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| Content Provider | PubMed Central |
|---|---|
| Author | An, Shi-qi Caly, Delphine L. Mccarthy, Yvonne Murdoch, Sarah L. Ward, Joseph Febrer, Melanie Dow, J. Maxwell Ryan, Robert P. |
| Editor | Mackey, David |
| Copyright Year | 2014 |
| Abstract | Bis-(3′,5′) cyclic di-guanylate (cyclic di-GMP) is a key bacterial second messenger that is implicated in the regulation of many critical processes that include motility, biofilm formation and virulence. Cyclic di-GMP influences diverse functions through interaction with a range of effectors. Our knowledge of these effectors and their different regulatory actions is far from complete, however. Here we have used an affinity pull-down assay using cyclic di-GMP-coupled magnetic beads to identify cyclic di-GMP binding proteins in the plant pathogen Xanthomonas campestris pv. campestris (Xcc). This analysis identified XC_3703, a protein of the YajQ family, as a potential cyclic di-GMP receptor. Isothermal titration calorimetry showed that the purified XC_3703 protein bound cyclic di-GMP with a high affinity (Kd∼2 µM). Mutation of XC_3703 led to reduced virulence of Xcc to plants and alteration in biofilm formation. Yeast two-hybrid and far-western analyses showed that XC_3703 was able to interact with XC_2801, a transcription factor of the LysR family. Mutation of XC_2801 and XC_3703 had partially overlapping effects on the transcriptome of Xcc, and both affected virulence. Electromobility shift assays showed that XC_3703 positively affected the binding of XC_2801 to the promoters of target virulence genes, an effect that was reversed by cyclic di-GMP. Genetic and functional analysis of YajQ family members from the human pathogens Pseudomonas aeruginosa and Stenotrophomonas maltophilia showed that they also specifically bound cyclic di-GMP and contributed to virulence in model systems. The findings thus identify a new class of cyclic di-GMP effector that regulates bacterial virulence. |
| Related Links | http://dx.doi.org/10.1371/journal.ppat.1004429 |
| Starting Page | 1004429 |
| File Format | |
| ISSN | 15537374 |
| e-ISSN | 15537374 |
| Journal | PLoS Pathogens |
| Issue Number | 10 |
| Volume Number | 10 |
| Language | English |
| Publisher | Public Library of Science |
| Publisher Date | 2014-10-01 |
| Access Restriction | Open |
| Rights Holder | Public Library of Science |
| Subject Keyword | Immunology Genetics Molecular Biology Microbiology Parasitology Virology Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Genetics Virology Molecular Biology Parasitology Immunology Microbiology |
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