Query: NC_014328:4546390 Clostridium ljungdahlii ATCC 49587 chromosome, complete genome Lineage: Clostridium ljungdahlii; Clostridium; Clostridiaceae; Clostridiales; Firmicutes; Bacteria General Information: This strain was isolated from chicken yard waste and is studied for its ability to produce ethanol. This acetogenic species has the ability to convert carbon monoxide into ethanol. The yield of this process has been increased substantially in the laboratory by using a dual-fermentation system. A methanogenic conversion step has also been designed for utilizing some of the waste products generated during the synthetic process.
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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.