Multiple Helicobacter pylori proteins containing thiol groups

This target refers to a diverse group of essential proteins and enzymes in Helicobacter pylori that contain functional thiol (sulfhydryl) groups. These proteins are critical for the bacterium's survival, including urease, which neutralizes gastric acid, and various proteases and lipases (Ge & Sun, 2007). Bismuth-based drugs, such as bismuth subsalicylate and colloidal bismuth subcitrate, target these proteins by binding to the sulfur atoms in cysteine residues with high affinity (Sun et al., 1997). This binding leads to the inactivation of multiple enzymatic pathways, disruption of the bacterial cell wall, and inhibition of protein synthesis. Because bismuth targets multiple proteins simultaneously, it is highly effective at eradicating H. pylori and has a low risk of resistance development. Clinically, targeting these proteins is a standard approach in treating peptic ulcer disease and chronic gastritis (StatPearls, 2023). Furthermore, the eradication of H. pylori through this mechanism is a primary strategy for preventing the progression to gastric adenocarcinoma.

Other names

H. pylori thiol-containing proteinsHelicobacter pylori sulfhydryl-containing enzymesBismuth-binding proteins of H. pylori

Bismuth ions (Bi3+) exhibit a high affinity for sulfur-containing ligands, specifically the thiol (sulfhydryl) groups of cysteine residues within various Helicobacter pylori proteins (Sun et al., 1997). By binding to these groups, bismuth displaces necessary metal ions or induces conformational changes that inactivate essential enzymes like urease, alcohol dehydrogenase, and thioredoxin reductase (Ge & Sun, 2007). This multi-targeted inhibition disrupts bacterial metabolism, cell wall integrity, and acid resistance, leading to bacterial cell death.