Escherichia coli K-12

Escherichia coli K-12 is a Gram-negative, rod-shaped bacterium that typically occurs in pairs or as single cells. This strain thrives optimally at 37.0°C, which corresponds to the normal physiological temperature of warm-blooded hosts. As a facultative anaerobe, E. coli K-12 is capable of growth in both aerobic and anaerobic conditions, allowing it to adapt to varying environments within its host-associated habitat. E. coli K-12 is widely used as a model organism in microbiology and genetics due to its well-characterized genome and ease of cultivation. Its ability to survive and proliferate in diverse conditions makes it an invaluable tool for studying cellular processes and gene expression. The strain's adaptability may also reflect its evolutionary success and the complex interactions it has with its host environment. Interestingly, the facultative anaerobic nature of E. coli K-12 enables it to play a role in the microbial community of the gut, where it can switch between utilizing oxygen and fermentative metabolism, thereby influencing the overall dynamics of gut microbiota. This versatility not only sheds light on the bacterium's ecological role but also underscores its significance in understanding microbial interactions and community structure within host-associated environments.