Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Autoregulation of fixK2 gene expression in Bradyrhizobium japonicum

ABSTRACT: Expression data from B. japonicum bll2758::aphII strain (7414) grown micro-oxically. This study includes also the expression data of a fixK2 and a fixJ mutant grown in free-living micro-oxic condition (samples GSM313721 to GSM313734 in GEO record number GSE12491) and the wild type strain grown micro-oxically (samples GSM210246 to GSM210268 in GEO record number GSE8478). B. japonicum bll2758::aphII strain (7414) transcriptome was determined. This study includes also the expression data of a fixK2 and a fixJ mutant grown in free-living micro-oxic condition (samples GSM313721 to GSM313734 in GEO record number GSE12491) and the wild type strain grown micro-oxically (samples GSM210246 to GSM210268 in GEO record number GSE8478).

ORGANISM(S): Bradyrhizobium japonicum

SUBMITTER: Hans-Martin Fischer

PROVIDER: E-GEOD-21400 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Autoregulation of fixK(2) gene expression in Bradyrhizobium japonicum.

Reutimann Luzia L Mesa Socorro S Hennecke Hauke H

Molecular genetics and genomics : MGG 20100604 1

Several essential Bradyrhizobium japonicum genes for a symbiotic, nitrogen-fixing root-nodule symbiosis are positively controlled under micro-oxic conditions by the FixLJ-FixK(2) regulatory cascade. Negative control is exerted by reactive oxygen species at the level of the FixK(2) protein. Furthermore, we noticed that fixK (2) gene expression is increased in a fixK (2) mutant, suggesting that FixK(2) in the wild type has a negative effect, directly or indirectly, on its own expression. To possib ...[more]

PMID: 20524010

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Project description:Bradyrhizobium japonicum RegSR regulatory proteins belong to the family of two-component regulatory systems, and orthologs are present in many Proteobacteria where they globally control gene expression mostly in a redox-responsive manner. In this work, we have performed a transcriptional profiling of wild-type and regR mutant cells grown under anoxic denitrifying conditions. The comparative analyses of wild-type and regR strains revealed that almost 620 genes induced in the wild type under denitrifying conditions were regulated (directly or indirectly) by RegR, pointing out the important role of this protein as a global regulator of denitrification. Genes controlled by RegR included nor and nos structural genes encoding nitric oxide and nitrous oxide reductase, respectively, genes encoding electron transport proteins such as cycA (blr7544), or cy2 (bll2388), genes involved in nitric oxide detoxification (blr2806-09), copper homeostasis (copCAB), as well as two regulatory genes (bll3466, bll4130). Purified RegR interacted with the promoters of norC (blr3214), nosR (blr0314), a fixK-like gene (bll3466), and bll4130 which encodes a LysR-type regulator. By using fluorescently labeled oligonucleotide extension (FLOE), we were able to identify two transcriptional start sites located at about 35 (P1) and 22 (P2) bp upstream of the putative translational start codon of norC. P1 matched with the previously mapped 5M-bM-^@M-^Yend of norC mRNA which we demonstrate in this work to be under FixK2 control. P2 is a start site modulated by RegR and specific for anoxic conditions. Moreover, qRT-PCR experiments, expression studies with a norC-lacZ fusion, and heme c-staining analyses revealed that anoxia and nitrate are required for RegR-dependent induction of nor genes, and that this control is independent of the sensor protein RegS. A total of eight Affymetrix GeneChips are included in this study. Per strain (wild-type B. japonicum 110spc4, delta regR mutant 2426) four biological replicates were processed and analyzed. Strains were grown under anoxic conditions in Bergersen minimal medium supplemented with succinate as carbon source and KNO3 as terminal electron acceptor. For comparison, a microarray expression dataset generated with B. japonicum wild-type (Hauser et al., Mol. Genet. Genomics 278:255-271, 2007) and delta regR mutant cells (Lindemann et al., J. Bacteriol. 189:8928-8943, 2007) was used.

Dataset Information

Autoregulation of fixK2 gene expression in Bradyrhizobium japonicum

Publications

Autoregulation of fixK(2) gene expression in Bradyrhizobium japonicum.

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