, compared with the wild type, can help to refine the list of genes that may contribute to virulence in bacterial pathogens. The regulatory gene algU, with roles in stress response and regulation of the biosynthesis of the exopolysaccharide alginate in Pseudomonas aeruginosa and many other bacteria, has been extensively studied. The role of algU in Xylella fastidiosa, the cause of Pierce's disease of grapevines, was analyzed by mutation and whole-genome microarray analysis to define its involvement in aggregation, biofilm formation, and virulence. In this study, an algU::nptII mutant had reduced cell-cell aggregation, attachment, and biofilm formation and lower virulence in grapevines. Microarray analysis showed that 42 genes had significantly lower expression in the algU::nptII mutant than in the wild type. Among these are several genes that could contribute to cell aggregation and biofilm formation, as well as other physiological processes such as virulence, competition, and survival.

PMID:
17827317
PMCID:
PMC2074953
DOI:
10.1128/AEM.01232-07
[PubMed - indexed for MEDLINE]
Free PMC Article
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