Helicobacter pylori surface antigens and urease enzyme

Helicobacter pylori surface antigens and the urease enzyme are essential components for the survival, colonization, and pathogenicity of the H. pylori bacterium within the human stomach. The urease enzyme, a high-molecular-weight multimeric metalloenzyme, plays a pivotal role by hydrolyzing urea into ammonia and carbon dioxide, which neutralizes gastric acid and creates a protective neutral-pH microenvironment around the bacterium (Mobley et al., 1995, PubMed). Surface antigens, such as the cytotoxin-associated gene A (CagA) and vacuolating cytotoxin A (VacA), are critical virulence factors that disrupt host cell signaling, induce inflammation, and promote oncogenesis (Amieva & Peek, 2016, Nature Reviews Microbiology). These molecules are the primary targets for non-invasive diagnostic tests, including the urea breath test and stool antigen assays, which detect the presence of the enzyme's activity or the proteins themselves (Mayo Clinic, 2023). Therapeutically, while antibiotics are the mainstay for eradication, the urease enzyme is specifically targeted by inhibitors like acetohydroxamic acid to impair bacterial survival (PubChem, 2024). Furthermore, these antigens are the focus of extensive vaccine research aimed at inducing protective immunity to prevent chronic infection and associated gastric cancers (Sutton & Boag, 2019, Vaccine).

Other names

H. pylori antigensUrease (UreA/UreB)Cytotoxin-associated gene A (CagA)Vacuolating cytotoxin A (VacA)Blood group antigen-binding adhesin (BabA)Sialic acid-binding adhesin (SabA)Outer inflammatory protein A (OipA)

Inhibition of urease-mediated acid neutralization; disruption of bacterial cell wall synthesis; inhibition of bacterial protein synthesis; induction of DNA damage; blocking of bacterial adhesion to gastric epithelium.