Simultaneous Assimilation and Denitrification of Nitrate by Bradyrhizobium japonicum
نویسندگان
چکیده
منابع مشابه
Emerging complexity in the denitrification regulatory network of Bradyrhizobium japonicum.
Bradyrhizobium japonicum is a Gram-negative soil bacterium symbiotically associated with soya bean plants, which is also able to denitrify under free-living and symbiotic conditions. In B. japonicum, the napEDABC, nirK, norCBQD and nosRZDYFLX genes which encode reductases for nitrate, nitrite, nitric oxide and nitrous oxide respectively are required for denitrification. Similar to many other de...
متن کاملAnaerobic Reduction of Nitrate to Nitrous Oxide Is Lower in Bradyrhizobium japonicum than in Bradyrhizobium diazoefficiens
When soil oxygen levels decrease, some bradyrhizobia use denitrification as an alternative form of respiration. Bradyrhizobium diazoefficiens (nos+) completely denitrifies nitrate (NO3-) to dinitrogen, whereas B. japonicum (nos-) is unable to reduce nitrous oxide to dinitrogen. We found that anaerobic growth with NO3- as the electron acceptor was significantly lower in B. japonicum than in B. d...
متن کاملThe Bradyrhizobium japonicum napEDABC genes encoding the periplasmic nitrate reductase are essential for nitrate respiration.
The napEDABC gene cluster that encodes the periplasmic nitrate reductase from Bradyrhizobium japonicum USDA110 has been isolated and characterized. napA encodes the catalytic subunit, and the napB and napC gene products are predicted to be a soluble dihaem c and a membrane-anchored tetrahaem c-type cytochrome, respectively. napE encodes a transmembrane protein of unknown function, and the napD ...
متن کاملThe Global Response Regulator RegR Controls Expression of Denitrification Genes in Bradyrhizobium japonicum
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 ana...
متن کاملThe complete denitrification pathway of the symbiotic, nitrogen-fixing bacterium Bradyrhizobium japonicum.
Denitrification is an alternative form of respiration in which bacteria sequentially reduce nitrate or nitrite to nitrogen gas by the intermediates nitric oxide and nitrous oxide when oxygen concentrations are limiting. In Bradyrhizobium japonicum, the N(2)-fixing microsymbiont of soya beans, denitrification depends on the napEDABC, nirK, norCBQD, and nosRZDFYLX gene clusters encoding nitrate-,...
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ژورنال
عنوان ژورنال: Microbiology
سال: 1989
ISSN: 1350-0872,1465-2080
DOI: 10.1099/00221287-135-1-189