Helicobacter pylori thiol-containing proteins

Helicobacter pylori thiol-containing proteins are a diverse group of bacterial enzymes and structural components characterized by the presence of reactive cysteine residues. These proteins, including urease, fumarate reductase, and alcohol dehydrogenase, are vital for the bacterium's ability to survive the acidic environment of the stomach and colonize the gastric mucosa (Ge & Sun, 2007). The thiol (sulfhydryl) groups within these proteins serve as the primary molecular targets for bismuth-based therapeutic agents. Bismuth ions (Bi3+) possess a high thiophilicity, allowing them to coordinate strongly with these sulfur-containing ligands, which leads to the denaturation and functional inactivation of the proteins (Yang & Sun, 2007). This multi-target inhibition disrupts essential metabolic processes, impairs bacterial adhesion, and compromises the integrity of the bacterial cell wall (Tsang et al., 2012). Consequently, targeting these thiol-containing proteins is a highly effective strategy in the treatment of H. pylori infections and associated conditions like peptic ulcers and chronic gastritis (Hafeez et al., 2021). The broad-spectrum nature of this interaction helps prevent the development of bacterial resistance, which is a common challenge with single-target antibiotics. Clinical use of drugs targeting these proteins is often part of a quadruple therapy regimen to ensure high eradication rates.

Other names

H. pylori sulfhydryl-containing proteinsBismuth-binding proteins in H. pyloriThiol-dependent enzymes of H. pylori

Bismuth ions (Bi3+) exhibit a high affinity for sulfhydryl (thiol) groups on bacterial proteins. Binding to these groups leads to the inactivation of essential enzymes such as urease, disruption of cytoplasmic membrane integrity, and inhibition of protein and cell wall synthesis, ultimately resulting in bacterial cell death (Ge & Sun, 2007; Tsang et al., 2012).