Query: NC_009667:1076718 Ochrobactrum anthropi ATCC 49188 chromosome 1, complete sequence Lineage: Ochrobactrum anthropi; Ochrobactrum; Brucellaceae; Rhizobiales; Proteobacteria; Bacteria General Information: Soil bacterium that can cause opportunistic infections. Ochrobactrum anthropi is an opportunistic human pathogen usually causing infection in association with indwelling medical devices, such as catheters and drainage tubes. This organism and related species have also been isolated from soil, activated sludge, and plants. Ochrobactrum anthropi is a Gram-negative, anaerobic, motile bacterium. A common soil bacteria, it was originally considered as an opportunistic pathogen, causing infections in immunocompromised patients, patients with indwelling catheters or peritoneal dialysis but it is now emerging as a more and more important nosocomial pathogen. The first case of human infection was described in 1980. It has been isolated from blood, the urogenital tract, respiratory tract and eyes, and it can be part of the normal intestinal flora. It is resistant to many antibiotics, especially the beta-lactams.
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General Information: This strain is the symbiont of the aphid Schizaphis graminum and contains a large circular chromosome. Aphid endosymbiont. Almost all aphids contain maternally transmitted bacteriocyte cells, which themselves contain bacteria called Buchnera. The aphids live on a restricted diet (plant sap), rich in carbohydrates, but poor in nitrogenous or other essential compounds. It is believed that the Buchnera provide the essential nutrients the host lacks. Besides a nutritional co-dependence, due to a co-existence of millions of years, Buchnera have lost the ability to produce cell surface components such as lipopolysaccharides. This makes for an obligate endosymbiont relationship between host and Buchnera. Buchnera are prokaryotic cells which belong to the gamma-Proteobacteria, closely related to the Enterobacteriaceae family. Phylogenetic studies using 16S rRNA indicate that the symbiotic relationship was established around 200-250 million years ago. Since Buchnera are closely related to Escherichia coli and Haemophilus influenzae, comparative genomic studies can shed light on the evolutionary mechanisms of intracellular endosymbiosis as well as the different underlying molecular basis between organisms with parasitic behavior and symbionts.