author_facet Chao, Tzu-Chiao
Buhrmester, Jens
Hansmeier, Nicole
Pühler, Alfred
Weidner, Stefan
Chao, Tzu-Chiao
Buhrmester, Jens
Hansmeier, Nicole
Pühler, Alfred
Weidner, Stefan
author Chao, Tzu-Chiao
Buhrmester, Jens
Hansmeier, Nicole
Pühler, Alfred
Weidner, Stefan
spellingShingle Chao, Tzu-Chiao
Buhrmester, Jens
Hansmeier, Nicole
Pühler, Alfred
Weidner, Stefan
Applied and Environmental Microbiology
Role of the Regulatory GenerirAin the Transcriptional Response ofSinorhizobium melilotito Iron Limitation
Ecology
Applied Microbiology and Biotechnology
Food Science
Biotechnology
author_sort chao, tzu-chiao
spelling Chao, Tzu-Chiao Buhrmester, Jens Hansmeier, Nicole Pühler, Alfred Weidner, Stefan 0099-2240 1098-5336 American Society for Microbiology Ecology Applied Microbiology and Biotechnology Food Science Biotechnology http://dx.doi.org/10.1128/aem.71.10.5969-5982.2005 <jats:title>ABSTRACT</jats:title><jats:p>A regulatory network of<jats:italic>Sinorhizobium meliloti</jats:italic>genes involved in adaptation to iron-limiting conditions and the involvement of the rhizobial iron regulator gene (<jats:italic>rirA</jats:italic>) were analyzed by mutation and microarray analyses. A constructed<jats:italic>S. meliloti rirA</jats:italic>mutant exhibited growth defects and enhanced H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub>sensitivity in the presence of iron, but symbiotic nitrogen fixation was not affected. To identify iron-responsive and RirA-regulated<jats:italic>S. meliloti</jats:italic>genes, a transcriptome approach using whole-genome microarrays was used. Altogether, 45 genes were found to be jointly derepressed by mutation of<jats:italic>rirA</jats:italic>and under different iron-limited conditions. As expected, a number of genes involved in iron transport (e.g.,<jats:italic>hmuPSTU</jats:italic>,<jats:italic>shmR</jats:italic>,<jats:italic>rhbABCDEF</jats:italic>,<jats:italic>rhtX</jats:italic>, and<jats:italic>rhtA</jats:italic>) and also genes with predicted functions in energy metabolism (e.g.,<jats:italic>fixN3</jats:italic>,<jats:italic>fixP3</jats:italic>, and<jats:italic>qxtAB</jats:italic>) and exopolysaccharide production (e.g.,<jats:italic>exoY</jats:italic>and<jats:italic>exoN</jats:italic>) were found in this group of genes. In addition, the iron deficiency response of<jats:italic>S. meliloti</jats:italic>also involved<jats:italic>rirA</jats:italic>-independent expression changes, including repression of the<jats:italic>S. meliloti</jats:italic>flagellar regulon. Finally, the RirA modulon also includes genes that are not iron responsive, including a gene cluster putatively involved in Fe-S cluster formation (<jats:italic>sufA</jats:italic>,<jats:italic>sufS</jats:italic>,<jats:italic>sufD</jats:italic>,<jats:italic>sufC</jats:italic>, and<jats:italic>sufB</jats:italic>).</jats:p> Role of the Regulatory Gene<i>rirA</i>in the Transcriptional Response of<i>Sinorhizobium meliloti</i>to Iron Limitation Applied and Environmental Microbiology
doi_str_mv 10.1128/aem.71.10.5969-5982.2005
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series Applied and Environmental Microbiology
source_id 49
title Role of the Regulatory GenerirAin the Transcriptional Response ofSinorhizobium melilotito Iron Limitation
title_unstemmed Role of the Regulatory GenerirAin the Transcriptional Response ofSinorhizobium melilotito Iron Limitation
title_full Role of the Regulatory GenerirAin the Transcriptional Response ofSinorhizobium melilotito Iron Limitation
title_fullStr Role of the Regulatory GenerirAin the Transcriptional Response ofSinorhizobium melilotito Iron Limitation
title_full_unstemmed Role of the Regulatory GenerirAin the Transcriptional Response ofSinorhizobium melilotito Iron Limitation
title_short Role of the Regulatory GenerirAin the Transcriptional Response ofSinorhizobium melilotito Iron Limitation
title_sort role of the regulatory gene<i>rira</i>in the transcriptional response of<i>sinorhizobium meliloti</i>to iron limitation
topic Ecology
Applied Microbiology and Biotechnology
Food Science
Biotechnology
url http://dx.doi.org/10.1128/aem.71.10.5969-5982.2005
