Query: NC_007577:1047000 Prochlorococcus marinus str. MIT 9312, complete genome Lineage: Prochlorococcus marinus; Prochlorococcus; Prochlorococcaceae; Prochlorales; Cyanobacteria; Bacteria General Information: This strain was isolated by flow cytometry from water collected from the Gulf Stream in the north Atlantic Ocean. Marine cyanobacterium. This non-motile bacterium is a free-living marine organism that is one of the most abundant, as well as the smallest, on earth, and contributes heavily to carbon cycling in the marine environment. This cyanobacterium grows in areas of nitrogen and phosphorus limitation and is unique in that it utilizes divinyl chlorophyll a/b proteins as light-harvesting systems instead of phycobiliproteins. These pigments allow harvesting of light energy from blue wavelengths at low light intensity.
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General Information: This organism was isolated from a calcereous (chalky) rock in Switzerland. Photosynthetic bacterium. This organism is an obligate photoautotroph that lacks thylakoid membranes and probably has its photosynthetic machinery in the cytoplasmic membrane with various components exposed to the periplasm whereas in other cyanobacteria the components are situated in the thylakoid membrane and are exposed to the cytoplasm. This unusual arrangement may be due to the lack of various fatty acids that are found in the thylakoid membrane in other cyanobacteria. It has been predicted that this organism was one of the earliest to diverge from the cyanobacterial line.