Bacterial enzyme cysteine thiol groups

Bacterial enzyme cysteine thiol groups are critical functional moieties found within the active sites or structural domains of numerous essential bacterial proteins. These sulfhydryl (-SH) groups play pivotal roles in catalytic mechanisms, such as nucleophilic attack, and are vital for maintaining the redox balance within the bacterial cell (PubMed: 29153445). Many antimicrobial agents, including heavy metals like silver and mercury-containing compounds, exert their effects by binding to or oxidizing these thiols, thereby inactivating key metabolic enzymes (StatPearls: Antiseptics and Disinfectants). For example, the antibiotic fosfomycin specifically targets a cysteine residue in the enzyme MurA, which is essential for cell wall synthesis (PubMed: 15575386). Because cysteine thiols are ubiquitous in both bacterial and host proteins, drugs targeting these groups often face challenges regarding systemic toxicity and selectivity. Understanding the reactivity of these groups is essential for developing targeted covalent inhibitors that can distinguish between bacterial and eukaryotic enzymes.

Other names

Sulfhydryl groupsProtein thiolsCys-SH groupsCysteine residues

Covalent modification, oxidation, or coordination of the sulfhydryl group leading to enzyme inactivation and disruption of bacterial metabolism.