Microbial membrane and thiol-rich proteins

Microbial membrane and thiol-rich proteins represent a broad set of targets for non-specific antimicrobial agents, most notably heavy metal-based compounds like silver and mercury [1]. These targets encompass a variety of essential bacterial and fungal components, including transmembrane transporters, respiratory enzymes, and structural proteins that contain reactive cysteine residues with sulfhydryl (thiol) groups [2]. The interaction typically involves the binding of metal cations (such as silver ions) to these thiol groups, which results in the denaturation of proteins, loss of enzymatic activity, and the compromise of membrane integrity [3]. This disruption leads to the leakage of intracellular contents, inhibition of DNA replication, and the eventual death of the microorganism [2]. Because these targets are fundamental to microbial physiology and are present across many species, agents acting on them are often effective against a broad array of pathogens, including multi-drug resistant strains [1]. However, the non-specific nature of these interactions can pose challenges regarding host cell toxicity, such as interference with human wound healing processes [3]. Sources: [1] DrugBank Online, Silver Sulfadiazine (DB01015); [2] Frontiers in Microbiology, Antimicrobial Mechanisms of Silver (2018); [3] PubChem, Silver Nitrate Compound Summary.

Other names

Bacterial sulfhydryl groupsMicrobial cell envelope proteinsThiol-containing microbial enzymesBacterial membrane proteins

Covalent binding to thiol (sulfhydryl) groups causing protein denaturation, enzymatic inhibition, and microbial membrane leakage.