Bacteroides fragilis str. B1 (UDC16-1)

Bacteroides fragilis str. B1 (UDC16-1) is a Gram-negative, rod-shaped bacterium characterized as a chemoorganotroph, deriving its energy from organic compounds. This species is strictly anaerobic, thriving in environments devoid of oxygen, which is indicative of its adaptation to host-associated habitats. B. fragilis str. B1 is non-motile and does not possess flagella, which suggests a lifestyle that does not require movement through its environment. Instead, it exists primarily as single cells rather than forming clusters or chains. The bacterium has a mesophilic temperature range, with an optimal growth temperature of 37°C, aligning with the typical mammalian body temperature, further supporting its association with host organisms. Genetically, Bacteroides fragilis str. B1 contains one replicon and has a double-membrane structure. This structural arrangement is typical of Gram-negative bacteria and plays a role in its interactions within the host environment. Ecologically, B. fragilis is described as free-living, which may suggest its role in the gut microbiota where it helps in the digestion of complex polysaccharides and contributes to the overall health of the host. Its presence in the host-associated environment underlines the importance of this organism in maintaining gut homeostasis and its potential implications in health and disease. The accession number for this strain is JGDU00000000.1, which provides a reference for further genetic and genomic studies.