Bradyrhizobium japonicum
| Bradyrhizobium japonicum | |
|---|---|
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| Bradyrhizobium japonicum strain USDA 110 on an agar plate. | |
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| Species: | B. japonicum
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| Binomial name | |
| Bradyrhizobium japonicum | |
| Synonyms | |
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Rhizobium japonicum Buchanan 1926 | |
Bradyrhizobium japonicum is a species of legume-root nodulating, microsymbiotic nitrogen-fixing bacterium species. B. japonicum is identified as a DNA homology group (group II).[2]
B. japonicum is able to degrade catechin with formation of phloroglucinol carboxylic acid, further decarboxylated to phloroglucinol, which is dehydroxylated to resorcinol and hydroxyquinol.[citation needed]
B. japonicum possess the nosRZDFYLX gene, which aides in denitrification and has two catalytic subunits - Cu-a and Cu-z (with several histidine residues). It manages an expression cascade that can sense oxygen gradients, termed 'FixJ-FixK2-FixK1.' FixJ positively regulates FixK2, which activates nitrogen respiration genes as well as FixK1. FixK1 mutants are unable to respire from nitrogen due to a defective catatylic copper subunit (Cu-z) in nosRZDFYLX.[3]
References
- ^ Transfer of Rhizobium japonicum Buchanan 1980 to Bradyrhizobium gen. nov., a genus of slow-growing, root nodule bacteria from leguminous plants. Int. J. Syst. Bacteriol., 1982, 32, 136-139.
- ^ A. B. Hollis, W. E. Kloos & G. E. Elkan (1981). "DNA:DNA hybridization studies of Rhizobium japonicum and related Rhizobiaceae". Journal of General Microbiology. 123: 215–222. doi:10.1099/00221287-123-2-215.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ D. Nellen-Anthamatten, P. Rossi; et al. (1998). "Bradyrhizobium japonicum, FixK2, a Crucial Distributor in the FixLJ-Dependent Regulatory Cascade for Control of Genes Inducible by Low Oxygen Levels". [Journal of Bacteriology]. 180 (19): 5251–5255.
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