Species code:	BRASB
Taxonomy:	Bacteria; Proteobacteria; Alphaproteobacteria; Rhizobiales; Bradyrhizobiaceae; Bradyrhizobium (TaxID: 288000) [NEWT/ NCBI]
Description:	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).
Properties:	Presence of flagella: not known Interaction: Plant symbiont Number of membranes: 2 Number of inteins:0
Statistics:	Number of BRASB entries in the UniProt Knowledgebase: 7567 (325 in UniProtKB/Swiss-Prot + 7242 in UniProtKB/TrEMBL)

Genome structure:	• Chromosome EMBL accession number CP000494 (circular; 8,264,687 bp) (download entry) (download Genome Reviews). • Plasmid pBBta01 EMBL accession number CP000495 (circular; 228,826 bp) (download entry) (download Genome Reviews).
Reference(s):	[1] PubMed=17540897; [ NCBI , EBI , Israel , Japan ] Giraud E., Moulin L., Vallenet D., Barbe V., Cytryn E., Avarre J.-C., Jaubert M., Simon D., Cartieaux F., Prin Y., Bena G., Hannibal L., Fardoux J., Kojadinovic M., Vuillet L., Lajus A., Cruveiller S., Rouy Z., Mangenot S., Segurens B., Dossat C., Franck W.L., Chang W.-S., Saunders E., Bruce D., Richardson P., Normand P., Dreyfus B., Pignol D., Stacey G., Emerich D., Vermeglio A., Medigue C., Sadowsky M. ; "Legumes symbioses: absence of nod genes in photosynthetic bradyrhizobia."; Science 316:1307-1312(2007).
Web links:	Official genome site(s): http://genome.jgi-psf.org/finished_microbes/bra_b/bra_b.home.html Other web sites: Entrez Genome Project: http://www.ncbi.nlm.nih.gov/sites/entrez?Db=genomeprj&Cmd=DetailsSearch&Term=txid288000%5Borgn%5D GIB (DDBJ): http://gib.genes.nig.ac.jp/single/index.php?spid=Brad_BTAI1 RhizoDB: http://xbase.bham.ac.uk/rhizodb/genome.pl?id=964  EBI Proteome Analysis page

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