Microbial thiol-containing proteins

Microbial thiol-containing proteins represent a broad class of essential molecules, including enzymes and structural components, that contain reactive sulfhydryl (-SH) groups. These proteins are fundamental to microbial life, participating in critical pathways such as the tricarboxylic acid (TCA) cycle, electron transport chain, and maintaining cellular redox balance (Lemire et al., 2013, Nature Reviews Microbiology). The thiol groups are particularly susceptible to modification by electrophilic agents and heavy metal ions, which form stable mercaptides upon binding. Drugs such as silver nitrate and various mercurial antiseptics exert their antimicrobial effects by targeting these proteins, leading to protein misfolding, enzymatic inhibition, and eventual cell death (Lansdown, 2002, Journal of Wound Care). While this mechanism provides broad-spectrum activity against bacteria, fungi, and some viruses, the lack of high selectivity can lead to interactions with host proteins, posing significant safety challenges (Bernhoft, 2012, Journal of Environmental and Public Health). Consequently, these targets are most commonly exploited in topical antiseptics, wound dressings, and disinfectants rather than systemic therapeutic agents.

Other names

Microbial sulfhydryl-containing proteinsBacterial thiol proteinsThiol-dependent microbial enzymesMicrobial cysteine-containing proteins

Covalent binding or coordination with reactive sulfhydryl (-SH) groups on microbial proteins, leading to protein denaturation, inactivation of essential metabolic enzymes, and disruption of the microbial cell membrane.