Bacterial surface and intracellular macromolecules

Bacterial surface and intracellular macromolecules represent a diverse set of targets for bismuth-based antimicrobial agents. These targets include the bacterial cell wall, where bismuth disrupts structural integrity, and various enzymes such as urease, which is critical for the pathogenesis of Helicobacter pylori (Yang & Sun, 2007). Bismuth ions also penetrate the cell to interact with intracellular proteins and nucleic acids, often by binding to cysteine-rich regions or competing with essential metal ions like iron and zinc (Wang et al., 2018). This multi-target approach makes bismuth complexes effective in treating gastrointestinal infections and overcoming antibiotic resistance, particularly in the context of metallo-beta-lactamase-producing bacteria (Li & Sun, 2012). Despite their long-standing use, the broad-spectrum nature of these interactions requires careful monitoring to avoid systemic toxicity, such as bismuth-induced encephalopathy (Sun et al., 2011). The target name provided is considered incorrect as it describes a drug-target interaction profile rather than a single biological entity.

Other names

Bacterial cell wall componentsBacterial enzymesUreaseMetallo-beta-lactamasesBismuth-binding proteinsThiol-containing bacterial proteins

Bismuth complexes exert antimicrobial effects by binding to various bacterial targets. They inhibit the enzyme urease, which is essential for Helicobacter pylori survival, and disrupt cell wall integrity (Sun et al., 2011). Intracellularly, bismuth ions (Bi3+) compete with other metal ions for binding sites on proteins and enzymes, particularly those containing thiol groups, leading to the inhibition of protein synthesis and DNA replication (Ge & Sun, 2007). Bismuth also inhibits metallo-beta-lactamases by displacing zinc ions, thereby restoring the activity of beta-lactam antibiotics (Wang et al., 2018).