Microbial metalloproteins and thiol-containing enzymes

Microbial metalloproteins and thiol-containing enzymes represent a broad class of essential proteins in bacteria, fungi, and viruses that serve as therapeutic targets for heavy metal-based antimicrobial agents. These enzymes include critical metabolic components such as urease, alcohol dehydrogenase, and various metallo-beta-lactamases, which are vital for microbial survival, virulence, and resistance to conventional antibiotics. Drugs like bismuth subsalicylate and silver-based compounds exert their effects by binding to the sulfhydryl (thiol) groups of cysteine residues or by displacing essential metal ions like zinc or nickel from the enzyme's active site. This interaction leads to the irreversible inhibition of enzymatic activity, disruption of microbial metabolism, and eventual cell death. While these targets are highly effective for treating conditions like Helicobacter pylori infections and traveler's diarrhea, their broad-spectrum nature requires careful consideration of potential host toxicity and systemic absorption.

Other names

Bacterial metalloenzymesThiol-dependent microbial enzymesMicrobial sulfhydryl-containing enzymesMetal-dependent microbial proteins

Inhibition of enzyme activity through the binding of heavy metal ions (e.g., Bi3+, Ag+) to essential thiol (sulfhydryl) groups or the displacement of native metal cofactors (e.g., Zn2+, Ni2+, Fe2+) in the active sites of microbial enzymes.