Whole-Genome Expression Profiling of Bradyrhizobium japonicum in Response to Hydrogen Peroxide
| Autor: | Jeong Min Jeon, Jae-Seong So, Woo Suk Chang, Andrew J. Donati, Hae In Lee, David W. Emerich |
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| Rok vydání: | 2011 |
| Předmět: |
Transcriptional Activation
Physiology Bradyrhizobium Transcriptome Nitrogen Fixation Gene expression Symbiosis Gene Oligonucleotide Array Sequence Analysis Regulation of gene expression Microbial Viability biology Gene Expression Profiling Genetic Complementation Test Polysaccharides Bacterial Gene Expression Regulation Bacterial Hydrogen Peroxide General Medicine Isocitrate lyase Oxidants biology.organism_classification Isocitrate Lyase Gene expression profiling Oxidative Stress Biochemistry Genes Bacterial Enzyme Induction Agronomy and Crop Science Genome Bacterial Transcription Factors Bradyrhizobium japonicum |
| Zdroj: | Molecular Plant-Microbe Interactions®. 24:1472-1481 |
| ISSN: | 1943-7706 0894-0282 |
| DOI: | 10.1094/mpmi-03-11-0072 |
| Popis: | Bradyrhizobium japonicum, a nitrogen-fixing bacterium in soil, establishes a symbiotic relationship with the leguminous soybean plant. Despite a mutualistic association between the two partners, the host plant produces an oxidative burst to protect itself from the invasion of rhizobial cells. We investigated the effects of H2O2-mediated oxidative stress on B. japonicum gene expression in both prolonged exposure (PE) and fulminant shock (FS) conditions. In total, 439 and 650 genes were differentially expressed for the PE and FS conditions, respectively, at a twofold cut-off with q < 0.05. A number of genes within the transport and binding proteins category were upregulated during PE and a majority of those genes are involved in ABC transporter systems. Many genes encoding σ factors, global stress response proteins, the FixK2 transcription factor, and its regulatory targets were found to be upregulated in the FS condition. Surprisingly, catalase and peroxidase genes which are typically expressed in other bacteria under oxidative stress were not differentially expressed in either condition. The isocitrate lyase gene (aceA) was induced by fulminant H2O2 shock, as was evident at both the transcriptional and translational levels. Interestingly, there was no significant effect of H2O2 on exopolysaccharide production at the given experimental conditions. |
| Databáze: | OpenAIRE |
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