Fig. 2
From: Gut microbes involvement in gastrointestinal cancers through redox regulation
Redox reactions in bacteria regulate the redox level of the gastrointestinal tract. Bacteria obtain the energy needed for growth through the respiratory chain and transfer electrons in vivo and in vitro through the respiratory chain at the same time, thereby regulating the redox level in vivo and in vitro. Redox regulatory proteins such as HP120 exist in bacteria. Oxidative metabolism in bacteria can affect the production of its metabolites, such as folic acid. Reduced production of folic acid contributes to the occurance of cancer. The change in redox level in the gastrointestinal tract caused by bacteria can also affect the growth of other bacteria