Antioxidant and redox enzymes of Helicobacter pylori

Helicobacter pylori (H. pylori) utilizes a sophisticated network of antioxidant and redox enzymes to survive the harsh, oxidative environment of the human stomach and the host's immune response. Key components of this system include superoxide dismutase (SodB), catalase (KatA), alkyl hydroperoxide reductase (AhpC), and the thioredoxin (Trx) system (Wang et al., 2006, Free Radical Biology and Medicine). These enzymes neutralize reactive oxygen species (ROS) such as superoxide radicals and hydrogen peroxide, which are generated by neutrophils and macrophages during the inflammatory response (Kusters et al., 2006, Clinical Microbiology Reviews). By maintaining redox homeostasis, these enzymes prevent oxidative damage to the bacterium's DNA, proteins, and lipids, thereby facilitating chronic colonization and contributing to the development of gastritis, peptic ulcers, and gastric adenocarcinoma (Smolka et al., 2012, Frontiers in Biology). Targeting these enzymes is a promising therapeutic strategy, as their inhibition increases the susceptibility of H. pylori to oxidative stress and host-mediated killing. Drugs like auranofin and ebselen have shown potential in inhibiting the thioredoxin reductase (TrxR) of H. pylori, which is essential for its survival and lacks a redundant backup system found in many other organisms (Lu et al., 2013, FASEB Journal).

Other names

Helicobacter pylori antioxidant systemH. pylori redox enzymesOxidative stress defense systemRedox homeostasis proteins

Inhibition of key redox-regulating enzymes (e.g., thioredoxin reductase, catalase, superoxide dismutase) disrupts the bacterium's ability to neutralize host-derived reactive oxygen species, leading to oxidative stress, cellular damage, and bacterial death.