Query: NC_006677:1596560 Gluconobacter oxydans 621H, complete genome Lineage: Gluconobacter oxydans; Gluconobacter; Acetobacteraceae; Rhodospirillales; Proteobacteria; Bacteria General Information: Industrially useful bacterium. Gluconobacter oxydans is a member of the Acetobacteraceae family within the alpha proteobacteria and can be isolated from flowers, fruits, and fermented beverages. This organism uses membrane-associated dehydrogenases to incompletely oxidize a wide variety of carbohydrates and alcohols. Oxidation occurs in the periplasm with the products being released into the medium via outer membrane porins and the electrons entering the electron transport chain. Able to oxidize large amounts of substrates, making it useful for industrial purposes. Among other applications, it has been used to produce 2-ketogluconic for iso-ascorbic acid production, 5-ketogluconic acid from glucose for tartaric acid production, and L-sorbose from sorbitol for vitamin C synthesis.
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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.