Query: NC_010803:2444120 Chlorobium limicola DSM 245, complete genome Lineage: Chlorobium limicola; Chlorobium; Chlorobiaceae; Chlorobiales; Chlorobi; Bacteria General Information: Isolated from Gilroy Hot Spring. The green sulfur bacteria (GSB; Phylum Chlorobi ) are commonly found in illuminated, stratified, and anoxic aquatic environments, sediments, and other sulfide-rich environments including hot springs. This bacterium has been used to model a variety of enzyme and reaction center pathways, including ATP-citrate lyase, isocitrate dehydrogenase, and the reverse Krebs cycle used in photosynthesis. Now called the "reductive carbolic acid cycle", this was found to be the sole carbon dioxide assimilation pathway in other green sulfur bacteria since its discovery.
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General Information: These cyanobacteria are bluegreen algae that are capable of fixing carbon and nitrogen. They form long filaments and can be found worldwide in various aquatic environments as well as some terrestrial ones. These bacteria can form a variety of differentiated cell types, including spore-like cells (akinetes), small motile filaments (hormongia) and most importantly, heterocysts that are nitrogen-producing cells. The heterocyst produces multiple layers outside of its cell wall, shuts down photosystem II in order to inhibit oxygenic photosynthesis and ramps up metabolism in order to use up the oxygen present. Heterocysts donate fixed nitrogen compounds as amino acids to neighboring cells and in return receive a photosynthetically produced carbon source such as sucrose. These organisms produce toxic blooms in aquatic environments that are harmful or fatal to animals and humans due to the various cyanotoxins they produce. Anabaena variabilis is a filamentous heterocyst-forming cyanobacterium that fixes nitrogen and CO2 using the energy of sunlight via oxygen-evolving plant-type photosynthesis. In addition, this organism has been studied extensively for the production of hydrogen using solar energy.