Query: NC_007514:904565 Chlorobium chlorochromatii CaD3, complete genome
Lineage: Chlorobium chlorochromatii; Chlorobium; Chlorobiaceae; Chlorobiales; Chlorobi; Bacteria
General Information: Chlorobium chlorochromatii CaD3 was isolated from a phototrophic consortia obtained from a freshwater lake in Germany. Chlorobium chlorochromatii is an green sulfur bacterium isolated from low temperature anaerobic fresh water habitats. This organism grows as part of a phototrophic consortium which consists of a colorless central bacterium surrounded by chlorosome-containing green sulfur epibionts. This organism is able to be grown in pure culture therefore is not an obligate symbiont. This organism is an obligate anaerobic phototroph able to fix nitrogen.
Subject: NC_006142:994753 Rickettsia typhi str. Wilmington, complete genome
Lineage: Rickettsia typhi; Rickettsia; Rickettsiaceae; Rickettsiales; Proteobacteria; Bacteria
General Information: This genus, like other Rickettsial organisms such as Neorickettsia and Anaplasma, is composed of obligate intracellular pathogens. The latter is composed of two organisms, Rickettsia prowazekii and Rickettsia typhi. The bacteria are transmitted via an insect, usually a tick, to a host organism, in this case humans, where they target endothelial cells and sometimes macrophages. They attach via an adhesin, rickettsial outer membrane protein A, and are internalized where they persist as cytoplasmically free organisms. Transovarial transmission (from mother to offspring) occurs in the invertebrate host. Rickettsia typhi causes murine typhus and is an obligate intracellular pathogen that infects both the flea vector and hosts such as human, rat, and mouse. In the flea vector, the bacterium penetrates the gut epithelial barrier and is found in the feces which become infective.