publishDate 2005
physical 5969-5982
description <jats:title>ABSTRACT</jats:title><jats:p>A regulatory network of<jats:italic>Sinorhizobium meliloti</jats:italic>genes involved in adaptation to iron-limiting conditions and the involvement of the rhizobial iron regulator gene (<jats:italic>rirA</jats:italic>) were analyzed by mutation and microarray analyses. A constructed<jats:italic>S. meliloti rirA</jats:italic>mutant exhibited growth defects and enhanced H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub>sensitivity in the presence of iron, but symbiotic nitrogen fixation was not affected. To identify iron-responsive and RirA-regulated<jats:italic>S. meliloti</jats:italic>genes, a transcriptome approach using whole-genome microarrays was used. Altogether, 45 genes were found to be jointly derepressed by mutation of<jats:italic>rirA</jats:italic>and under different iron-limited conditions. As expected, a number of genes involved in iron transport (e.g.,<jats:italic>hmuPSTU</jats:italic>,<jats:italic>shmR</jats:italic>,<jats:italic>rhbABCDEF</jats:italic>,<jats:italic>rhtX</jats:italic>, and<jats:italic>rhtA</jats:italic>) and also genes with predicted functions in energy metabolism (e.g.,<jats:italic>fixN3</jats:italic>,<jats:italic>fixP3</jats:italic>, and<jats:italic>qxtAB</jats:italic>) and exopolysaccharide production (e.g.,<jats:italic>exoY</jats:italic>and<jats:italic>exoN</jats:italic>) were found in this group of genes. In addition, the iron deficiency response of<jats:italic>S. meliloti</jats:italic>also involved<jats:italic>rirA</jats:italic>-independent expression changes, including repression of the<jats:italic>S. meliloti</jats:italic>flagellar regulon. Finally, the RirA modulon also includes genes that are not iron responsive, including a gene cluster putatively involved in Fe-S cluster formation (<jats:italic>sufA</jats:italic>,<jats:italic>sufS</jats:italic>,<jats:italic>sufD</jats:italic>,<jats:italic>sufC</jats:italic>, and<jats:italic>sufB</jats:italic>).</jats:p>
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author Chao, Tzu-Chiao, Buhrmester, Jens, Hansmeier, Nicole, Pühler, Alfred, Weidner, Stefan
author_facet Chao, Tzu-Chiao, Buhrmester, Jens, Hansmeier, Nicole, Pühler, Alfred, Weidner, Stefan, Chao, Tzu-Chiao, Buhrmester, Jens, Hansmeier, Nicole, Pühler, Alfred, Weidner, Stefan
author_sort chao, tzu-chiao
container_issue 10
container_start_page 5969
container_title Applied and Environmental Microbiology
container_volume 71
description <jats:title>ABSTRACT</jats:title><jats:p>A regulatory network of<jats:italic>Sinorhizobium meliloti</jats:italic>genes involved in adaptation to iron-limiting conditions and the involvement of the rhizobial iron regulator gene (<jats:italic>rirA</jats:italic>) were analyzed by mutation and microarray analyses. A constructed<jats:italic>S. meliloti rirA</jats:italic>mutant exhibited growth defects and enhanced H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub>sensitivity in the presence of iron, but symbiotic nitrogen fixation was not affected. To identify iron-responsive and RirA-regulated<jats:italic>S. meliloti</jats:italic>genes, a transcriptome approach using whole-genome microarrays was used. Altogether, 45 genes were found to be jointly derepressed by mutation of<jats:italic>rirA</jats:italic>and under different iron-limited conditions. As expected, a number of genes involved in iron transport (e.g.,<jats:italic>hmuPSTU</jats:italic>,<jats:italic>shmR</jats:italic>,<jats:italic>rhbABCDEF</jats:italic>,<jats:italic>rhtX</jats:italic>, and<jats:italic>rhtA</jats:italic>) and also genes with predicted functions in energy metabolism (e.g.,<jats:italic>fixN3</jats:italic>,<jats:italic>fixP3</jats:italic>, and<jats:italic>qxtAB</jats:italic>) and exopolysaccharide production (e.g.,<jats:italic>exoY</jats:italic>and<jats:italic>exoN</jats:italic>) were found in this group of genes. In addition, the iron deficiency response of<jats:italic>S. meliloti</jats:italic>also involved<jats:italic>rirA</jats:italic>-independent expression changes, including repression of the<jats:italic>S. meliloti</jats:italic>flagellar regulon. Finally, the RirA modulon also includes genes that are not iron responsive, including a gene cluster putatively involved in Fe-S cluster formation (<jats:italic>sufA</jats:italic>,<jats:italic>sufS</jats:italic>,<jats:italic>sufD</jats:italic>,<jats:italic>sufC</jats:italic>, and<jats:italic>sufB</jats:italic>).</jats:p>
