Cysteine-containing thiol compound

Cysteine-containing thiol compounds are a chemically and functionally diverse group of molecules featuring a sulfhydryl (–SH) group attached to a cysteine or cysteine-derived backbone. These compounds—including cysteine itself, glutathione, coenzyme A, and penicillamine—play essential roles in biological systems, acting as antioxidants, cofactors, and contributors to protein structure via disulfide bond formation[1][3][4][8]. The thiol group is highly nucleophilic and easily oxidized, making these compounds critical for maintaining cellular redox balance and protecting against oxidative stress[1][5][9]. They participate in detoxification, metal ion homeostasis, and enzymatic catalysis. Disruption or depletion of cysteine-containing thiols is associated with various diseases, including neurodegenerative disorders and cancer[1][3]. Several drugs act on or are mimics of these thiol compounds, notably N-acetylcysteine (for acetaminophen overdose and mucolysis) and penicillamine (for chelation therapy)[1][2]. However, "cysteine-containing thiol compounds" is not a single molecular target but an umbrella term for a class of chemically related molecules, so it does not correspond to a unified protein, receptor, or enzyme. Rather, it denotes a structural motif present in many different molecules with wide-ranging, often interrelated biological activities[2][3][4][8].

Other names

Cysteine thiolsLow-molecular-mass thiolsLMM thiolsSulfhydryl compoundsMercaptans

Redox modulation/antioxidant effect; Heavy metal chelation; Disulfide bond disruption; Free radical scavenging