Bacterial thiol-containing proteins

Bacterial thiol-containing proteins are a diverse group of molecules characterized by the presence of reactive sulfhydryl (-SH) groups, primarily located on cysteine residues. These proteins are fundamental to bacterial physiology, serving critical roles in maintaining redox homeostasis, facilitating enzymatic catalysis in metabolic pathways, and ensuring proper protein folding through disulfide bond formation (Fahey, 2013). In the context of infectious diseases, these proteins are essential for bacterial survival and the ability to withstand oxidative stress imposed by the host immune system. Many antimicrobial agents, including heavy metal ions like silver and organomercurials, exert their bactericidal effects by binding to these thiols, which causes widespread protein dysfunction and metabolic collapse (Lemire et al., 2013). Modern drug discovery also explores more selective inhibitors, such as auranofin, which targets specific thiol-dependent enzymes like thioredoxin reductase to treat multi-drug resistant infections (Harbut et al., 2015). Despite their efficacy, the primary challenge in targeting these proteins is achieving selectivity over human thiol-containing proteins to minimize systemic toxicity.

Other names

Bacterial sulfhydryl-containing proteinsBacterial protein thiolsBacterial cysteine-containing proteins

Antimicrobial agents targeting these proteins typically act through covalent modification, S-nitrosylation, or coordination with the sulfhydryl (-SH) group of cysteine residues. This interaction leads to the irreversible inhibition of essential enzymatic activities, disruption of cellular redox balance, and the denaturation of structural proteins, ultimately resulting in bacterial cell death (Lemire et al., 2013; Harbut et al., 2015).