Bacterial and fungal cellular proteins and membranes

Silver ions (Ag+) serve as broad-spectrum antimicrobial agents by targeting a wide array of bacterial and fungal cellular components simultaneously. The primary mechanism involves the high affinity of silver ions for thiol groups found in essential enzymes and structural proteins, leading to their denaturation and loss of function (Lansdown, 2006). Additionally, silver ions associate with the microbial cell wall and cytoplasmic membrane, causing structural damage, increased permeability, and the eventual leakage of intracellular contents (StatPearls, 2023). Inside the cell, silver can also interact with nucleic acids, causing DNA to condense and inhibiting its ability to replicate and transcribe (Jung et al., 2008). Silver ions also interfere with the microbial respiratory chain by binding to enzymes like NADH dehydrogenase, effectively starving the cell of energy (Slavin et al., 2017). Due to this multi-faceted attack on proteins, membranes, and genetic material, silver is effective against a variety of pathogens, including antibiotic-resistant strains, and is commonly used in topical wound dressings and coatings for medical devices (NIH, 2022).

Other names

Microbial thiol-containing proteinsBacterial cell membraneFungal cell membraneSilver ion targetsMicrobial respiratory enzymes

Silver ions (Ag+) interact with nucleophilic groups, primarily thiol groups (-SH) in bacterial and fungal proteins, leading to protein denaturation and enzyme inactivation. They also bind to the cell membrane, causing structural damage and increased permeability, and can induce the production of reactive oxygen species (ROS) which damage DNA and other cellular components.