Helicobacter pylori cell wall and enzymes

Helicobacter pylori is a Gram-negative bacterium that colonizes the human stomach, where it is a major causative agent of chronic gastritis, peptic ulcers, and gastric cancer (Kusters et al., 2006). The bacterial cell wall and its associated enzymes are critical for surviving the highly acidic gastric environment and establishing persistent infection. The cell wall, consisting of a peptidoglycan layer and an outer membrane containing lipopolysaccharides, provides essential structural integrity and protection against host immune defenses (Salama et al., 2013). Among its enzymes, urease is the most vital, as it catalyzes the hydrolysis of urea into ammonia to neutralize local gastric acid, creating a habitable microenvironment for the pathogen (Mobley et al., 1995). Other enzymes, such as proteases and phospholipases, facilitate the breakdown of the gastric mucus barrier, enabling bacterial adhesion and tissue damage. Therapeutic strategies often target these components; for instance, beta-lactam antibiotics like amoxicillin disrupt cell wall synthesis, while bismuth compounds can inhibit urease activity and damage the bacterial membrane (Megraud & Lamouliatte, 1992). The presence and activity of these targets also form the basis for gold-standard diagnostic tests, such as the urea breath test (Graham et al., 1987). Given the rising rates of antibiotic resistance, these components remain focal points for the development of novel antimicrobial agents and vaccines.

Other names

Helicobacter pylori cell envelopeH. pylori virulence factorsH. pylori cell wall and enzymes

Drugs targeting this complex act by inhibiting peptidoglycan cross-linking (e.g., amoxicillin), directly inhibiting the urease enzyme to prevent acid neutralization (e.g., bismuth, acetohydroxamic acid), or disrupting the structural integrity of the bacterial cell envelope (Megraud & Lamouliatte, 1992; Mobley et al., 1995; Salama et al., 2013).