doi_str_mv 10.1128/aem.71.10.5969-5982.2005
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spelling Chao, Tzu-Chiao Buhrmester, Jens Hansmeier, Nicole Pühler, Alfred Weidner, Stefan 0099-2240 1098-5336 American Society for Microbiology Ecology Applied Microbiology and Biotechnology Food Science Biotechnology http://dx.doi.org/10.1128/aem.71.10.5969-5982.2005 <jats:title>ABSTRACT</jats:title><jats:p>A regulatory network of<jats:italic>Sinorhizobium meliloti</jats:italic>genes involved in adaptation to iron-limiting conditions and the involvement of the rhizobial iron regulator gene (<jats:italic>rirA</jats:italic>) were analyzed by mutation and microarray analyses. A constructed<jats:italic>S. meliloti rirA</jats:italic>mutant exhibited growth defects and enhanced H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub>sensitivity in the presence of iron, but symbiotic nitrogen fixation was not affected. To identify iron-responsive and RirA-regulated<jats:italic>S. meliloti</jats:italic>genes, a transcriptome approach using whole-genome microarrays was used. Altogether, 45 genes were found to be jointly derepressed by mutation of<jats:italic>rirA</jats:italic>and under different iron-limited conditions. As expected, a number of genes involved in iron transport (e.g.,<jats:italic>hmuPSTU</jats:italic>,<jats:italic>shmR</jats:italic>,<jats:italic>rhbABCDEF</jats:italic>,<jats:italic>rhtX</jats:italic>, and<jats:italic>rhtA</jats:italic>) and also genes with predicted functions in energy metabolism (e.g.,<jats:italic>fixN3</jats:italic>,<jats:italic>fixP3</jats:italic>, and<jats:italic>qxtAB</jats:italic>) and exopolysaccharide production (e.g.,<jats:italic>exoY</jats:italic>and<jats:italic>exoN</jats:italic>) were found in this group of genes. In addition, the iron deficiency response of<jats:italic>S. meliloti</jats:italic>also involved<jats:italic>rirA</jats:italic>-independent expression changes, including repression of the<jats:italic>S. meliloti</jats:italic>flagellar regulon. Finally, the RirA modulon also includes genes that are not iron responsive, including a gene cluster putatively involved in Fe-S cluster formation (<jats:italic>sufA</jats:italic>,<jats:italic>sufS</jats:italic>,<jats:italic>sufD</jats:italic>,<jats:italic>sufC</jats:italic>, and<jats:italic>sufB</jats:italic>).</jats:p> Role of the Regulatory Gene<i>rirA</i>in the Transcriptional Response of<i>Sinorhizobium meliloti</i>to Iron Limitation Applied and Environmental Microbiology
spellingShingle Chao, Tzu-Chiao, Buhrmester, Jens, Hansmeier, Nicole, Pühler, Alfred, Weidner, Stefan, Applied and Environmental Microbiology, Role of the Regulatory GenerirAin the Transcriptional Response ofSinorhizobium melilotito Iron Limitation, Ecology, Applied Microbiology and Biotechnology, Food Science, Biotechnology
title Role of the Regulatory GenerirAin the Transcriptional Response ofSinorhizobium melilotito Iron Limitation
title_full Role of the Regulatory GenerirAin the Transcriptional Response ofSinorhizobium melilotito Iron Limitation
title_fullStr Role of the Regulatory GenerirAin the Transcriptional Response ofSinorhizobium melilotito Iron Limitation
title_full_unstemmed Role of the Regulatory GenerirAin the Transcriptional Response ofSinorhizobium melilotito Iron Limitation
title_short Role of the Regulatory GenerirAin the Transcriptional Response ofSinorhizobium melilotito Iron Limitation
title_sort role of the regulatory gene<i>rira</i>in the transcriptional response of<i>sinorhizobium meliloti</i>to iron limitation
title_unstemmed Role of the Regulatory GenerirAin the Transcriptional Response ofSinorhizobium melilotito Iron Limitation
topic Ecology, Applied Microbiology and Biotechnology, Food Science, Biotechnology
url http://dx.doi.org/10.1128/aem.71.10.5969-5982.2005