General cellular thiol groups (R-SH)

General cellular thiol groups, primarily represented by the tripeptide glutathione (GSH) and cysteine residues within proteins, constitute the fundamental redox buffer of the cell (Source: PMCID: PMC3549305). These sulfhydryl-containing molecules are essential for maintaining cellular homeostasis by scavenging reactive oxygen and nitrogen species, thereby protecting DNA, lipids, and proteins from oxidative damage (Source: PMCID: PMC2696075). Beyond their protective role, thiols are involved in critical biological processes such as protein folding via disulfide bond formation and the regulation of signaling pathways through reversible modifications like S-glutathionylation. In clinical practice, these groups are targeted by drugs like N-acetylcysteine to replenish antioxidant stores during oxidative stress or acetaminophen overdose (Source: StatPearls, N-Acetylcysteine). Conversely, certain chemotherapeutics and heavy metals exert toxicity by depleting or binding to these thiol groups, leading to cellular dysfunction or apoptosis (Source: PMCID: PMC3146111). Because thiols are ubiquitous across all cell types, therapeutic strategies involving them must carefully balance the restoration of redox balance against the risk of non-specific off-target effects.

Other names

Sulfhydryl groupsMercaptansProtein thiolsNon-protein thiolsCellular sulfhydrylsThiol pool

Drugs interact with cellular thiols through redox-mediated scavenging of reactive species, covalent modification (alkylation), or coordination with metal ions to modulate cellular antioxidant capacity or neutralize toxins (Source: StatPearls, N-Acetylcysteine; PMCID: PMC3549305).