Helicobacter pylori ATP synthase (F1F0-ATPase)

Helicobacter pylori ATP synthase (F1F0-ATPase) is a critical multi-subunit enzyme complex that catalyzes the synthesis of adenosine triphosphate (ATP) from adenosine diphosphate (ADP) and inorganic phosphate, driven by a proton-motive force across the bacterial inner membrane (PMC178306). Unlike many other bacteria, H. pylori relies heavily on this complex for pH homeostasis, as the enzyme helps maintain an internal neutral pH necessary for survival within the highly acidic environment of the human stomach (Beil et al., 1995). Inhibition of either the catalytic F1 sector or the proton-conducting F0 sector leads to rapid depletion of cellular energy stores and the collapse of the electrochemical gradient, resulting in bacterial death. While standard treatments for H. pylori infection include proton pump inhibitors (PPIs) that target the host H+/K+-ATPase, studies have shown that drugs like omeprazole and bismuth salts also directly inhibit the bacterial F1-ATPase (PMID: 7667394). Given the increasing prevalence of multidrug-resistant H. pylori, this enzyme is an attractive target for novel antibiotic development, though selectivity is required to avoid cross-reactivity with human mitochondrial ATP synthase.

Other names

F-type ATPaseH+-transporting ATP synthaseProton-translocating ATPaseATP synthesis complexF1F0-ATP synthaseH+-ATPase

Drugs targeting this complex work by inhibiting the catalytic activity of the F1 domain or blocking the proton-conducting channel of the F0 domain (PMC3330664; PMID: 7667394). This inhibition prevents the synthesis of ATP and disrupts the bacterium's ability to regulate its internal pH against the gastric acid gradient, leading to metabolic failure and cell death (PMC9037466; PMC8643567).