Query: NC_007168:2448422 Staphylococcus haemolyticus JCSC1435, complete genome Lineage: Staphylococcus haemolyticus; Staphylococcus; Staphylococcaceae; Bacillales; Firmicutes; Bacteria General Information: Staphylococcus haemolyticus JCSC1435 was isolated from a Japanese inpatient at Juntendo Hospital, Tokyo, in 2000. This strain is a highly resistant strain which has been shown to generate spontaneous antibiotic sensitive mutants. Causes opportunistic infections in humans. Staphylcocci are generally found inhabiting the skin and mucous membranes of mammals and birds. Some members of this genus can be found as human commensals and these are generally believed to have the greatest pathogenic potential in opportunistic infections. Staphylococcus haemolyticus was originally isolated from human skin and traditionally considered to be a nonpathogenic commensal. Recently this organism has been recognized as a pathogen in animals and humans. It is known to be involved in opportunistic infections associated with the implantation of foreign bodies, paticularly in those with compromised immune systems. Resistance to multiple antibiotics has been observed in clinical isolates and it is possible S. haemolyticus could serve a donor or resistance genes to other more virulent staphlococci.
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General Information: This strain is found in the cedar aphid, Cinara cedri. 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.