Query: NC_012846:1888000 Bartonella grahamii as4aup, complete genome
Lineage: Bartonella grahamii; Bartonella; Bartonellaceae; Rhizobiales; Proteobacteria; Bacteria
General Information: Bartonella grahamii (strain as4aup) is Gram-negative bacterium isolated from a wood mouse (Apodemus sylvaticus) in central Sweden. Bartonella are human and animal pathogens which infect erythrocytes and can cause angiogenic lesions. These organisms cause diseases in humans such as Oroya fever, Trench fever, endocarditis, and Cat Scratch disease. Transmission of this organism is via the bite of a blood-sucking arthropod. Bartonella grahamii can be isolated from the blood of rodents and is found world wide. Fleas may be the transmission vector for Bartonella grahamii to other rodents. Human disease appears to be rare and associated with an immunocompromised state.
Subject: NC_004545:499709 Buchnera aphidicola str. Bp (Baizongia pistaciae), complete genome
Lineage: Buchnera aphidicola; Buchnera; Enterobacteriaceae; Enterobacteriales; Proteobacteria; Bacteria
General Information: This organism is found in the aphid Baizongia pistaciae. Aphid endosymbiont. 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.