Query: NC_010531:428000 Polynucleobacter necessarius STIR1, complete genome
Lineage: Polynucleobacter necessarius; Polynucleobacter; Burkholderiaceae; Burkholderiales; Proteobacteria; Bacteria
General Information: This strain is an obligate intracellular endosymbiont of the cilliate Euplotes aediculatus. This group of organisms is common in freshwater, comprising up to 60% of the bacteria in freshwater habitats. Polynucleobacter species are also known to be endosymbionts of ciliates. These strains live within the cytoplasm and are essential for their host organisms.
Subject: NC_002696:2829002 Caulobacter crescentus CB15, complete genome
Lineage: Caulobacter vibrioides; Caulobacter; Caulobacteraceae; Caulobacterales; Proteobacteria; Bacteria
General Information: Bacterium that undergoes asymmetric cell division and differentiation. Caulobacter vibroides, also known as Caulobacter crescentus, inhabits aquatic environments and plays an important part in biogeochemical cycling of organic nutrients. This bacterium undergoes an unusual developmental cycle in which a swarming motile cell becomes a stalked cell that is attached to a solid surface. The stalked cell then undergoes asymmetric cell division and produces one flagellated motile daughter cell and one stalked daughter cell. Thus, the asymmetric processes in this organism provide useful models for differentiation and development. This organism also contains a number of energy-dependent transport system, presumably enabling growth in the substrate-sparse aquatic environments that it lives in.