Species code:	PROM9
Taxonomy:	Bacteria; Cyanobacteria; Prochlorales; Prochlorococcaceae; Prochlorococcus (TaxID: 74546) [NEWT/ NCBI]
Description:	Prochlorococcus, a fairly recently discovered cyanobacterium (1988), is the smallest known free-living photosynthetic prokaryote. Despite its small size it contributes significantly to global nutrient cycling. It is unique among cyanobacteria in using divinyl chlorophyll a and b as the major light-harvesting pigments, and harvests light with chlorophyll-binding antenna proteins (Pcb proteins) instead of the phycobilisomes used by most cyanobacteria. It is found in low- to mid-latitude oceans and seas, thriving in nutrient-poor waters and at greater depths than its close relative Synechococcus (down to 135m for Prochlorococcus, but only 95m for Synechococcus). Prochlorococcus can be differentiated into low-light (LL) and high-light (HL)-adapted ecotypes that have different physiologies and exist at different depths. Comparison of 12 whole genomes suggests the core genome contains about 1250 genes, while the pan-genome will have more than 5800 genes. This HL-adapted strain was isolated from the Gulf Stream at 135m in July 1993, and has a chlorophyll b/a ratio of 0.34. It belongs to low chlorophyll b/a clade II.
Properties:	Presence of flagella: No Interaction: No Number of membranes: 2 Number of inteins:0
Statistics:	Number of PROM9 entries in the UniProt Knowledgebase: 1960 (327 in UniProtKB/Swiss-Prot + 1633 in UniProtKB/TrEMBL)

Genome structure:	Chromosome EMBL accession number CP000111 (circular; 1,709,204 bp) (download entry) (download Genome Reviews).
Reference(s):	[1] Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C., Glavina T., Hammon N., Israni S., Pitluck S., Thiel J., Schmutz J., Larimer F., Land M., Kyrpides N., Lykidis A., Richardson P. ; "Complete sequence of Prochlorococcus marinus str. MIT 9312."; Submitted (JUL-2005) to the EMBL/GenBank/DDBJ databases.
Web links:	Official genome site(s): http://genome.jgi-psf.org/finished_microbes/pro_2/pro_2.annotation.html http://chisholmlab.mit.edu/genomes/ Other web sites: CyanoBase: http://genome.kazusa.or.jp/cyanobase/PMT9312 Entrez Genome Project: http://www.ncbi.nlm.nih.gov/sites/entrez?Db=genomeprj&Cmd=DetailsSearch&Term=txid74546%5Borgn%5D Genome Atlas: http://www.cbs.dtu.dk/services/gwBrowser/project.php?pid=13910 GIB (DDBJ): http://gib.genes.nig.ac.jp/single/index.php?spid=Pmar_MIT9312 Karyn's Genomes: http://www.ebi.ac.uk/2can/genomes/bacteria/Prochlorococcus_marinus.html PEDANT: http://pedant.gsf.de:3345/pedant3htmlview/pedant3view?Method=start_method&Db=p3_p13910_Pro_marin  EBI Proteome Analysis page

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