Helicobacter pylori cell surface and secreted enzymes

Helicobacter pylori cell surface and secreted enzymes represent a critical suite of virulence factors that enable the bacterium to colonize and persist within the hostile, acidic environment of the human stomach. The most prominent member, urease, is an enzyme that hydrolyzes urea to produce ammonia, thereby neutralizing local gastric acid and facilitating bacterial survival (Mobley et al., 1995). Other key components include the vacuolating cytotoxin A (VacA), which induces host cell vacuolation and apoptosis, and the cytotoxin-associated gene A (CagA) protein, which is injected into host cells to disrupt signaling pathways and promote oncogenesis (Cover & Blanke, 2005). Additionally, secreted proteases like High-temperature requirement A (HtrA) play a role in degrading epithelial junction proteins, allowing the bacteria to penetrate the gastric barrier (Backert et al., 2016). These enzymes are primary targets for diagnostic assays, such as the urea breath test, and are considered significant therapeutic targets for the treatment of chronic gastritis, peptic ulcers, and gastric adenocarcinoma (Suerbaum & Michetti, 2002). While current treatment regimens primarily utilize broad-spectrum antibiotics, the development of specific inhibitors for these enzymes, such as urease inhibitors like acetohydroxamic acid, remains an area of active research to combat increasing antibiotic resistance.

Other names

Helicobacter pylori virulence factorsH. pylori secretomeH. pylori surface proteinsHelicobacter pylori extracellular enzymes

Competitive inhibition of the urease enzyme to prevent ammonia production and gastric acid neutralization; inhibition of the HtrA protease to prevent cleavage of E-cadherin and disruption of the gastric epithelial barrier; neutralization of the VacA toxin to prevent host cell vacuolation and apoptosis.