Bradyrhizobium sp. ORS278

Names Bradyrhizobium sp. ORS278
Accession numbers NC_009445
Background Bradyrhizobium sp. strain BTAi1, a photosynthetic bacterium, nodulates the stems of the aquatic legume Aeschynomene indica, and was isolated in North America. Group I Bradyrhizobium form nodules on all stem-nodulating Aeschynomene species, and are known to contain the nodulation-inducing nodABC genes, whereas group II strains (among them strain BTAi1) are restricted to a few species. The photosynthetic Bradyrhizobia form a separate phylum and may be closer to Rhodopseudomonas than to non-photosynthetic Bradyrhizobia. Unlike the closely related Bradyrhizobium sp. strain ORS278 (BRASO), strain BTAi1 has a 230kb plasmid. There are no nod, nif or fix genes in BTAi1, which therefore must initiate nodulation in a quite different fashion than the nod-containing nitrogen-fixing bacteria. Despite this absence, nodules on Aeschynomene synthesize leghemoglobin, have nitrogenase activity and transfer fixed N2 into the plant host. Interestingly, these photosynthetic Bradyrhizobia naturally associate with a wild rice species, Oryza breviligulata that co-inhabits some tropical marshes of Africa with Aeschynomenes. Association with BTAi1 increases production slightly. Strain BTAi1 produces the carotenoid spirilloxanthin (supplementary information from PubMed 11097925). (EBI Integr8)
Strain ORS278
Complete Yes
Sequencing centre (13-NOV-2004) National Center for Biotechnology Information, NIH, Bethesda, MD 20894, USA
(21-NOV-2006) Genoscope - Centre National de Sequencage : BP 191 91006 EVRY cedex - FRANCE (E-mail :
Sequencing quality Level 6: Finished
Sequencing depth NA
Sequencing method Sanger
Isolation site Stem nodules of Aeschynomene indica
Isolation country NA
Number of replicons 1
Gram staining properties Negative
Shape Bacilli
Mobility Yes
Flagellar presence NA
Number of membranes 2
Oxygen requirements Aerobic
Optimal temperature NA
Temperature range Mesophilic
Habitat HostAssociated
Biotic relationship Symbiotic
Host name NA
Cell arrangement NA
Sporulation NA
Metabolism Nitrogen fixation
Stores polyhydroxybutyrate
Energy source Photosynthetic
Diseases None
Pathogenicity No
Glycolysis / Gluconeogenesis
Citrate cycle (TCA cycle)
Pentose phosphate pathway
Fructose and mannose metabolism
Fatty acid metabolism
Synthesis and degradation of ketone bodies
Purine metabolism
Pyrimidine metabolism
Alanine, aspartate and glutamate metabolism
Glycine, serine and threonine metabolism
Cysteine and methionine metabolism
Valine, leucine and isoleucine degradation
Geraniol degradation
Valine, leucine and isoleucine biosynthesis
Lysine biosynthesis
Arginine and proline metabolism
Histidine metabolism
Tyrosine metabolism
Phenylalanine metabolism
Chlorocyclohexane and chlorobenzene degradation
Benzoate degradation
Bisphenol degradation
Tryptophan metabolism
Phenylalanine, tyrosine and tryptophan biosynthesis
beta-Alanine metabolism
Selenocompound metabolism
D-Glutamine and D-glutamate metabolism
D-Arginine and D-ornithine metabolism
D-Alanine metabolism
Glutathione metabolism
Starch and sucrose metabolism
Streptomycin biosynthesis
Lipopolysaccharide biosynthesis
Peptidoglycan biosynthesis
Glycerophospholipid metabolism
Pyruvate metabolism
Xylene degradation
Toluene degradation
Polycyclic aromatic hydrocarbon degradation
Chloroalkane and chloroalkene degradation
Naphthalene degradation
Aminobenzoate degradation
Glyoxylate and dicarboxylate metabolism
Nitrotoluene degradation
Propanoate metabolism
Styrene degradation
Butanoate metabolism
C5-Branched dibasic acid metabolism
One carbon pool by folate
Carbon fixation in photosynthetic organisms
Thiamine metabolism
Riboflavin metabolism
Vitamin B6 metabolism
Nicotinate and nicotinamide metabolism
Pantothenate and CoA biosynthesis
Biotin metabolism
Lipoic acid metabolism
Folate biosynthesis
Atrazine degradation
Porphyrin and chlorophyll metabolism
Terpenoid backbone biosynthesis
Limonene and pinene degradation
Nitrogen metabolism
Sulfur metabolism
Caprolactam degradation
Aminoacyl-tRNA biosynthesis
Biosynthesis of unsaturated fatty acids
Biosynthesis of ansamycins